期刊文献+
共找到19篇文章
< 1 >
每页显示 20 50 100
Crystal structure,phase transitions,and thermodynamic properties of magnesium metavanadate(MgV_(2)O_(6)) 被引量:1
1
作者 Guishang Pei Cheng Pan +2 位作者 Dapeng Zhong Junyi Xiang Xuewei Lv 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第4期1449-1460,共12页
As a promising anode material for magnesium ion rechargeable batteries,magnesium metavanadate(MgV_(2)O_(6))has attracted considerable research interest in recent years.A MgV_(2)O_(6)sample was synthesized via a facile... As a promising anode material for magnesium ion rechargeable batteries,magnesium metavanadate(MgV_(2)O_(6))has attracted considerable research interest in recent years.A MgV_(2)O_(6)sample was synthesized via a facile solid-state reaction by multistep-firing stoichiometric mixtures of MgO and V2O5 powder under an air atmosphere.The solid-state phase transition fromα-MgV_(2)O_(6)toβ-MgV_(2)O_(6)occurred at 841 K and the enthalpy change was 4.37±0.04 kJ/mol.The endothermic effect at 1014 K and the enthalpy change was 26.54±0.26 kJ/mol,which is related to the incongruent melting ofβ-MgV_(2)O_(6).In situ XRD was performed to investigate phase transition of the as-prepared MgV_(2)O_(6)at high temperatures.The cell parameters obtained by Rietveld refinement indicated that it crystallizes in a monoclinic system with the C2/m space group,and the lattice parameters of a=9.280 A°,b=3.501 A°,c=6.731 A°,β=111.76°.The solid-state phase transition fromα-MgV_(2)O_(6)toβ-MgV_(2)O_(6)was further studied by thermal kinetics,indicating that this process is controlled first by a fibril-like mechanism and then by a spherulitic-type mechanism with an increasing heating rate.Additionally,the enthalpy change of MgV_(2)O_(6)at high temperatures was measured utilizing the drop calorimetry,heat capacity was calculated and given as:Cp=208.3+0.03583T-4809000T^(−2)(298-923 K)(J mol^(−1)K^(−1)),the high-temperature heat capacity can be used to calculate Gibbs free energy of MgV_(2)O_(6)at high temperatures. 展开更多
关键词 MgV_(2)O_(6) Crystal structure Phase transitions Thermodynamic functions
下载PDF
Microstructure and textural evolution during cold rolling and annealing of commercially pure titanium sheet 被引量:14
2
作者 Na LIU Ying WANG +4 位作者 Wei-jun HE Jun LI Adrien CHAPUIS Bai-feng LUAN Qing LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第6期1123-1131,共9页
The effects of cold rolling and annealing on the microstructure and textural evolution of a commercially pure titanium(CP-Ti) sheet were investigated. Electron backscatter diffractometry demonstrates that the deform... The effects of cold rolling and annealing on the microstructure and textural evolution of a commercially pure titanium(CP-Ti) sheet were investigated. Electron backscatter diffractometry demonstrates that the deformation during rolling is accommodated by twinning and slip. Additionally, twinning is the dominant deformation mechanism when the cold rolling reduction is less than 40%. During rolling, {11ˉ22}11ˉ2ˉ3contraction twinning(CT) and {10ˉ12}10ˉ11 extension twinning(ET) are activated. And, the intensity of the(0002) pole along the ND gradually increases with increasing deformation. During annealing, the fraction of low angle grain boundaries(LAGBs) and the intensity of the(0002) pole along the ND gradually decrease slightly with increasing annealing time, while twinning lamellae disappear rapidly. When the annealing time reaches 60 min, 20% cold-rolled sheet recrystallizes almost completely. 展开更多
关键词 commercially pure titanium texture TWINNING cold rolling RECRYSTALLIZATION
下载PDF
Effect of annealing temperature on microstructure and mechanical properties of cold-rolled commercially pure titanium sheets 被引量:3
3
作者 Shuai ZHAO Yang WANG +3 位作者 Lin PENG Yuan-xiang ZHANG Rong RAN Guo YUAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第8期2587-2597,共11页
