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Edge defect analysis of high-strength corrosion-resistant steel
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作者 DING Chen LIU Junliang +1 位作者 WANG Wei LIU Gang 《Baosteel Technical Research》 CAS 2015年第3期23-28,共6页
In this study, a 600 MPa hot-rolled corrosion-resistant steel plate produced by a specific company is investigated. Edge jagged defects and edge surface defects generated on both sides of the strip during production a... In this study, a 600 MPa hot-rolled corrosion-resistant steel plate produced by a specific company is investigated. Edge jagged defects and edge surface defects generated on both sides of the strip during production are characterized and analyzed. The results indicate that the distribution of reoxidation granules is located underneath the surface peel and that copper-containing granules diffuse along austenite grain boundaries. This phenomenon combined with the chemical composition and production parameters of a strip indicate that copper brittleness leads to edge jagged defects. However,the surface defects should be attributed to inherent defects on the surface of the strip. Measures that prevent surface oxidation and copper segregation at grain boundaries would likely eliminate these two types of edge defects. 展开更多
关键词 edge defect high-strength steel corrosion-resistant steel copper brittleness
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Effects of chromium on the corrosion and electrochemical behaviors of ultra high strength steels 被引量:13
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作者 Jin-yan Zhong Min Sun +2 位作者 Da-bo Liu Xiao-gang Li Tian-qi Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2010年第3期282-289,共8页
The effects of chromium on the corrosion and the electrochemical behaviors of ultra high strength steels were studied by the salt spray test and electrochemical methods. The results show that ultra high strength steel... The effects of chromium on the corrosion and the electrochemical behaviors of ultra high strength steels were studied by the salt spray test and electrochemical methods. The results show that ultra high strength steels remain martensite structures and have anodic dissolution characteristic with an increase of chromium content. There is no typical passive region on the polarization curves of an ultra high strength stainless steel, AerMet 100 steel, and 300M steel. However, chromium improves the corrosion resistance of the stainless steel remarkably. It has the slowest corrosion rate in the salt spray test, one order of magnitude less than that of AerMet 100 and 300M steels. With the increase of chromium content, the polarization resistance becomes larger, the corrosion potential shifts towards the positive direction with a value of 545 mV, and the corrosion current density decreases in electrochemical measures in 3.5wt% NaCl solutions. Because of the higher content of chromium, the ultra high strength stainless steel has a better corrosion resistance than AerMet 100 and 300M steels. 展开更多
关键词 ultra high strength steel corrosion rate CHROMIUM electrochemical behavior
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Effect of microstructure on corrosion behavior of high strength martensite steel-A literature review 被引量:10
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作者 Li Wang Chao-fang Dong +3 位作者 Cheng Man Ya-bo Hu Qiang Yu Xiao-gang Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第5期754-773,共20页
The high strength martensite steels are widely used in aerospace,ocean engineering,etc.,due to their high strength,good ductility and acceptable corrosion resistance.This paper provides a review for the influence of m... The high strength martensite steels are widely used in aerospace,ocean engineering,etc.,due to their high strength,good ductility and acceptable corrosion resistance.This paper provides a review for the influence of microstructure on corrosion behavior of high strength martensite steels.Pitting is the most common corrosion type of high strength stainless steels,which always occurs at weak area of passive film such as inclusions,carbide/intermetallic interfaces.Meanwhile,the chromium carbide precipitations in the martensitic lath/prior austenite boundaries always result in intergranular corrosion.The precipitation,dislocation and grain/lath boundary are also used as crack nucleation and hydrogen traps,leading to hydrogen embrittlement and stress corrosion cracking for high strength martensite steels.Yet,the retained/reversed austenite has beneficial effects on the corrosion resistance and could reduce the sensitivity of stress corrosion cracking for high strength martensite steels.Finally,the corrosion mechanisms of additive manufacturing high strength steels and the ideas for designing new high strength martensite steel are explored. 展开更多
