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Hydrogen induced cracking of X80 pipeline steel 被引量:7
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作者 Chao-fang Dong Kui Xiao Zhi-yong Liu Wen-jing Yang Xiao-gang Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2010年第5期579-586,共8页
The hydrogen-induced cracking (HIC) behavior of X80 pipeline steel was studied by means of electrochemical charging, hydrogen permeation tests, tension test, and scanning electron microscopy (SEM). The experimenta... The hydrogen-induced cracking (HIC) behavior of X80 pipeline steel was studied by means of electrochemical charging, hydrogen permeation tests, tension test, and scanning electron microscopy (SEM). The experimental results indicate that the increase of charging time and charging current density or the decrease of the solution pH value leads to an increase of the hydrogen content in X80 steel, which plays a key role in the initiation and propagation of HIC. It is found that the majority of macro-inclusions within the as-used X80 steel do not constitute a direct threat to HIC except aluminum oxides, which directly or indirectly lead to HIC. The hydrogen trap density at room temperature is estimated to be pretty high, and this is an essential reason why the steel is sensitive to HIC. After hydrogen charging, the elongation loss rate and area reduction of X80 steel decline obviously, taking a noticeable sign of hydrogen-induced plasticity damages. It is demonstrated that the losses of these plastic parameters have a linear relation to the fracture size due to hydrogen. 展开更多
关键词 pipeline steel hydrogen induced cracking electrochemical charging FRACTURE
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TEM Study on Hydrogen-Induced Cracking of Fe_3Al Alloy 被引量:2
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作者 Biao Gu, Lijie Qiao, Wuyang Chu Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 《Journal of University of Science and Technology Beijing》 CSCD 2001年第1期35-38,共4页
Hydrogen-induced cracking (HIC) of Fe3Al alloy was studied by in situ transmission electron microscope (TEM). Electron transparent specimens were mounted onto a constant displacement device. Stress was applied to the ... Hydrogen-induced cracking (HIC) of Fe3Al alloy was studied by in situ transmission electron microscope (TEM). Electron transparent specimens were mounted onto a constant displacement device. Stress was applied to the specimen by using a bolt through the device. The results showed that hydrogen enhanced the dislocation emission and motion in Fe3Al alloy. A dislocation free zone (DFZ) was formed following the dislocation emission. Microcrack initiated in the DFZ or at the main crack tip when the emission reached a critical extension. Hydrogen played an important role in the process of brittle fracture of Fe3Al alloy. 展开更多
关键词 TEM Fe3Al intermetallics hydrogen induced cracking dislocation emission dislocation free zone
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Influence of S Contents on the Hydrogen Blistering and Hydrogen Induced Cracking of A350LF2 Steel 被引量:4
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作者 Shu-qi Zheng Chang-feng Chen Li-qiang Chen 《Materials Sciences and Applications》 2011年第7期917-921,共5页
In the present work, the effects of chemical compositions on the hydrogen blistering and hydrogen induced cracking of A350LF2 steel with different S contents were studied. Four types of A350LF2 steels were evaluated b... In the present work, the effects of chemical compositions on the hydrogen blistering and hydrogen induced cracking of A350LF2 steel with different S contents were studied. Four types of A350LF2 steels were evaluated by immersing samples in H2S-saturated NACE solution. The hydrogen blistering, crack length rate(CLR), crack thickness rate(CTR) and crack sensitivity rate(CSR) were evaluated. The results show that there are many hydrogen blisters on the sample surface with S content of 0.021%, a few on the sample surface with S content of 0.019% and 0.012% and no one on the surface with S content of 0.002%. There were 12, 2 and 1 strips of cracks of longer than 0.3 mm on the evaluated cross sections with S content of 0.021%, 0.019% and 0.012%, respectively. There was no any crack in the sample with 0.002% S. The corrosion rate was also evaluated. The S content has no obvious influence on the corrosion rate. 展开更多