The strength of traditional commercially pure titanium(CP-Ti) alloys often fails to meet the demand of structural materials. In order to enhance their mechanical properties, the cold-rolled CP-Ti alloys were annealed ... The strength of traditional commercially pure titanium(CP-Ti) alloys often fails to meet the demand of structural materials. In order to enhance their mechanical properties, the cold-rolled CP-Ti alloys were annealed at different temperatures, and the recrystallization behavior and texture evolution were investigated. It was found that the bimodal microstructure(equiaxed and elongated grains) was formed after partial recrystallization, and the corresponding sample exhibited an excellent combination of ultimate tensile strength(702 MPa) and total elongation(36.4%). The recrystallization nucleation of CP-Ti sheets occurred preferentially in the high strain and the high-angle grain boundaries(HAGBs) regions. Meanwhile, the internal misorientations of the deformed heterogeneous grains increased and transformed into HAGBs, which further promoted the recrystallization nucleation. The main recrystallization texture was basal TD-split texture transformed from cold-rolled basal RD-split texture, and the oriented nucleation played a dominated role during recrystallization. 展开更多
关键词 commercially pure titanium recrystallization nucleation bimodal microstructure mechanical properties TEXTURE
下载PDF
Cyclic metallurgical process for extracting Ⅴ and Cr from vanadium slag: Part Ⅰ. Separation and recovery of Ⅴ from chromium-containing vanadate solution 被引量:3
4
作者 Xue-wen WANG Ming-e YANG +3 位作者 Yu-qi MENG Da-xiong GAO Ming-yu WANG Zi-bi FU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第3期807-816,共10页
The separation and recovery of V from chromium-containing vanadate solution were investigated by a cyclic metallurgical process including selective precipitation of vanadium,vanadium leaching and preparation of vanadi... The separation and recovery of V from chromium-containing vanadate solution were investigated by a cyclic metallurgical process including selective precipitation of vanadium,vanadium leaching and preparation of vanadium pentoxide.By adding Ca(OH)_(2) and ball milling,not only the V in the solution can be selectively precipitated,but also the leaching kinetics of the precipitate is significantly improved.The precipitation efficiency of V is 99.59%by adding Ca(OH)_(2) according to Ca/V molar ratio of 1.75:1 into chromium-containing vanadate solution and ball milling for 60 min at room temperature,while the content of Cr in the precipitate is 0.04%.The leaching rate of V reaches 99.35%by adding NaHCO_(3) into water according to NaHCO_(3)/V molar ratio of 2.74:1 to leach V from the precipitate with L/S ratio of 4:1 mL/g and stirring for 60 min at room temperature.The crystals of NH_(4)VO_(3) are obtained by adjusting the leaching solution pH to be 8.0 with CO2 and then adding NH_(4)HCO_(3) according to NH_(4)HCO_(3)/NaVO_(3) molar ratio of 1:1 and stirring for 8 h at room temperature.After filtration,the crystallized solution containing ammonia is reused to leach the precipitate of calcium vanadates,and the leaching efficiency of V is>99%after stirring for 1 h at room temperature.Finally,the product of V_(2)O_(5) with purity of 99.6%is obtained by calcining the crystals at 560℃ for 2 h. 展开更多
关键词 chromium-containing vanadate solution calcium salt precipitating vanadium sodium bicarbonate leaching ammonium salt precipitating vanadate cyclic metallurgical process
下载PDF
Application of reflux classifier with closely spaced inclined channels in pre-concentrate process of fine antimony oxide particles 被引量:2
5
作者 LIU Zhen-qiang LU Dong-fang +3 位作者 WANG Yu-hua CHU Hao-ran ZHENG Xia-yu CHEN Fu-lin 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3290-3301,共12页
In this work,the reflux classifier with closely spaced inclined channels is used as the pre-concentration facility to improve the separation efficiency before the shaking table separation.Three operating parameters of... In this work,the reflux classifier with closely spaced inclined channels is used as the pre-concentration facility to improve the separation efficiency before the shaking table separation.Three operating parameters of reflux classifier(RC)to pre-concentrate fine(0.023−0.15 mm)tailings of antimony oxide were optimized by response surface methodology(RSM)using a three-level Box-Behnken design(BBD).The parameters studied for the optimization were feeding speed,underflow,and ascending water speed.Second-order response functions were produced for the Sb grade and recovery rate of the concentrate.Taking advantage of the quadratic programming,when the factors of feeding,underflow and ascending water are respectively 225,30 and 133 cm^3/min,a better result can be achieved for the concentrate grade of 2.31% and recovery rate of 83.17%.At the same time,70.48% of the tailings with the grade of 0.20% were discarded out of the feeding.The results indicated that the reflux classifier has a good performance in dealing with fine tailings of antimony oxide.Moreover,second-order polynomial equations,ANOVA,and three-dimensional surface plots were developed to evaluate the effects of each parameter on Sb grade and recovery rate of the concentrate. 展开更多