关键词 corrosion behavior high strength martensite steel MICROSTRUCTURE additive manufacturing
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Corrosion behavior of high-strength spring steel for high-speed railway 被引量:5
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作者 Gang Niu Yin-li Chen +2 位作者 Hui-bin Wu Xuan Wang Di Tang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第5期527-535,共9页
The corrosion resistance and evolution of corrosion products in medium-carbon high-strength spring steels were investigated in a neutral salt spray(5 wt% Na Cl solution). A formation model of γ-Fe OOH and a transform... The corrosion resistance and evolution of corrosion products in medium-carbon high-strength spring steels were investigated in a neutral salt spray(5 wt% Na Cl solution). A formation model of γ-Fe OOH and a transformation model describing the conversion of γ-Fe OOH to α-Fe OOH were constructed. The results indicated that, at the initial corrosion stage, the corrosion resistance was gradually improved with the addition of Cr; however, with the addition of alloying element V, the corrosion resistance decreased. These results were attributed mainly to the initial corrosion stage being closely related to the matrix microstructure parameters such as grain-boundary character and dislocation density. After the rust layer was formed at a later corrosion stage, the corrosion resistance was reinforced with the addition of Cr and V because Cr strongly influenced the composition, structure, and morphology of the corrosion products. The results presented herein show that Cr was conducive to the transformation of γ-Fe OOH into α-Fe OOH. Moreover, V and Cr exhibited obvious synergy and were enriched in the inner layer of the corrosion products. 展开更多
关键词 high-strength spring steel corrosion resistance ALLOYING elements RUST LAYERS evolution model
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Manifestations in Corrosion Prophase of Ultra-high Strength Steel 30CrMnSiNi2 A in Sodium Chloride Solutions 被引量:5
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作者 刘建华 WEN Chen +2 位作者 YU Mei LI Songmei WANG Ruiyang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第2期367-373,共7页
The corrosion behaviors of ultra-high strength steel 30CrMnSiNi2A in sodium chloride solution were studied by weight loss and electrochemical methods. The morphology of corrosion products was observed using scanning e... The corrosion behaviors of ultra-high strength steel 30CrMnSiNi2A in sodium chloride solution were studied by weight loss and electrochemical methods. The morphology of corrosion products was observed using scanning electron microscopy(SEM) and the composition was analyzed using an energy dispersive spectroscopy(EDS) and X-Ray diffraction (XRD). The experimental results showed that the corrosion came from pitting corrosion and the rust layer was composed of outer rust layer γ-FeOOH and inner rust layer Fe_2O_3 with a little β-FeOOH. The correlation between corrosion rate and test time accorded with exponential rule. The corrosion current measured by polarization methods was higher than that calculated by weight loss method after a long-time immersion, the main reason was that,β-FeOOH and γ-Fe_2O_3 transformed by γ-FeOOH led to overestimating corrosion rate. The processes of corrosion prophase were obtained from XRD and EIS results. The corrosion product, Fe(OH)_2 formed at the initial stage stayed at a non-steady state and then consequently transferred to γ-FeOOH, γ-Fe_2O_3 or β-FeOOH. 展开更多
关键词 30CRMNSINI2A ultra-high strength steel sodium chloride corrosion prophase
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Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution 被引量:3
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作者 Yu-bing Guo Chong Li +4 位作者 Yong-chang Liu Li-ming Yu Zong-qing Ma Chen-xi Liu Hui-jun Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第6期604-612,共9页