关键词 A350LF2 S CONTENT hydrogen BLISTERING hydrogen induced cracking
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Hydrogen-induced cracking behaviors of Incoloy alloy 825 被引量:2
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作者 Yong-jin Yang Ke-wei Gao Chang-feng Chen 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2010年第1期58-62,共5页
The effect of hydrogen on the fractttre behaviors of Incoloy alloy 825 was investigated by means of slow strain rate testing (SSRT) Hydrogen was introduced into the sample by electrochemical charging. The results sh... The effect of hydrogen on the fractttre behaviors of Incoloy alloy 825 was investigated by means of slow strain rate testing (SSRT) Hydrogen was introduced into the sample by electrochemical charging. The results show that surface microcracks form gradually during ag- ing at room temperature when desorption of hydrogen takes place after hydrogen charging at a current density of 5 mA/cm^2 for 24 h. SSRT shows that the increase of ductility loss is significantly obvious as the hydrogen charging current density increases. Scanning electron microscopy (SEM) images reveal ductile fracture in the pre-charged sample with low current densities, while the fracture includes small quasi-cleavage regions and tends to be brittle fracture as the hydrogen charging current density increases to 5 mA/cm^2. 展开更多
关键词 Incoloy alloy hydrogen-induced cracking diffusible hydrogen slow strain rate testing
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Investigation on hydrogen-induced cracking susceptibility of HG980D steel with yield strength 900 MPa 被引量:1
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作者 高有进 王乘 徐宗林 《China Welding》 EI CAS 2008年第3期15-19,共5页
In this paper, the microstructure and hardness of HG980D heat-affected zone (HAZ) at different cooling rate t8/3 were studied, the implant critical fracture stress under three diffusible hydrogen conditions were mea... In this paper, the microstructure and hardness of HG980D heat-affected zone (HAZ) at different cooling rate t8/3 were studied, the implant critical fracture stress under three diffusible hydrogen conditions were measured, and the hydrogeninduced cracking (H1C) fructograph of steel HG980D were analyzed, The experimental results show that martensite exists in HAZ of HG980D till ts/3 ≥ 150 s, the harden quenching tendency of HG980D is greater; The implant critical fracture stress is related to difJhsible hydrogen content significantly, at low hydrogen level, high restraint stress is needed to nucleate HIC, the fraetograph is mainly mierovoid coalescence, bat at high hydrogen level, only small restraint stress can cause H1C occurrence, the fractograph is mainly quasicleavage. It is very important to choose ultra-low hydrogen welding consumable to weld steel HG980D to prevent hydrogen-induced cracking. 展开更多
关键词 HG980D hydrogen-induced cracking diffusible hydrogen FRACTOGRAPH
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Hydrogen-increased dezincification layer-induced stress and susceptibility to stress corrosion cracking of brass 被引量:1
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作者 李会录 高克玮 +2 位作者 褚武扬 刘亚萍 乔利杰 《中国有色金属学会会刊:英文版》 CSCD 2003年第2期353-357,共5页
Dezincification layer formed during corrosion or stress corrosion cracking (SCC) of brass in an ammonia solution could induce an additive stress. The effect of hydrogen on the dezincification layer induced stress and ... Dezincification layer formed during corrosion or stress corrosion cracking (SCC) of brass in an ammonia solution could induce an additive stress. The effect of hydrogen on the dezincification layer induced stress and the susceptibility to SCC were studied. The dezincification layer induced stress was measured using the deflection method and the flowing stress differential method, respectively. The latter measures the difference between the flowing stress of a specimen before unloading and the yield stress of the same specimen after unloading and forming a dezincification layer. The susceptibility to SCC was measured using slow strain rate test. Results show that both the dezincification layer induced stress and the susceptibility to SCC increase with increasing hydrogen concentration in a specimen. This implies that hydrogen enhanced dezincification layer induced stress is consistence with the hydrogen increased susceptibility to SCC of brass in the ammonia solution. 展开更多