关键词 reflux classifier antimony oxide PRE-CONCENTRATION inclined channels
下载PDF
Oxidation and internal nitridation behaviors of a Ni-based superalloy Rene 65 during high-temperature homogenization 被引量:2
6
作者 Xian-guang Zhang Jia-jun Chen +8 位作者 Yang Zhou Lang Shui Dong-ping Xiao Jian-hui Fu Wen-chao Yang Huan Liu Ying-jie Ren Peng Shi Jian Zhang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第8期1622-1632,共11页
Homogenization heat treatment is a key process to remove the micro-segregation and re-dissolve the undesired phases for wrought superalloy.The oxidation behavior of the wrought superalloy during the high-temperature h... Homogenization heat treatment is a key process to remove the micro-segregation and re-dissolve the undesired phases for wrought superalloy.The oxidation behavior of the wrought superalloy during the high-temperature homogenization process,however,was rarely studied.The oxidation film evolution and growth kinetics of an as-cast superalloy Rene 65 during the homogenization were systematically studied.The oxide film consists of Cr_(2)O_(3) external oxidation layer and dendritic TiO_(2) and Al_(2)O_(3) internal oxidation layer.And the growth kinetics of the oxide film followed a parabolic law.Internal nitridation occurs during the oxidation process,and TiN is apparently formed at the tip of internal oxidation layer.The originally formed TiN can be transformed into TiO_(2) or retained with the progress of oxidation.Meanwhile,the TiN is newly formed in the deeper matrix at the new oxidation-layer tip.Thermodynamic analyses revealed that there is a competition between the oxidation and nitridation.Nitridation can occur when the partial pressure of nitrogen exceeds the threshold of nitridation and the critical partial pressure ratio of nitrogen and oxygen. 展开更多
关键词 Nickel-based superalloy HOMOGENIZATION OXIDATION Kinetics Internal nitridation THERMODYNAMICS
原文传递
Solidification and heat transfer of molten steel slag particles during air quenching process 被引量:1
7
作者 Wen-feng Gu Jiang Diao +4 位作者 Rui-xin Hu Wen-sun Ge Wen-feng Tan Hong-yi Li Bing Xie 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第9期1834-1842,共9页
In order to effectively utilize the resources and energy of molten steel slag,the variation of precipitation phase and specific heat of air quenched steel slag(AQSS)particles during continuous cooling process was inve... In order to effectively utilize the resources and energy of molten steel slag,the variation of precipitation phase and specific heat of air quenched steel slag(AQSS)particles during continuous cooling process was investigated by FactSage and thermogravimetry differential scanning calorimetry.The cooling and solidification process of molten AQSS particles was simulated by Fluent.The microstructure changes in AQSS particles in solidification process were analyzed using an ultrahigh temperature laser confocal microscope and a scanning electron microscope.The results indicated that in the cooling process of molten AQSS particles,the precipitation of Ca_(2)Fe_(2)O_(5) resulted in the largest change of specific heat.Under the condition of slow cooling,the cooling rate is more obviously affected by specific heat.When the initial air velocity was 300 m s^(-1),there was the highest temperature difference in AQSS particles during cooling process.What is more,the compactness of the boundary region of AQSS particles was obviously better than that of its central region. 展开更多
关键词 Specific heat Air quenched steel slag COOLING SOLIDIFICATION Microstructure change
原文传递
Wettability between titanium-containing steels and TiN ceramic substrate
8
作者 Ya-cen Deng Hao Liu +3 位作者 Min Zhang Xu-bin Zhang Qiang-qiang Wang Sheng-ping He 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第4期677-686,共10页
