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Roles of pre-formed martensite in below-Ms bainite formation,microstructure,strain partitioning and impact absorption energies of low-carbon bainitic steel

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Journal of Materials Science & Technology 2022年第1期96卷 69-84页

作者： Lihe Qian Zhi Li Tongliang Wang Dongdong Li Fucheng Zhang Jiangying Meng State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China Library of Yanshan University Yanshan UniversityQinhuangdao 066004China

The roles of pre-formed martensite(PM)in below-Ms bainite formation,microstructure,crystallography,strain partitioning and mechanical properties of a low-carbon bainitic steel were investigated using electron-backscattered diffraction,transmission electron microscopy,micro digital image correlation technique and mechanical *** is demonstrated that the pre-formation of martensite eliminates the incubation time for bainite transformation at various austempering temperatures below Ms,indicative of its acceleration effect at the early stage of *** effect is mainly attributed to the surfaces or tips of the PM acting as the nuclei of subsequently-formed bainite,with initial bainite tending to form around the ***,the finishing time for below-Ms bainite transformation,especially at even lower temperatures,is retarded,owing to the dividing effect of PM on parent austenite grains,the decreasing effect of lowered isothermal temperature on the diffusion rate of carbon atoms and the strengthening effect of lowered isothermal temperature on supercooled *** and its adjacent bainitic laths have nearly the same crystallographic orientation and belong to the same *** pre-formation of martensite largely refines the bainitic blocks/laths and retained *** specimens with PM show relatively uniform strain partitioning among various phases,contrasting with the specimens without PM,for which strains are highly concentrated in the bainite region nearby fresh martensite/austenite(M/A)blocks or between adjacent M/A *** impact absorption energies of the specimens with PM,when austempered at 30-60℃ below Ms,are more than twice higher than those of the specimens without PM,at no expense of tensile properties.

关键词： Bainite Martensite Impact toughness Transformation kinetics strain partitioning

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Hot deformation behavior of microstructural constituents in a duplex stainless steel during high-temperature straining

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International Journal of Minerals,Metallurgy and Materials 2013年第10期20卷 953-960页

作者： Amir Momeni Shahab Kazemi Ali Bahrani Materials Science and Engineering Department Hamedan University of Technology Department of Materials Engineering Faculty of EngineeringBu Ali Sina University

The hot deformation characteristics of 1.4462 duplex stainless steel （DSS） were analyzed by considering strain partitioning between austenite and ferrite constituents. The individual behavior of ferrite and austenite in microstructure was studied in an iso-stress condition. Hot compression tests were performed at temperatures of 800-1100~C and strain rates of 0.001-1 s-1. The flow stress was modeled by a hyperbolic sine constitutive equation, the corresponding constants and apparent activation energies were determined for the studied alloys. The constitutive equation and law of mixture were used to measure the contribution factor of each phase at any given strain. It is found that the contribution factor of ferrite exponentially declines as the Zener-HoUomon parameter （Z） increases. On the contrary, the austenite contribution polynomially increases with the increase of Z. At low Z values below 2.6. x 1015 （lnZ---35.5）, a negative contribution factor is determined for austenite that is attributed to dynamic recrystallization. At high Z values, the contribution factor of austenite is about two orders of magnitude greater than that of ferrite, and therefore, austenite can accommodate more strain. Microstructural characterization via electron back-scattered diffraction （EBSD） confirms the mechanical results and shows that austenite recrystallization is possible only at high temperature and low strain rate.

关键词： duplex stainless steel compression testing strain partitioning high temperature operations deformation

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Composition design of a novel Ti-6Mo-3.5Cr-1Zr alloy with high-strength and ultrahigh-ductility

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Journal of Materials Science & Technology 2022年第36期131卷 276-286页

作者： Kai Chen Qunbo Fan Jiahao Yao Lin Yang Shun Xu Wei Lei Duoduo Wang Jingjiu Yuan Haichao Gong Xingwang Cheng National Key Laboratory of Science and Technology on Materials Under Shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401135China

The strength-elongation to fracture(εf)trade-off and low strain hardening rate have been a longstanding dilemma in titanium *** this work,we innovatively manufactured a novel Ti-6Mo-3.5Cr-1Zr alloy via the introduction of a stress-induced strengthening phase into the ***-inducedω(SIω)phase transformation was expected to replace theα''martensitic transformation that resulted in the low yield strength of titanium *** obtained alloy exhibited an extremely high strain hardening rate of up to^1820 *** true peak tensile strength andεfreached^1242 MPa and^40%,*** intrinsic mechanisms underlying the simultaneous improvement of strength and ductility of the material were systematically investigated via in-situ and ex-situ ***-situ electron backscatter diffraction(EBSD)/digital image correlation(DIC)results showed that SIωphase transformation dominated the early stage of plastic deformation(1.5%–3%)and promoted the strain partitioning between the stress-induced bands andβ***,the formation of{332}βtwins andωtwins was observed via ex-situ ***-situ transmission electron microscopy results revealed that dislocation pile-up(DPU)occurred at the SIω/β*** coupling effects associated with the transformation induced plasticity(TRIP),twinning induced plasticity(TWIP),and DPU mechanisms contributed to the enhanced strength andεfof the designed titanium alloy.

关键词： Titanium alloy Mechanical properties Phase transformation Twinning strain partitioning

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Reconfiguring dual-phase structure with equal micro-hardness to achieve double strength with slight ductility sacrifice

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Journal of Materials Science & Technology 2023年第10期141卷 171-183页

作者： Xuebing Liu Mengcheng Zhou Xinfang Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 10083China

The application of duplex stainless steel is severely restricted owing to its inherently low yield strength.A high yield strength of duplex stainless steel is required to address the lightweight issues and re-duce the emission of polluting ***,excellent mechanical properties of duplex stainless steel were achieved using a flash annealing treatment to obtain austenite and ferrite phases with equal hard-ness,and the yield strength doubled without a substantial ductility *** improvement in yield strength was caused by the grain boundary strengthening(a contribution of 60%to the yield strength)and hetero-deformation-induced strengthening(remaining 40%contribution to the yield strength)owing to the significant difference in the strain partitioning between the two *** high strain-hardening capability ensured ductility without a significant decrease;this correlated to the multiple microstruc-ture deformation *** mechanisms included the synergetic deformation of the ferrite with dislocation cell formation and austenite accompanied by the sequential appearance of dislocation accumulation,stacking faults,and deformation-induced nanoscale twins and ***-induced multilevel stacking fault networks and high-density Lomer-Cotterll locks further improved the strain hardening response by enhancing the hetero-deformation behavior of austenite and ferrite.

关键词： Duplex stainless steel Flash annealing Equal hardness strain partitioning Hetero-deformation

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