关键词 黄铜 裂纹 应力腐蚀 SCC
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Relationship between Critical Hydrogen Concentration and Applied Stress for Hydrogen Induced Cracking in 0.2 wt—%C Annealed Plain Steel
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作者 张柏玉 唐祥云 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1990年第6期447-449,共3页
1.IntroductionSo far there are few people who studythe relationship between the criticalhydrogen concentration and the stress forhvdrogen induced cracking (CCHIC)quantitatively.Several researchers have cal-culated the... 1.IntroductionSo far there are few people who studythe relationship between the criticalhydrogen concentration and the stress forhvdrogen induced cracking (CCHIC)quantitatively.Several researchers have cal-culated the CCHIC of steels under no stressby means of H permeation method,but no 展开更多
关键词 hydrogen induced cracking plain steel critical hydrogen concentration STRESS
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Hydrogen-induced Cracking of Weld Metal of Austenitic Stainless Steels
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作者 ChuanPAN LijieQIAO 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2002年第4期375-377,共3页
For 308L and 347L weld metals of austenitc stainless steels (ASS), hydrogen induced cracking (HIC) occurred during dynamically charging under constant load. The threshold stress intensity for HIC, Km, decreased linear... For 308L and 347L weld metals of austenitc stainless steels (ASS), hydrogen induced cracking (HIC) occurred during dynamically charging under constant load. The threshold stress intensity for HIC, Km, decreased linearly with the logarithm of the concentration of diffusible hydrogen C0 in the weld metals and the rolled plate of type 304L ASS, i.e., KIH=85.2-10.71nC0 (308L), KIH=76.1-9.31n C0(347L), and KIH=91.7-10.11nC0(304L). The fracture mode for HIC in the three type of ASS changed from ductile to brittle with the decrease in the applied stress intensity KI or/and the increase in C0. The boundary line between ductile and brittle fracture surfaces was KI-54+25exp(-C0/153)=0. 展开更多
关键词 Austenitic stainless steel hydrogen induced cracking FRACTURE
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INFLUENCE OF GRAIN SIZE ON STRENGTH AND HYDROGEN INDUCED CRACKING OF DUPLEX STAINLESS STEELS
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作者 HE Jianhong Huazhong University of Science and Technology,Wuhan,ChinaTANG Xiangyun CHEN Nanping Tsinghua University,Beijing,China Dept.of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1991年第1期21-24,共4页
The relation between grain size and strength of the duplex stainless steels and influence of grain size on properties of hydrogen induced cracking in these steels have been investigated. The Hall-Petch relation betwee... The relation between grain size and strength of the duplex stainless steels and influence of grain size on properties of hydrogen induced cracking in these steels have been investigated. The Hall-Petch relation between grain size and strength of the steels is also followed.The susceptibility to hydrogen induced cracking of the steels increases with increasing grain size. 展开更多
关键词 duplex stainless steel hydrogen induced cracking grain size
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(Ⅰ+Ⅱ)MIXED MODE HYDROGEN INDUCED CRACKING
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作者 GAO Hua XUE Lijue Shanghai University of Engineering Science,Shanghai,China Associate Professor,Dept.of Materials,Shanghai University of Engineering Science,350 Xianxia Road,Shanghai,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第4期279-283,共5页
Hydrogen induced cracking(HIC)of 0.3% C,1% Cr,1% Mn,1% Si high strength steel has been studied under simple mode Ⅰ,mode Ⅱ and(Ⅰ+Ⅱ)mixed mode loading conditions.Af- ter being hydrogen-charged in IN H_2SO_4 solution... Hydrogen induced cracking(HIC)of 0.3% C,1% Cr,1% Mn,1% Si high strength steel has been studied under simple mode Ⅰ,mode Ⅱ and(Ⅰ+Ⅱ)mixed mode loading conditions.Af- ter being hydrogen-charged in IN H_2SO_4 solution,the material behaved hydrogen embrittlement in all the cases studied.The threshold K_(ⅡH)/K_(ⅡX) of HIC under mode Ⅱ load- ing was 0.27,which was nearly the same as that K(ⅠH)/K_(ⅠX)=0.29 under mode Ⅰ loading. While the thresholds of-HIC under(Ⅰ+Ⅱ)mixed mode loading were 0.36,0.41 and 0.37 cor- responding to the K_Ⅱ/K_Ⅰ ratio of 0.27,0.4 and O.81.The results show that simple mode Ⅰ or mode Ⅱ loading is more susceptible to hydrogen embrittlement than(Ⅰ+Ⅱ)mixed mode. For explaining the experimental results,the effects of triaxial stress as well as plastic deformation ahead of crack tip has been discussed. 展开更多