The wettability between TiN ceramic substrates and steels with various Ti contents was studied under an argon atmosphere at 1550℃ using a modified sessile drop method.An electron probe microanalyzer and thermodynamic... The wettability between TiN ceramic substrates and steels with various Ti contents was studied under an argon atmosphere at 1550℃ using a modified sessile drop method.An electron probe microanalyzer and thermodynamic calculations were applied to investigate the interface between the steels and the TiN substrates as well as the surface of solidified steel droplets.The measured apparent contact angles between the TiN substrates and steels were 96°,91°,and 146°,as the Ti content in the steel samples was 0.01,0.31,and 0.68 wt.%,respectively.No reaction products were found at the interface,and only physical interactions occurred.The wettability between high titanium steels(0.68 wt.%Ti)and TiN ceramic substrates should be evaluated from various perspectives,as many TiN particles existing in steel made the apparent contact angle increased significantly,deviating from the true value of contact angle. 展开更多
关键词 WETTABILITY Contact angle High-Ti steel TiN ceramic
原文传递
High cycle fatigue behavior of titanium microalloyed high-strength beam steels
9
作者 Zhi-jun Gao Guang-fei Pan +3 位作者 Yu Song Shui-ze Wang Xiao-yu Ye Xin-ping Mao 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第11期2267-2279,共13页
The realization of an ideal combination of mechanical and fatigue properties is prerequisites for practical application of titanium(Ti)microalloyed steel in automotive field.The fatigue behavior of four Ti microalloye... The realization of an ideal combination of mechanical and fatigue properties is prerequisites for practical application of titanium(Ti)microalloyed steel in automotive field.The fatigue behavior of four Ti microalloyed high-strength beam steels with different Ti contents was systematically studied.The results show that the content of microalloying element Ti has a significant effect on the fatigue properties,especially in the steel with a high Ti content.For the experimental Ti microalloyed steel,inclusion-induced crack initiation is the main fatigue failure mode.Different from general fatigue fracture mechanism in Ti-contained steel,no TiN,which is the most detrimental to fatigue behavior,was found in fatigue crack initiation area.However,the large-sized TiN and oxide complex inclusion with a core-shell structure is the dominant cause of fatigue fracture.Because of the intense-localized deformation at the interface between complex inclusion and matrix,the angular TiN in the outer shell has a serious deteriorating effect on the fatigue properties,which is consistent with the result of the Kernel average misorientation map.Besides,the modification effect of a small amount of MnS on large-sized inclusion is not obvious and has little effect on the fatigue behavior.For more practical guidance,the critical inclusion sizes of the experimental steels were also investigated by experimental extrapolation method.With the increasing tensile strength,the inclusion sensitivity of the experimental steels increases,leading to the small critical inclusion size. 展开更多
关键词 Titanium microalloyed steel High cycle fatigue Fatigue fracture Critical inclusion size
原文传递
Synthesis of vanadium powder by magnesiothermic reduction of V_(2)O_(3)in a reactive molten salt
10
作者 Da-peng Zhong Gui-shang Pei +5 位作者 Jia-long Kang Jun-yi Xiang Cheng Pan Wu-an Gu Xue-wei Lv Lan-jie Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2023年第4期650-659,共10页
As an important strategic metal,vanadium is generally used to prepare special steels,titanium alloys,and hydrogen storage materials.A new method of producing vanadium(metal)powder from V_(2)O_(3)using block Mg is pres... As an important strategic metal,vanadium is generally used to prepare special steels,titanium alloys,and hydrogen storage materials.A new method of producing vanadium(metal)powder from V_(2)O_(3)using block Mg is presented herein.Using an auxiliary molten salt,V_(2)O_(3)was successfully transformed into V by Mg reduction.The by-product,MgO,was transformed into MgCl_(2)by adding ZrCl_(4),which prevented the generation of MgV_(2)O_(4)and allowed the reaction to proceed smoothly.The rod-like alloy phases,Zr_(0.03)V_(1.97),which formed in the presence of excess Mg,may hinder the diffusion of oxygen from the product.The recovery rate of vanadium after separation and purification was approximately 45%–50%,where the main loss occurred during ball milling.Under the optimal conditions(Mg content of 48.3%,reduction time of 1.5 h,and temperature of 850℃),the purity of vanadium exceeded 99 wt.%,and the O content decreased to 0.34 wt.%. 展开更多
关键词 DEOXIDATION Vanadium powder Magnesiothermic reduction Molten salt
原文传递
Development of Intensified Technologies of Vanadium-Bearing Titanomagnetite Smelting 被引量:28
11