The effect of microstructure variation on the corrosion behavior of high-strength low-alloy(HSLA) steel was investigated. The protective property of the corrosion product layer was also explored. Experimental result... The effect of microstructure variation on the corrosion behavior of high-strength low-alloy(HSLA) steel was investigated. The protective property of the corrosion product layer was also explored. Experimental results reveal that the type of microstructure has significant effect on the corrosion resistance of HSLA steel. The measurement results of weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy indicate that the steel with acicular ferrite microstructure exhibits the lowest corrosion rate. Martensite exhibits a reduced corrosion resistance compared with polygonal ferrite. It is found that the surface of the acicular ferrite specimen uniformly covered by corrosion products is seemingly denser and more compact than those of the other two microstructures, and can provide some amount of protection to the steel; thus, the charge transfer resistance and modulus values of the acicular ferrite specimen are the largest. However, corrosion products on martensite and polygonal ferrite are generally loose, porous, and defective, and can provide minor protectiveness; thus, the charge transfer resistance values for polygonal ferrite and martensite are lower. 展开更多
关键词 high-strength low-alloy steel microstructure corrosion sodium chloride solutions
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Corrosion Behavior of Ultra-high Strength Steel 300M in Different Simulated Marine Environments 被引量:1
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作者 郭强 刘建华 +1 位作者 yu mei li songmei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第2期372-378,共7页
Corrosion behavior of 300M in neutralcorrosion environments containing Na Clsimulated by totalimmersion(TI),salt spraying(SS)and periodic immersion(PI),was investigated by surface analysis techniques,corrosion w... Corrosion behavior of 300M in neutralcorrosion environments containing Na Clsimulated by totalimmersion(TI),salt spraying(SS)and periodic immersion(PI),was investigated by surface analysis techniques,corrosion weight-loss method,and electrochemicalmeasurements.In totalimmersion environment,rust on the steelconsisted of a porous outer rust layer with main constituent of γ-Fe OOH,and an inner rust layer of dense Fe_3O_4 film with network broad cracks.In salt spraying environment,outer rust with main composition of γ-Fe OOH/α-Fe OOH/Fe_3O_4 was compact,and inner rust showed dense Fe_3O_4 film.Rust formed by periodic immersion exhibited a compact outer rust layer with constituent of α-Fe OOH/γ-Fe OOH/Fe_3O_4 and an inner rust layer with composition of α-Fe OOH/α-Fe_2O_3;inner rust showed a ultra-dense film adherent to the steel.The corrosion rate showed a rule of vss(salt spraying)〉vti(totalimmersion)〉〉vpi(periodic immersion)in 0-240 h,and vss≈vti?vpiin 240-720 h.The rust formed by periodic immersion was dense and compact,with stable electrochemicalproperties,and had excellent protection on the steel.Humidity and oxygen concentration in allthe environments played major roles in rust formation. 展开更多
关键词 ultra-high strength steel corrosion simulated corrosion environments chloride
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Threshold Stress Intensity of Hydrogen-Induced Cracking and Stress Corrosion Cracking of High Strength Steel
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作者 LI Hui-lu GAO Ke-wei +5 位作者 QIAO Li-jie WANG Yan-bing CHU Wu-yang HUI Wei-jun DONG Han WENG Yu-qing 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2001年第2期42-46,共5页
The threshold stress intensity of stress corrosion cracking(SCC) for 40 CrMo steel in 3.5%NaCl solution decreased exponentially with the increase of yield strength.The threshold stress intensity of hydrogen-induced cr... The threshold stress intensity of stress corrosion cracking(SCC) for 40 CrMo steel in 3.5%NaCl solution decreased exponentially with the increase of yield strength.The threshold stress intensity of hydrogen-induced cracking during dynamical charging for 40 CrMo steel decreased linearly with the logarithm of the concentration of diffusible hydrogen.This equation was also applicable to SCC of high strength steel in aqueous solution.The critical hydrogen enrichment concentration necessary for SCC of high strength steel in water decreased exponentially with the increase of yield strength.Based on the results,the relationship between K_(ISCC) and σ_(ys) could be deduced. 展开更多
关键词 high strength steel stress corrosion hydrogen-induced cracking
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IMPROVEMENT ON SUSCEPTIBILITY OF ULTAR-HIGH STRENGTH STEEL TO STRESS CORROSION CRACKING BY HIGH TEMPERATURE QUENCHING
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作者 LI Guangfu WU Rengen Harbin Institute of Technology,Harbin,China LI Guangfu Division of Metallography,Harbin Institute of Technology,Harbin 150006,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1990年第3期213-217,共5页
