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钢铁研究学报（英文版）
钢铁研究学报（英文版）

田志凌

月刊

1006-706X

gtyjxb-e@163.com

010-62182295

100081

北京市海淀区学院南路76号

钢铁研究学报（英文版）/Journal Journal of Iron and Steel Research, InternationalCSCDCSTPCD北大核心EISCI
正式出版
收录年代

    Microstructure evolution and its influence on thermoplasticity of wide and thick continuous casting slab with heavy reduction

    Tian-ci ChenXin HuTan ZhaoCheng Ji...
    2196-2206页
    查看更多>>摘要：After the heavy reduction(HR)process was carried out at the solidification end of the continuous casting slab,the austenite grains were refined by recrystallization,which improved the thermoplasticity of the slab.However,the reduction in deformation during the HR process initiated stress concentration at the slab surface,and the crack risk increased.To effectively evaluate the risk of slab surface cracks under these complex conditions,the effect of the HR on the austenite recrystallization and thermoplasticity of a microalloyed slab surface was investigated by 15-pass reduction thermal sim-ulation according to the wide and thick slab continuous casting process.The softening fraction was introduced as a global internal variable to quantitatively analyze various recrystallized re-refined grains.After the critical strain reaches the critical strain of dynamic recrystallization,a variety of recrystallization modes alternately occur.Among them,the contribution rate of dynamic crystallization to the later refinement reaches more than 50%.The contribution rates of static recrystallization and metadynamic recrystallization to grain refinement are almost the same.The thermoplasticity of the slab surface first increases and then decreases with increasing reduction pass.It was verified by transmission electron microscopy that the main reason for the decrease in thermoplasticity is that the dislocation multiplication rate increases,resulting in a sharp increase in stress and a decrease in thermoplasticity.
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    Understanding thermal compression and deformation behavior of 3.15 wt.%Si non-oriented electrical steels prepared by sub-rapid solidification

    Hui-hui WangWan-lin WangHua-long LiSheng-jie Wu...
    2207-2216页
    查看更多>>摘要：Sub-rapid solidification has the potential to enhance the columnar structure and the magnetic property of electrical steels.However,research on the hot deformation behavior of sub-rapid solidified non-oriented electrical steel,particularly at varying strain rates,has yet to be fully understood.The effect of thermal compression on the microstructure and mechanical properties of 3.15 wt.%Si non-oriented electrical steel strips produced through a strip casting simulator was systematically investigated.The findings reveal that increasing the deformation temperature enhances grain recrystal-lization,while the peak stress decreases with higher temperature.Furthermore,a lower strain rate favors dynamic recrystallization and reduces thermal stress.It can be seen that sub-rapid solidification can effectively reduce the thermal activation energy of non-oriented electrical steel,and the thermal activation energy is calculated to be 204.411 kJ/mol.In addition,the kinetic models for the dynamic recrystallization volume fraction of the studied 3.15 wt.%Si non-oriented electrical steel were established.
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    Theoretical and numerical research on effect of tension mechanisms in strip flatness electromagnetic control rolling mills

    Ting-song YangTie-heng YuanWen-quan SunAn-rui He...
    2217-2235页
    查看更多>>摘要：To achieve stable rolling,the influence of a tension mechanism of a large diameter ratio roll system on the rolling process of a strip flatness electromagnetic control rolling mill is studied.Through the analysis of the rolling deformation zone,the deformation zone composition form of a large diameter ratio roll system and a calculation formula of neutral angle under tension are proposed.To analyze the effect of front and post tensions on the rolling characteristic and the strip flatness control characteristic,a three-dimensional rolling finite element(FE)model of a large diameter ratio roll system with the function of roll profile electromagnetic control is established by FE software and verified by a strip flatness electromagnetic control rolling mill.Based on the model,the strip thickness characteristic,metal transverse flow,strip flatness state,and adjustment range of the loaded roll gap are analyzed for different front and post tensions setting values.The results show that changing the front or post tension setting values can improve the single-pass reduction rate of a large diameter ratio roll system and have little effect on the flatness control ability of the strip flatness electromagnetic control rolling mill.
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    Finite element model simulation and back propagation neural network modeling of void closure for an extra-thick plate during gradient temperature rolling