作者 FU Wei-guo WEN Yong-cai XIE Hong-en 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第4期7-10,18,共5页
It was very difficult for the smelting of vanadium-bearing titanomagnetite by blast furnace because the content of TiO2 of blast furnace slag could amount to 20%-25%.After long term development and continuous improvem... It was very difficult for the smelting of vanadium-bearing titanomagnetite by blast furnace because the content of TiO2 of blast furnace slag could amount to 20%-25%.After long term development and continuous improvement,special intensified smelting technologies for vanadium-bearing titanomagnetite by blast furnace were obtained and improved gradually.With the improvement of beneficiated material level and equipment level,smelting intensity has been increased gradually and the highest comprehensive smelting intensity reached 1.45 t/(m3·d).Technical-economic indexes of blast furnace have also been increased remarkably.The highest utilization coefficient exceeded 2.7 t/(m3·d)on the condition that the burden grade was only about 50%. 展开更多
关键词 vanadium-bearing titanomagnetite blast furnace smelting intensified technology
原文传递
Causes of surface stripe cracks of Ti–4Al–2V alloy cold-rolled sheet 被引量:3
12
作者 De-Ming Huang Xiong-Fei Yang +4 位作者 Qing-Feng Wei Yong Chen Hua Guo Sheng-Long Liang Ying Wang 《Rare Metals》 SCIE EI CAS CSCD 2014年第5期522-526,共5页
The stripe cracks which formed along rolling direction on the surface of Ti–4Al–2V alloy cold-rolled sheet were observed by stereoscope, scanning electron microscope(SEM), and energy-dispersive spectrometer(EDS)... The stripe cracks which formed along rolling direction on the surface of Ti–4Al–2V alloy cold-rolled sheet were observed by stereoscope, scanning electron microscope(SEM), and energy-dispersive spectrometer(EDS). Morphology analysis indicates that cracks are dominantly in zigzag shape, with 10–30 mm in length and less than 10 lm in depth, and there is no evidence of crack tips. Chemical composition analysis shows that crack regions feather high oxygen concentration while smooth surface is at normal oxygen level. It is obvious that the occurrence of strip cracks is mainly related to residual oxide on the surface of Ti–4Al–2V alloy cold-rolled sheet. 展开更多
关键词 Ti-4Al-2V Cold-rolled sheet SURFACE Stripe cracks
原文传递
In-situ analysis of retained austenite transformation in high-performance micro-alloyed TRIP steel 被引量:2
13
作者 Ji-bo Peng Hu Jiang +5 位作者 Gong-ting Zhang Li-ben Chen Na-qiong Zhu Yan-lin He Xiao-gang Lu Lin Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第3期313-320,共8页
Microstructures and mechanical properties of Ti-V micro-alloyed TRIP( transformation-induced plasticity) steel with different compositions were investigated by tensile test,scanning electron microscopy( SEM),trans... Microstructures and mechanical properties of Ti-V micro-alloyed TRIP( transformation-induced plasticity) steel with different compositions were investigated by tensile test,scanning electron microscopy( SEM),transmission electron microscopy( TEM),X-ray diffraction( XRD) and thermodynamic calculation( TC). The results indicated that the steel exhibited high ultimate tensile strength( 1 079MPa),sufficient ductility( 28%) and the highest product of strength and ductility( 30 212 MPa·%) heat treated after intercritical annealing at 800℃ for 3 min and bainitic annealing at 430 ℃ for 5 min. In addition,the change of volume fraction of retained austenite( VF-RA) versus tensile strain was measured using in-situ analysis by X-ray stress apparatus and micro-electronic universal testing machine. It was concluded that a-value could be used to evaluate the stability of retained austenite( S-RA) in the investigated Ti-V micro-alloyed TRIP steel. The smaller a-value indicated the higher stability of retained austenite( S-RA) and the higher mechanical properties of Ti-V micro-alloyed TRIP steel. 展开更多
关键词 Ti-V micro-alloyed TRIP steel Retained austenite stability In-situ analysis Microstructure
原文传递
Effect of basicity and Al2O3 on viscosity of ferronickel smelting slag 被引量:2
14
作者 Yong-feng Chen Xue-ming Lv +1 位作者 Zheng-de Pang Xue-wei Lv 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2020年第12期1400-1406,共7页