The effect of quenching temperature on the stress corrosion cracking of 30Cr3SiNiMoV ultra-high strength steel in 3.5% NaCl aqueous solution has been studied.The threshold K_(ISCC) may continuously increase with the q... The effect of quenching temperature on the stress corrosion cracking of 30Cr3SiNiMoV ultra-high strength steel in 3.5% NaCl aqueous solution has been studied.The threshold K_(ISCC) may continuously increase with the quenching temperature raised from 870 to 1200℃ . All of the fractures are intergranular.The analyses of the segregation along prior austenitic grain boundaries,grain size and other microstructural factors reveal that the inerease of K_(ISCC) is mainly due to the coarsening of prior austenitic grains. 展开更多
关键词 ultra-high strength steel stress corrosion cracking grain boundary segregation
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Fabrication of high nitrogen austenitic stainless steels with excellent mechanical and pitting corrosion properties 被引量:11
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作者 Hua-bing Li Zhou-hua Jiang Yang Cao Zu-rui Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第4期387-392,共6页
A series of high nitrogen austenitic stainless steels were successfully developed with a pressurized electroslag remelting furnace. Nitride additives and deoxidizer were packed into the stainless steel pipes, and then... A series of high nitrogen austenitic stainless steels were successfully developed with a pressurized electroslag remelting furnace. Nitride additives and deoxidizer were packed into the stainless steel pipes, and then the stainless steel pipes were welded on the surface of an electrode with low nitrogen content to prepare a compound electrode. Using Si3N4 as a nitrogen alloying source, the silicon contents in the ingots were prone to be out of the specification range, the electric current fluctuated greatly and the surface qualities of the ingots were poor. The surface qualities of the ingots were improved with FeCrN as a nitrogen alloying source. The sound and compact macrostructure ingot with the maximum nitrogen content of 1.21wt% can be obtained. The 18Cr18Mn2Mo0.9N high nitrogen austenitic stainless steel exhibits high strength and good ductility at room temperature. The steel shows typical ductile-brittle transition behavior and excellent pitting corrosion resistance properties. 展开更多
关键词 high nitrogen austenitic stainless steels electroslag remelting nitrogen alloying ductile-brittle transition pitting corrosion resistance
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Development of a New Kind of High Strength Spring Steel 被引量:3
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作者 DexiangXU ZhongdaYIN DefuLIU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第5期557-560,共4页
A new kind of high strength, high toughness and high plasticity spring steel has been developed. The strength, the reduction of area and the elongation of the steel are all higher than those of the steel 60Si2CrVA. Th... A new kind of high strength, high toughness and high plasticity spring steel has been developed. The strength, the reduction of area and the elongation of the steel are all higher than those of the steel 60Si2CrVA. The decarburization resistance and the sag resistance are also higher than those of the steel 60Si2CrVA. It has good hardenability, and is suitable for making springs with big cross section. The bogie springs made of this kind of steel have passed 2×106 cycles without broken under the conditions of maximum stress of 906 MPa and the minimum stress of 388 MPa. 展开更多
关键词 Spring steel high strength TOUGHNESS PLASTICITY Sag resistance HARDENABILITY Fatigue
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Corrosion resistance evaluation of highly dispersed MgO–MgAl2O4–ZrO2 composite and analysis of its corrosion mechanism: A chromium-free refractory for RH refining kilns 被引量:3
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作者 Yi-nan Shen Yi Xing +4 位作者 Peng Jiang Yong Li Wen-dong Xue Guo-xiang Yin Xue-qin Hong 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第8期1038-1046,共9页
The corrosion resistance behavior of a highly dispersed MgO-MgAl2O4-ZrO2 composite refractory material is examined by testing with high-basicity and low-basicity RH(Ruhrstahl-Hereaeus)slags.The composite material exhi... The corrosion resistance behavior of a highly dispersed MgO-MgAl2O4-ZrO2 composite refractory material is examined by testing with high-basicity and low-basicity RH(Ruhrstahl-Hereaeus)slags.The composite material exhibits greater resistance to the RH slags than the traditional MgO-Cr2O3 composite,MgO-ZrO2 composite,and MgO-MgAl2O4-ZrO2 composite.On the basis of the microstructural analysis and mechanisms calculations,the corrosion resistance behavior of the MgO-MgAl2O4-ZrO2 composite is attributable to its highly dispersed structure,which helps protect the high activity of ZrO2.When in contact with the slag,ZrO2 reacts with CaO to form the stable phase CaZrO3,which protects MgAl2O4 against corrosion,thereby enhancing the corrosion resistance of the composite. 展开更多