关键词 (Ⅰ+Ⅱ)mixed mode hydrogen induced cracking
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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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Fractal Dimensions of Hydrogen Induced Brittle Fracture of Titanium Aluminide
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作者 Yue ZHANG Yanbin WANG Lijie QIAO Wuyang CHU Chimei HSIAO Dept.of Materials Physics,University of Science and Technology,Beijing,Beijing,100083,China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1993年第5期338-342,共5页
The relationship between the stress intensity factor K_1~* required for brittle crack initiation and propa- gation and the fractal dimension D_F of the fracture surface was derived,i.e, InK_1~*=(1/2)In2γE'+(1/2)I... The relationship between the stress intensity factor K_1~* required for brittle crack initiation and propa- gation and the fractal dimension D_F of the fracture surface was derived,i.e, InK_1~*=(1/2)In2γE'+(1/2)In(d_f/L_0)(1-D_F) The real surface energy can be calculated based on the measured linear relation of the InK_1~* vs D_F, The equation is not only suitable for the overload fracture but also for the delayed fracture,e.g. hydrogen induced cracking (HIC) and stress corrosion cracking (SCC).The experiment results showed that the hydrogen induced delayed cracking occurred in the Ti-24AI-11 Nb alloy during dy- namic charging,and the threshold stress intensity factor was very low,i.e..K_(IH)/K_(IC)= 0.43.The ex- perimental relationship between the stress intensity factor K_1~* and D_F was consistent with the theo- retical equation. 展开更多
关键词 titanium aluminide hydrogen induced cracking tractal dimension
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Effect of crystallographic orientation on crack growth behaviour of HSLA steel 被引量:2
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作者 Endian Fan Yong Li +1 位作者 Yang You Xuewei Lü 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第8期1532-1542,共11页
In this work,the crack growth behaviours of high strength low alloy(HSLA)steel E690 with three crystallographic orientations(the rolling direction,normal direction,and transverse direction)were investigated and compar... In this work,the crack growth behaviours of high strength low alloy(HSLA)steel E690 with three crystallographic orientations(the rolling direction,normal direction,and transverse direction)were investigated and compared from the view of the mechano-electrochemical ef-fect at the crack tip.The results show that the crack growth of the HSLA steel is controlled by the corrosion fracture at the crack tip.The vari-ation of crystallographic orientation in E690 steel plate has no influence on the crack tip electrochemical reaction and crack growth mechanism,but changes the crack growth rate.When the stress loading direction is parallel to the rolling direction and the fracture layer is parallel to the transverse-normal plane,the crack growth rate is the slowest with a value of 0.0185 mm·h^(-1).When the load direction and the fracture layer are parallel to the normal direction and the rolling-transverse plane,respectively,the crack growth rate is the highest with a value of 0.0309 mm·h^(-1).This phenomenon is ascribed to the different microstructural and mechanical properties in the rolling direction,normal direction,and transverse direction of E690 steel plate. 展开更多
关键词 high strength low alloy steel crystallographic orientation microstructural characteristic crack growth mechanism hydrogen induced cracking
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Sulfide Stress Cracking Assessment of Carbon Steel Welding with High Content of H<SUB>2</SUB>S and CO<SUB>2</SUB>at High Temperature: A Case Study 被引量:1
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作者 Apolinar Albiter 《Engineering(科研)》 2020年第12期863-885,共23页