The effect of the Al2O3 content and basicity (the molar ratio of MgO to SiO2) on the viscosity of a SiO2-MgO-FeOAl2O3-CaO slag was studied to fully understand the smelting process of the ferronickel alloy. Experimenta... The effect of the Al2O3 content and basicity (the molar ratio of MgO to SiO2) on the viscosity of a SiO2-MgO-FeOAl2O3-CaO slag was studied to fully understand the smelting process of the ferronickel alloy. Experimental results show that the slag is a mixture of liquid and solid phases at the experimental temperature. The viscosity decreased as the basicity increased and increased as the Al2O3 content increased. To determine the effect of the Al2O3 content and basicity on the structure of the molten slag, Raman spectroscopy was performed on the slag sample, which was quenched from the high temperature with water. The Raman spectra showed that the fractions of the polymerization structural units decreased significantly as the basicity of the slag increased, resulting in a decrease in the apparent viscosity. However, Al2O3 acts as a network former in the slag system, thereby making the slag structure further polymerized and increasing the viscosity. 展开更多
关键词 Nickel laterite ore Slag structure VISCOSITY BASICITY Ferronickel smelting slag
原文传递
Real-time observation of bainite formation at heterogeneous phases in a high-strength weathering steel 被引量:1
15
作者 Jian Cheng Jia-sheng Qing +1 位作者 Yue-hua Guo Hou-fa Shen 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2019年第3期301-309,共9页
Due to the excellent comprehensive mechanical properties and toughness of bainite steels,bainite is regarded as a most desirable microstructure for the new generation of high-strength weathering steels.The formation o... Due to the excellent comprehensive mechanical properties and toughness of bainite steels,bainite is regarded as a most desirable microstructure for the new generation of high-strength weathering steels.The formation of bainite was observed in real time in a high-strength weathering steel,and the results showed that bainite laths show impingement during phase transformation.The preferred regions of nucleation sites were identified,and the growth rate of bainite was measured.The growth mechanism of bainite was demonstrated to exhibit growth rate contributions from both the diffusion mechanism and the shear mechanism.Subsequently,the heterogeneous phases that form preferred sites for bainite nucleation were quantitatively identified by scanning electron microscopy(SEM),energy-dispersive X-ray spectrometry(EDS),and calculation of phase diagram(CALPHAD).The austenite grain sizes in crease with increasing austenite temperature,which leads to longer bainite laths.The influence of a small lattice disregistry between the heterogeneous phases and bainite on the bainite nucleation was studied.The disregistries between the favorable heterogeneous phases of VN,VC,TiN,or TiC and the ot-Fe in bainite are 2.9,3.1,3.9,and 4.6%,respectively.Therefore,VN,VC,TiN,and TiC can act as highly effective nuclei for bainite during the bainite transformation. 展开更多
关键词 BAINITE Real-time observation PLASTICITY Phase transformation WEATHERING steel
原文传递
Study on Metallurgic Effects of M-EMS in Bloom Continuous Casting
16
作者 LI Zhi-qiang ZENG Jian-hua +2 位作者 WU Guo-rong PAN Hong CHEN Yong 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2012年第S2期997-1000,共4页
In this paper,the M-EMS magnetic field intensity and bloom quality in different periods is counted,and on this basis,the effect of magnetic field intensity of M-EMS on casting bloom quality is analyzed.In order to get... In this paper,the M-EMS magnetic field intensity and bloom quality in different periods is counted,and on this basis,the effect of magnetic field intensity of M-EMS on casting bloom quality is analyzed.In order to get the exact effect of M-EMS on bloom quality,different magnetic field intensity in a single strand is gotten through changing the current intensity of M-EMS.Then,the corresponding test samples of casting bloom under different magnetic field intensity are sent to give a test.On this basis,the effect of magnetic field intensity on bloom quality is studied in a single strand.And then the metallurgic effects of bloom M-EMS in Pangang are evaluated and the using standard of M-EMS is established. 展开更多
关键词 EMS continuous casting MOLD bloom quality
原文传递
Influence of N/C ratio on microstructure and properties of new highstrength weathering steels
17
作者 Jian Cheng Yue-hua Guo Hou-fa Shen 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2019年第1期84-90,共7页