关键词 highLY dispersed MgO-MgAl2O4-ZrO2 COMPOSITE material RH refining chrome-free refractory slag corrosion resistance
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1300 MPa High Strength Steel for Bolt with Superior Delayed Fracture Resistance 被引量:2
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作者 HUI Wei-jun DONG Han +2 位作者 WENG Yu-qing CHEN Si-lian WANG Mao-qiu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2002年第1期40-45,共6页
By the increase in Mo content,the addition of microalloying elements V and Nb and by reducing the contents of Mn,P and S based on the composition of steel 42 CrMo,we have developed a 1 300 MPa-grade high strength stee... By the increase in Mo content,the addition of microalloying elements V and Nb and by reducing the contents of Mn,P and S based on the composition of steel 42 CrMo,we have developed a 1 300 MPa-grade high strength steel(ADF1)for bolts.The sustained load bending test,sustained load tensile test and stress corrosion cracking test have been carried out to evaluate the delayed fracture resistance of steel ADFl and commercial steel 42 CrMo.The results showed that steel ADF1 has superior delayed fracture resistance to that of 42 CrMo steel.It's concluded that the superior delayed fracture resistance of ADF1 is mainly due to the increase of tempering temperature,fine homogeneously distributed MC carbide and fine prior austenite grain size. 展开更多
关键词 high strength steel bolt steel delayed fracture hydrogen embrittlement stress corrosion
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Effect of Boron on Delayed Fracture Resistance of Medium-Carbon High Strength Spring Steel 被引量:2
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作者 NIE Yi-hong HUI Wei-jun +1 位作者 FU Wan-tang WENG Yu-qing 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2007年第6期53-57,67,共6页
The delayed fracture behavior of medium carbon high strength spring steel containing different amounts of boron (0. 000 5%, 0. 001 6 %) was studied using sustained load delayed fracture test. The results show that d... The delayed fracture behavior of medium carbon high strength spring steel containing different amounts of boron (0. 000 5%, 0. 001 6 %) was studied using sustained load delayed fracture test. The results show that delayed fracture resistance of boron containing steels is higher than that of conventional steel 60Si2MnA at the same strength level and it increases with the increase of boron eontent from 0. 000 5% to 0. 001 6%. The delayed fracture mode is mainly intergranular in the boron containing steels tempered at 350℃, which indicates that the addition of boron does not change the fracture character. However, the increase of boron content enlarges the size of the crack initia tion area. Further study of phase analysis indicates that most boron is in solid solution, and only a very small quantity of boron is in the M3 (C, B) phase. 展开更多
关键词 borons delayed fracture resistances medium-carbon high strength spring steel
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Microstructure and mechanical property of resistance spot welded joint of aluminum alloy to high strength steel with especial electrodes 被引量:2
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作者 张伟华 孙大千 +3 位作者 殷世强 韩立军 高阳 邱小明 《China Welding》 EI CAS 2011年第2期1-6,共6页
Dissimilar material joining of 6008 aluminum alloy to H220 YD galvanized high strength steel was performed by resistance spot welding with especial electrodes that were a flat tip electrode against the steel surface a... Dissimilar material joining of 6008 aluminum alloy to H220 YD galvanized high strength steel was performed by resistance spot welding with especial electrodes that were a flat tip electrode against the steel surface and a domed tip electrode upon the aluminum alloy surface. An intermetallic compound layer composed of Fe2Al5 and FeAl3 was formed at the steel/ aluminum interface in the welded joint. The thickness of the intermetallic compound layer increased with increasing welding current and welding time, and the maximum thickness being 7. 0 μm was obtained at 25 kA and 300 ms. The weld nugget diameter and tensile shear load of the welded joint had increased tendencies first with increasing welding current ( 18 -22 kA) and welding time ( 50 - 300 ms), then changed little with further increasing welding current ( 22 - 25 kA) and welding time (300 -400 ms). The maximum tensile shear load reached 5.4 kN at 22 kA and 300 ms. The welded joint fractured through brittle intermetallic compound layer and aluminum alloy nugget. 展开更多