In the oil and gas industry, it has been established that for pipelines fabricated with carbon steels, their limitation is related to H<sub>2</sub>S and CO<sub>2</sub> environments, which is 7 ... In the oil and gas industry, it has been established that for pipelines fabricated with carbon steels, their limitation is related to H<sub>2</sub>S and CO<sub>2</sub> environments, which is 7 to 10 psia of partial pressure of <span style="white-space:normal;">CO</span><sub style="white-space:normal;">2</sub>. Therefore, in carbon steel cracking is shown, after 7 or 10 psia of partial pressure of <span style="white-space:normal;">CO</span><sub style="white-space:normal;">2</sub>. The experimental work was performed under static conditions in autoclaves within a pH of 3 to 3.8;partial pressures of 16 - 96 psi for H<sub>2</sub>S and 15 - 53 psi for <span style="white-space:normal;">CO</span><sub style="white-space:normal;">2</sub>, in the temperature range of 25<span style="white-space:nowrap;">&#176;</span>C - 150<span style="white-space:nowrap;">&#176;</span>C. It was observed that the average yielding stress used in Sulfide Stress Cracking (SSC) tests decreases with temperature increment. Hydrogen Induced Cracking (HIC) evaluations showed that X52 steel, under conditions, was not susceptible to HIC. Results of SSC did not show indications of cracking after exposure to sour solutions, except for the specimen exposed to high H<sub>2</sub>S and <span style="white-space:normal;">CO</span><sub style="white-space:normal;">2</sub> content (96 psi of H<sub>2</sub>S and 53 psi of <span style="white-space:normal;">CO</span><sub style="white-space:normal;">2</sub> of the partial pressure) and high temperature (150<span style="white-space:nowrap;">&#176;</span>C). Microcracks located between the upper and lower weld beads were also observed. However, the highest average corrosion rate was 0.27 mm/year (10.6 mpy), which occurred in samples exposed to 96 psi of H<sub>2</sub>S and 53 psi of <span style="white-space:normal;">CO</span><sub style="white-space:normal;">2</sub> at 150<span style="white-space:nowrap;">&#176;</span>C. Likewise, the highest localized corrosion (severe pitting attack) was obtained at the same environment with a corrosion rate of 4.2 mm/year (167 mpy). The oil and gas industry could use carbon steels pipelines in partial pressure higher than 10 psia. 展开更多
关键词 Sulfide Stress cracking (SSC) hydrogen induced cracking (hic) PITTING WELDING X52 Steel
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INTERPHASE STRESS CORROSION CRACKING OF ALLOY Ti-24Al-11Nb IN METHANOL SOLUTION
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作者 ZHANG Yue CHU Wuyang +1 位作者 XIAO Jimei(Department of Materials Physics,University of Science and Technology Beijing,Beijing 100083,China) OUYANG Shixi YUAN Runzhang(State Key Laboratory for Synthesis and Processing of Advanced Materials.Wuhan University of Techn 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第2期121-128,共8页
For alloy Ti-24Al-11Nb,stress corrosion cracking(SCC) in methanol solution and hydrogen induced cracking(HIC) during dynamic charging at room temperature have been studied.Experiment has shown that the normalised thre... For alloy Ti-24Al-11Nb,stress corrosion cracking(SCC) in methanol solution and hydrogen induced cracking(HIC) during dynamic charging at room temperature have been studied.Experiment has shown that the normalised threshold stress intensities of SCC failure for various microstructures are KISCC/KC =0.53 0.69 and the threshold value for SCC arresting KISCC/ KIC=0.61-0.79.The threshold values of HIC during dynamic charging are close to that of SCC,but da/dt or fracture time of HIC is one to three orders of magnitude smaller or longer than that of SCC,respectively.The.fracture surface for HIC is also different from that for SCC.For the Ti-24Al-Nb alloy-methanol systein,a kind of inierphase SCC has been found For the microstructures resulting from furnace cooling,SCC initiated and propagated preferentially along theα2/βinterphase boundaries,displaying the microstructure on the fracture surface of SCC.However,there is no interphase SCC for the microstructure resulting from air cooling. 展开更多
关键词 Ti-24Al-11Nb hydrogen induced cracking interphase stress corrosion cracking METHANOL
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IN-SITU ELECTRON MICROSCOPY STUDY ON PRECIPITATION OF ZIRCONIUM HYDRIDES INDUCED BY STRESS AND STRAIN IN ZIRCALOY-2
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作者 ZHOU Bangxin ZHENG Sikui WANG Shunxin Southwest Centre for Nuclear Reactor Engineering Research and Design,Chengdu,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第6期412-417,共6页