    Shun-hu ZhangWen-hao TianLi-zhi CheWei-jian Chen...
    2236-2247页
    查看更多>>摘要：The void closure behavior in a central extra-thick plate during the gradient temperature rolling was simulated and a back propagation(BP)neural network model was established.The thermal-mechanical finite element model of the gradient temperature rolling process was first developed and validated.The prediction error of the model for the rolling force is less than 2.51%,which has provided the feasibility of imbedding a defect in it.Based on the relevant data obtained from the simulation,the BP neural network was used to establish a prediction model for the compression degree of a void defect.After statistical analysis,80%of the data had a hit rate higher than 95%,and the hit rate of all data was higher than 90%,which indicates that the BP neural network can accurately predict the compression degree.Meanwhile,the comparisons between the results with the gradient temperature rolling and uniform temperature rolling,and between the results with the single-pass rolling and multi-pass rolling were discussed,which provides a theoretical reference for developing process parameters in actual production.
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    Modeling of strain-induced γ→α'phase transformation for 201Cu metastable austenitic stainless steel and its verification in rolling processes

    Li-xia XuLong-hui ZhouHong-yun BiE Chang...
    2248-2254页
    查看更多>>摘要：To model the strain-induced γ→α'phase transformation for the Cr-Mn metastable austenitic stainless steel,the 201Cu steel was chosen as the analytical material and the cylindrical samples of this steel with size of φ5 mm×10 mm were compressed at strains of 0.2-0.6 in the temperature range of 25-150℃ and in the strain rate range of 0.1-5.0 s-1.The flaky samples were prepared by wire cutting from the cylindrical samples and the volume fraction of the strain-induced α'phase was detected in the test point of the flaky samples.The volume fraction changing with the process parameters was modeled,and the critical temperatures and the critical strains to prevent γ→α'phase transformation were calculated as other different process parameters changed.The linear fitting goodness of the model between the calculated volume fraction values and the tested ones is 0.986 and the validity of the model was verified by application in cold and warm rolling experiments.
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    Mechanisms of strength-plasticity enhancement and stress-induced phase transition in a medium-carbon low-alloy steel

    Meng-wei LuXin ChenWen-xi LiuYu-ru Chen...
    2255-2270页
    查看更多>>摘要：A medium-carbon low-alloy steel with designed chemical composition was investigated.The steel exhibits an excellent product of strength and elongation value of 31,832 MPa%through quenching and partitioning treatment,with a tensile strength of 1413 MPa and elongation of 22%.X-ray diffraction analysis and transmission electron microscopy charac-terizations confirm that the retained austenite in the specimens undergoes stress-induced phase transformation to the martensite and hexagonal phases,namely the transformation-induced plasticity(TRIP)effect is triggered.This TRIP effect,triggered by the stress-induced phase transition of retained austenite,is responsible for the excellent mechanical properties obtained in the steel.For further investigating the stress-induced phase transition mechanism,thermodynamic methods are applied.Gibbs free energy of face-centered cubic-Fe,ε-Fe,ω-Fe and body-centered cubic-Fe associated with the stress-induced phase transition was calculated using molecular dynamics simulations,and a calculation method of strain energy in thermodynamic units for the stress-induced martensitic transformation is presented.The final results reveal the process and thermodynamic mechanism of stress-induced martensitic transformation in medium-carbon steels,in which the hexagonal phase can participate in the process as an intermediate product.
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    Hot deformation behavior and hot-metal-gas-forming process of V micro-alloyed high manganese steel

    Yong-gang YangWang-nan ZuoMei XuChang-hui Yuan...
    2271-2280页
    查看更多>>摘要：The hot deformation behavior of a newly designed V micro-alloyed high manganese steel(HMnS)was investigated in order to guide the development of the hot-metal-gas-forming process.Single-pass hot compression experiments were conducted in the temperature range of 950-1100℃ and the strain rate range of 0.05-10 s-1,and the stress-strain curves and the corresponding softening mechanism of the V micro-alloyed HMnS were analyzed.Results show that two types of stress-strain curves,representing the work hardening(WH)-dynamic recovery(DRV)-dynamic recrystallization(DRX)mechanism and the WH-DRV mechanism,respectively,occur during the deformation process.Moreover,the WH-DRV-DRX mechanism gradually transforms into the WH-DRV mechanism with the increasing strain rate and decreasing deformation temperature.Two types of constitutive models considering the softening mechanism difference were estab-lished and verified by additional hot-deformation experiments.Hot processing map of the HMnS was established and correlated well with the microstructure evolution result.Based on the constitutive models and processing map,the optimal processing parameter range and flow stress of HMnS for the hot-metal-gas-forming were determined.
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    Pitting corrosion initiated by SiO2-MnO-Cr2O3-Al2O3-based inclusions in a 304 stainless steel