关键词 aluminum alloy high strength steel resistance spot welded joint microstructure mechanical property
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Effect of cold working and sandblasting on the microhardness, tensile strength and corrosion resistance of AISI 316L stainless steel 被引量:1
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作者 Suyitno Budi Arifvianto +3 位作者 Teguh Dwi Widodo Muslim Mahardika Punto Dewo Urip Agus Salim 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第12期1093-1099,共7页
The aim of this work is to investigate the effect of cold working and sandblasting on the microhardness, tensile strength and corro-sion rate of AISI 316L stainless steel. The specimens were deformed from 17% to 47% a... The aim of this work is to investigate the effect of cold working and sandblasting on the microhardness, tensile strength and corro-sion rate of AISI 316L stainless steel. The specimens were deformed from 17% to 47% and sandblasted for 20 min using SiC particles with a diameter of 500-700 μm and an air flow with 0.6-0.7 MPa pressure. The microhardness distribution and tensile test were conducted and a measurement on the corrosion current density was done to determine the corrosion rate of the specimens. The result shows that the cold working enhances the bulk microhardness, tensile and yield strength of the specimen by the degree of deformation applied in the treatment. The sandblasting treatment increases the microhardness only at the surface of the specimen without or with a low degree of deformation. In addition, the sandblasting enhances the surface roughness. The corrosion resistance is improved by cold working, especially for the highly deformed specimen. However the follow-up sandblasting treatment reduces the corrosion resistance. In conclusion, the cold working is prominent to be used for improving the mechanical properties and corrosion resistance of AISI 316L stainless steel. Meanwhile, the sandblasting subjected to the cold worked steel is only useful for surface texturing instead of improving the mechanical properties and corrosion resistance. 展开更多
关键词 stainless steel cold working SANDBLASTING MICROHARDNESS tensile strength corrosion resistance
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Prediction and Verification of Resistance Spot Welding Results of Ultra-High Strength Steels through FE Simulations 被引量:2
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作者 Oscar Andersson Arne Melander 《Modeling and Numerical Simulation of Material Science》 2015年第1期26-37,共12页
Resistance spot welding (RSW) is the most common welding method in automotive engineering due to its low cost and high ability of automation. However, physical weldability testing is costly, time consuming and depende... Resistance spot welding (RSW) is the most common welding method in automotive engineering due to its low cost and high ability of automation. However, physical weldability testing is costly, time consuming and dependent of supplies of material and equipment. Finite Element (FE) simulations have been utilized to understand, verify and optimize manufacturing processes more efficiently. The present work aims to verify the capability of FE models for the RSW process by comparing simulation results to physical experiments for materials used in automotive production, with yield strengths from approximately 280 MPa to more than 1500 MPa. Previous research has mainly focused on lower strength materials. The physical weld results were assessed using destructive testing and an analysis of expulsion limits was also carried out. Extensive new determination of material data was carried out. The material data analysis was based on physical testing of material specimens, material simulation and comparison to data from literature. The study showed good agreement between simulations and physical testing. The mean absolute error of weld nugget size was 0.68 mm and the mean absolute error of expulsion limit was 1.10 kA. 展开更多
关键词 Resistance SPOT WELDING FE Simulations high strength steel Material Modeling WELD SIZE
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Effects of tungsten on the oxidation resistance and high-temperature strength of 18CrNbTi ferritic stainless steel
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作者 LI Xin BI Hongyun CHEN Liqing 《Baosteel Technical Research》 CAS 2016年第4期41-45,共5页