Influence of the N/C ratio on the microstructure and properties of new-generation high-strength weathering steels was investigated using calculation of phase diagram(CALPHAD)and experiments.The microstructures of weat... Influence of the N/C ratio on the microstructure and properties of new-generation high-strength weathering steels was investigated using calculation of phase diagram(CALPHAD)and experiments.The microstructures of weathering steels containing different N/C ratios were predicted by a CALPHAD approach,and only three phases were predicted in these steels within the rolling temperature range of 850-1050℃.The precipitation fraction of VN/V(C,N)in creases with increasing N/C ratio.Microstructures of the four tested steels were all experimentally determined to contain bainite,ferrite,and VN precipitates after air cooling to room temperature.The bainite fraction increases with in creasing N/C ratio,and it is 85%in the steel containing 0.038% N and 0.032% C,The results of the tensile tests and impact tests demonstrated that the yield strength and tensile strength of the steel containing 0.038%N and 0.032%C are greater than 550 and 650 MPa,respectively,and the elongation is greater than 24%,which satisfies the design objectives for mechanical properties.The impact toughness values of the four steels at 0,-20,and-40℃ are all greater than 24 J.With increasing N/C ratio,the bainite fraction and the precipitation fraction of VN/V(C,N)increase,resulting in increasing yield strength and tensile strength. 展开更多
关键词 CALPHAD WEATHERING steel TENSILE test-Impact TEST Microstructure
原文传递
Effect of two-step cooling process on mechanical properties of TRIP steel with high performance
18
作者 M.L. Li H. Jiang +5 位作者 Y.L. He L.B. Chen G.T. Zhang H. Wang X.G. Lu L. Li 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第4期426-432,共7页
A novel two-step cooling experiment was established to simulate the slow cooling process of continuous annealing production line for transformation-induced plasticity (TRIP) steel. The microstructures and mechanical... A novel two-step cooling experiment was established to simulate the slow cooling process of continuous annealing production line for transformation-induced plasticity (TRIP) steel. The microstructures and mechanical properties of TRIP steel soaked at 700℃ for different time were investigated by tensile test, scanning electron microscopy, X-ray diffraction, and thermodynamic and kinetic calculation. It is shown that the steel soaked for 15 s exhibits the optimal product of strength and elongation (PSE 〉 30,000 MPa%) due to the transformation of austenite to proeutectoid ferrite, which delays the bainite transformation and improves the stability of retained austenite. In addition, the mechanical properties of TRIP steel soaked over 30 s are much lower, resulting from the precipitation of cementite, which decreases the stability of retained austenite and weakens the TRIP effect. 展开更多
关键词 TRANSFORMATION induced plasticity steel Two-step cooling Microstructure Mechanical property
原文传递
Metadynamic recrystallization and microstructure evolution of a continuously cast Ti-microalloyed steel slab with heavy reduction
19
作者 Zi-jian Wei Cheng Ji +2 位作者 Tian-ci Chen Miao-yong Zhu Chen-hui Wu 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2022年第1期103-114,共12页
The effects of the deformation parameters in the heavy reduction(HR)process on recrystallization kinetics and microstructure evolution were analyzed.Based on the experimental results,metadynamic recrystallization(MDRX... The effects of the deformation parameters in the heavy reduction(HR)process on recrystallization kinetics and microstructure evolution were analyzed.Based on the experimental results,metadynamic recrystallization(MDRX)kinetic and austenite grain size models were established for a continuously cast slab during HR.Moreover,the evolution of the quenched microstructure after MDRX was observed using electron backscatter diffraction.The relative frequency of very low-angle grain boundaries decreased from 58.8% to 52.1%,and the relative frequency of high-angle grain boundaries increased from 28.5% to 38.9%.Analyses revealed that the recovery was the main softening mechanism.The decrease in the total grain boundary length indicated that subgrain growth occurred with increasing inter-pass time.The main texture evolved from a {001}<110>texture to a{112}<111>texture,and the texture strength remained unchanged. 展开更多
关键词 Microalloyed steel Heavy reduction Metadynamic recrystallization Microstructure evolution Kinetic model
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部