    Jin-zhen HuShi LiJi ZhangYing Ren...
    2281-2293页
    查看更多>>摘要：The number,area,and composition of non-metallic inclusions were modified by the addition of aluminum in the steel,which was responsible for the variation of the corrosion degree of the 304 stainless steel.Inclusions detection,corrosion test,electrochemical test,thermodynamic calculation,and first-principles calculation were performed to evaluate the pitting corrosion of the stainless steel.The initiation of the pitting corrosion by three types of inclusions,including(Mn,Si,Cr,S)O,(Mn,Al,Cr)O,and Al2O3 were in-situ observed.After corroding for 880 min,the corrosion index of(Mn,Si,Cr,S)O,(Mn,Al,Cr)O,and Al2O3 was 0.38%,0.02%,and 0.00%min-1,respectively.With the increase in aluminum content in the steel,the pitting potential of the stainless steel was 0.131,0.304,and 0.338 V,respectively,indicating that a higher aluminum content in the steel was beneficial to improving the pitting corrosion resistance of the 304 stainless steel.
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    Corrosion mechanism of Zn-Al-Mg-coated steel in simulated polluted marine atmosphere

    Pei-dong NingLi-yuan XiaoJin WangQian-qian Liu...
    2294-2307页
    查看更多>>摘要：The corrosion behaviour of zinc-aluminium-magnesium-coated steel in a simulated polluted marine atmospheric envi-ronment was investigated.Therefore,an indoor ageing acceleration test was carefully designed by simulating a polluted marine environment.The objective was to in-depth investigate the corrosion mechanism of Zn-Al-Mg-coated steel exposed to a simulated polluted marine environment.The experiments were carried out by scanning electron microscopy for micro-morphological characterization,X-ray diffraction,electrochemical impedance spectroscopy and electrodynamic polarization curves for the aged samples.The analysis of the results obtained after an indoor accelerated ageing test shows that Zn-Al-Mg coatings generate insoluble Zn5Cl2(OH)8·H2O and Zn4SO4(OH)6 during the corrosion process,which hinders the diffusion of corrosive substances into the substrate,and the insoluble substances are structurally dense and thus inhibit further corrosion.Therefore,this effectively inhibits the occurrence of further corrosion,and thus,Zn-Al-Mg coating can significantly extend the service life of Zn-Al-Mg-coated steel.
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    Microstructure and microtexture evolution characteristics of a powder metallurgy Ni-based superalloy during static recrystallization

    Zhi-qiang LiDe-cheng WangYue-wen ZhaiChao Jiang...
    2308-2325页
    查看更多>>摘要：Static recrystallization(SRX)characteristics of a powder metallurgy superalloy were investigated by isothermal com-pression at 1080-1170℃ under strain rates of 0.01-0.1 s-1,strains of 0.1,0.22,or 0.5,and holding time of 0-300 s.The impacts of temperature,strain rate,holding time,and strain on the SRXed grain size,volume fraction,and microtexture were explored by electron backscatter diffraction technique.It was found that temperature played a key role in these processes.As SRX progressed,the＜110＞fiber parallel to the axis compression direction gradually weakened and was replaced by the＜001＞fiber because＜001＞was the preferred recrystallization orientation and grain growth direction for the Ni-based superalloy.Moreover,high temperatures and low strain rates promoted the formation of the＜001＞fiber.Three nucleation mechanisms during SRX process were found:grain boundary bulging,primary twin assistance,and subgrain coalescence.Grain boundary bulging occurred under all process conditions;however,at low temperatures and high strain rates,the latter two mechanisms could provide additional nucleation modes.In addition,SRX size and volume fraction models were established.
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