18CrNbTi ferritic stainless steel is a low-cost material mainly used for the fabrication of manifolds, which usually work at temperatures below 950℃. With the development of engine technology, exhaust manifolds tend ... 18CrNbTi ferritic stainless steel is a low-cost material mainly used for the fabrication of manifolds, which usually work at temperatures below 950℃. With the development of engine technology, exhaust manifolds tend to work above 1 000 ℃ and this may be even higher in the future. For developing a new kind of steel to satisfy these requirements,the effects of tungsten (W)addition on the high-temperature strength and oxidation resistance of 18CrNbTi ferritic stainless steel are discussed in this study. The test results show that W enhances high-temperature strength at 1 000 ℃ and significantly improves oxidation resistance. However, W addition tends to degrade oxide layer adhesion,causing spalling during alternate hot and cold conditions. 展开更多
关键词 ferritic stainless steel high temperature strength oxidation resistance exhaust manifold
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Microstructure evolution and corrosion resistance in simulated CGHAZ of X80 high-deformability pipeline steel
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作者 赵伟 邹勇 +1 位作者 邹增大 夏佃秀 《China Welding》 EI CAS 2015年第4期39-45,共7页
In this study, the microstructure evolution and corrosion resistance in O. 5 M Na2CO3 - 1 M NaHCO3 solution of X80 high-deformability ( X8OHD ) pipeline steel coarse-grained heat-affected zone (CGHAZ) with several... In this study, the microstructure evolution and corrosion resistance in O. 5 M Na2CO3 - 1 M NaHCO3 solution of X80 high-deformability ( X8OHD ) pipeline steel coarse-grained heat-affected zone (CGHAZ) with several heat input levels were investigated. It is shown that the microstructure of CGHAZ changes from bainite ferrite to granular bainite as the heat input increasing. In addition, the corrosion resistance and the stability of passive film of base material are better than those of CGHAZ with several heat input levels. Too small or too big heat input is inadvisable and better corrosion resistance of CGHAZ is attained when heat input is 30 kJ/cm. 展开更多
关键词 X80HD pipeline steel coarse-grained heat-affected zone (CGHAZ) corrosion resistance high-pH solution
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Improvement of the Corrosion Resistance of High Alloyed Austenitic Cr-Ni-Mo Stainless Steels by Solution Nitriding
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作者 Christine Eckstein Heinz- Joachim Spies Jochen Albrecht 《材料热处理学报》 EI CAS CSCD 北大核心 2004年第5期316-321,共6页
Characteristic features of austenitic steel grades combine a good corrosion resistance with a low hardness, wear resistance and scratch resistance. An interesting possibility for improving the wear behaviour of these ... Characteristic features of austenitic steel grades combine a good corrosion resistance with a low hardness, wear resistance and scratch resistance. An interesting possibility for improving the wear behaviour of these steels without loss of their corrosion resistance lies in enriching the near surface region with nitrogen. The process of a solution nitriding allows the rise of the solution of nitrogen in the solid phase. On this state nitrogen increases the corrosion resistance and the tribilogical load-bearing capacity. The aim of the study was, to investigate the improvement of the pitting corrosion behaviour by solution nitriding. A special topic was to observe the effect of nitrogen by different molybdenum content. So austenitic stainless steels (18% Cr, 12% Ni, Mo gradation between 0.06 to 3.6%) had been solution nitrided. The samples could be prepared with various surface content of nitrogen from 0.04 to 0.45% with a step-by-step grinding. The susceptibility against pitting corrosion of these samples had been tested by determination of the stable pitting potential in 0.5M and 1M NaCl at 25°C. For the investigated steel composition and the used corrosion system there is no influence of molybdenum on the effectiveness of nitrogen. The influence of nitrogen to all of the determined parameters can be described well by PRE = Cr + 3,3 * Mo + 25 *N. XPS analysis of the sample surfaces support the results of the pitting corrosion tests.Additionally surface investigations with an acid elektolyte (0,1M HC1 + 0,4M NaCl) were performed. In this case the passivation effective nitrogen content increases markedly with rising molybdenum concentration of the steel. Obviously an interaction of Mo and N is connected with a strongly acid electrolyte. 展开更多
关键词 耐蚀性 奥氏体不锈钢 CR-NI-MO 渗氮 PRE 稳定点蚀电位
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