The precipitation process of zirconium hydrides induced by stress and strain was investigated by means of electron microscopy in-situ.The precipitating hydrides induced by stress were found to be γ phase with orienta... The precipitation process of zirconium hydrides induced by stress and strain was investigated by means of electron microscopy in-situ.The precipitating hydrides induced by stress were found to be γ phase with orientation relationship of (110)_γ‖(110)_(αZr),(001)_γ‖ (0001)_(αZr) between γ-hydrides and surrounding matrix.The growth rate of γ-hydrides which was much faster along [110] direction brought them in taper shape.After fracture of y-hydrides,a new one will precipitate at the tip of cracks.This is the essential process of hydrogen-induced delayed cracking in Zircaloy.The precipitating hydrides induced by strain were found to be δ phase with both orientation relationships of(111)_δ‖(0001)_(αZr),(110)_δ‖ (110)_(αZr) or (010)_δ‖(0001)_(αZr),(001)_δ‖(110)_(αZr)between δ-hydride and surrounding matrix.The δ-hydrides become much finer as the strain rate increased. 展开更多
关键词 Zircaloy-2 precipitation of hydrides hydrides hydrogen-induced delayed cracking
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厚规格X52MS抗HIC性能的研究
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作者 曹妍 张琢晶 张文录 《包钢科技》 2023年第3期45-48,共4页
选用工业生产的酸性服役X52MS管线钢热轧卷板为研究对象,从微观组织和化学成分分析材料性能。主要研究其在硫化氢(H_(2)S)溶液中抗氢致开裂(HIC)行为,用氢致开裂试验考察了微观组织及微区成分对抗HIC性能的影响,分析了裂纹产生的主要原... 选用工业生产的酸性服役X52MS管线钢热轧卷板为研究对象,从微观组织和化学成分分析材料性能。主要研究其在硫化氢(H_(2)S)溶液中抗氢致开裂(HIC)行为,用氢致开裂试验考察了微观组织及微区成分对抗HIC性能的影响,分析了裂纹产生的主要原因,找出裂纹产生的规律。总结出带状组织是导致该材料抗HIC性能失效的主要原因,碳偏析和碳氮化合物夹杂中心聚集会加重带状组织对HIC性能的影响;低碳成分设计思路是酸性服役管线钢设计的前提,同时,合理控制氮含量也是酸性服役管线钢生产时考虑因素之一。 展开更多
关键词 氢致裂纹 管线钢 带状组织 显微组织
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核电厂海水泵用镀锌高强度螺栓的开裂原因
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作者 张彦召 张舟永 +1 位作者 刘洪群 刘忠 《腐蚀与防护》 CAS CSCD 北大核心 2024年第8期99-102,113,共5页
某核电厂海水泵用双头镀锌高强度螺栓发生开裂失效。通过材料性能(化学成分、显微组织和力学性能等)检测及断口和裂纹形貌观察,分析了螺栓的失效原因。结果表明:镀锌螺栓开裂的原因为氢致开裂。锌镀层破损的高强度螺栓与海水接触时,表... 某核电厂海水泵用双头镀锌高强度螺栓发生开裂失效。通过材料性能(化学成分、显微组织和力学性能等)检测及断口和裂纹形貌观察,分析了螺栓的失效原因。结果表明:镀锌螺栓开裂的原因为氢致开裂。锌镀层破损的高强度螺栓与海水接触时,表面锌镀层和螺栓基体形成电偶对,基体作为阴极析出氢,部分原子氢扩散进入螺栓基体导致氢致损伤,螺栓在预紧力的持续作用下发生氢致开裂。 展开更多
关键词 镀锌 高强螺栓 沿晶开裂 氢致开裂 电偶对
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激光制造抗氢脆技术的研究进展及发展趋势
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作者 盛杰 Agyenim-Boateng Emmanuel +4 位作者 赵朝俊 宫国庆 孟宪凯 周建忠 黄舒 《电加工与模具》 北大核心 2024年第5期1-15,20,共16页
氢的密度和体积相对较小,易透过金属表面进入原子晶格。聚集在材料缺陷处的氢原子可再次结合成氢分子,而氢分子的聚集可产生巨大氢压,进而形成氢致裂纹,出现氢脆现象,阻碍各类金属材料在氢能储运中的广泛应用,危害服役件安全。抗氢脆是... 氢的密度和体积相对较小,易透过金属表面进入原子晶格。聚集在材料缺陷处的氢原子可再次结合成氢分子,而氢分子的聚集可产生巨大氢压,进而形成氢致裂纹,出现氢脆现象,阻碍各类金属材料在氢能储运中的广泛应用,危害服役件安全。抗氢脆是材料工程领域的重大课题之一,激光制造技术在抗氢脆方面已展现出一定应用潜力。对多种激光制造技术如激光喷丸强化、激光表面硬化、激光熔覆、激光表面熔化、选择性激光熔化、激光焊接、激光表面退火等在抗氢脆制造中的应用情况进行了综述,重点分析这些技术在富氢环境中如何影响材料的微观结构和机械性能,讨论其在应用中的挑战和瓶颈,并展望其在提高金属材料抗氢脆能力方面的发展趋势。 展开更多
关键词 激光制造技术 表面处理 氢脆 氢致开裂
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Effect of Microstructure on Hydrogen Induced Cracking Behavior of a High Deformability Pipeline Steel 被引量:14
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作者 Xian-bo SHI Wei YAN +3 位作者 Wei WANG Lian-yu ZHAO Yi-yin SHAN Ke YANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第10期937-942,共6页
The hydrogen induced cracking (HIC) behavior of a high deformability pipeline steel was investigated with three different dual-phase microstructures, ferrite and bainite (F+B), ferrite and martensite/austenite is... The hydrogen induced cracking (HIC) behavior of a high deformability pipeline steel was investigated with three different dual-phase microstructures, ferrite and bainite (F+B), ferrite and martensite/austenite islands (F+M/A) and ferrite and martensite (F+M), respectively. The HIC test was conducted in hydrogen sulfide (H2S)-saturated solution. The results showed that the steels with F+B and F+M/A dual-phase microstructures had both higher deformability and better HIC resistance, whereas the harder martensite phase in F+M microstructure was responsible for the worst HIC resistance. The band-like hard phase in dual-phase mi- crostructure was believed to lead to increasing susceptibility to HIC. 展开更多
关键词 pipeline steel high deformability dual-phase microstructure mechanical property hydrogen induced cracking
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