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martensite transformation induced by deformation and its phase electrochemical behavior for stainless steels AISI 304 and 316L

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Journal of University of Science and Technology Beijing 2002年第6期9卷 437-440页

作者： BaofengDing SalihHmidaAbubakir 等 BeijingKeyLaboratoryforCorrosion ErosionandSurfaceScienceBeijing100083China MaterialsScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China

The martensite transformation induced by tensile elongation and its effect onthe behavior of phase electrochemistry of AISI 304 and 316L in 3.5% NaCl solution were studied. Theresults show that the content of α′-martensite in stainless steel 304 increases with the truestrain. As α′-martensite content increased, free corrosion potential and pitting potential ofstainless steel 304 in 3.5% NaCl solution appeared the change trend of a minimum. It was also foundthat pitting nucleated preferentially at the phase interfaces between martensite and *** existed apparent difference between electrochemical properties of austenite and of martensitefor stainless steel 304 and 316L in 3.5% NaCl solution.

关键词： austenite stainless steel martensite transformation phaseelectrochemistry pitting corrosion

martensite transformation and Its Control in DP,TRIP and TWIP Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 200-207页

作者： LI Lin 1,GAO Yi 2,SHI Wen 1,LIU Ren-dong 2,HE Yan-lin 1,FU Ren-yu 1,ZHANG Mei 1,WANG Hua 1 (1.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China 2.Ansteel Company,Anshan 114001 China Corresponding Author:School of Materials Science and Engineering,Shanghai University,P.O.Box 15,149 Yanchang Road,Shanghai 200072,China) Shanghai Univ Sch Mat Sci & Engn Shanghai 200072 Peoples R China Ansteel Co Anshan 114001 Peoples R China

Designing of alloy concept and process for DP,TRIP and TWIP steels stressing at martensite transformation are *** DP steel,austenite volume percent and its carbon content at different intercritical temperatures are calculated as well as the tensile strength of the steel,which meet well with the experimental *** condition for dissolution of carbide is discussed by experiments and predicted by kinetic *** sample TRIP steels are prepared and their concentration profiles are calculated showing different diffusion characteristics of *** also shows carbon enrichment is successful in this stage through the quick diffusion of carbon from ferrite to *** order to maintain the austenite stability or to prevent precipitation of cementite,minimum cooling rate from the intercritical zone to over aging stage is obtained through kinetic *** transformation is estimated,which indicates the carbon rerichment from ferrite of bainite structure to austenite in this stage is also *** HCP martensite transformation and the strain induced martensite transformation in TWIP steel is *** between transformation and mechanical properties in the steel is also mentioned.

关键词： martensite transformation DP TRIP and TWIP steels thermal HCP martensite transformation

Effect of Cu on martensite transformation of CoCrMo alloy for biomedical application

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Journal of Materials Science & Technology 2020年第17期52卷 127-135页

作者： Ruoxian Wang Gaowu Qin Erlin Zhang School of Materials Science and Engineering Key Lab.for Anisotropy and Texture of MaterialsEducation Ministry of ChinaNortheastern UniversityShenyang110819China

The martensite transformation of Co-29Cr-6Mo-xCu(Co-xCu,x=0,1.5,2,4,wt%)alloys was investigated in order to explore ductile Co-based alloy without Ni for biomedical *** effect of Cu on martensite transformation of Co-29 Cr-6 Mo alloy was investigated using scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-Ray diffraction(XRD)and electron backscatter diffraction(EBSD)*** results revealed that the fraction ofγ-phase was increasing with increasing of copper *** detail,the fraction ofγ-phase of aged Co-1.5 Cu alloy was 4.72%and noγ-phase was found in aged Co-0Cu ***,the fraction ofγ-phase of aged Co-2Cu alloy and Co-4Cu alloy was 51.68%and 46.17%,*** demonstrated that the minimum Cu content which could inhibit martensite transformation in this alloy system was 2 wt%.Calculated phase diagram revealed that increasing the copper content of this alloy system could enlargeγ-phase zone,which means Cu could inhibit the formation ofγ-phase and consequently stabilizeγ-*** distributed Cu-rich phase was identified in aged Co-4Cu *** possible reason for the inhibition of martensite transformation by Cu addition is that alloying with Cu atom might decrease charge accumulations and increase atomic bonds,which increase the stacking fault energy ultimately.

关键词： Biomaterials Co-based alloy Cu addition Precipitation martensite transformation

Deformation at Room and Low Temperatures and martensite transformation in Resistance Spot Welding Duplexγ&α(δ) Materials of 301L Stainless Steel

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Journal of Materials Science & Technology 2007年第3期23卷 319-322页

作者： Wei LIU Jun HE Meng FAN Peide LU Li SHAO School of Mechanical and Electronic Control Engineering Beijing Jiao Tong University Beijing 100044 China Changchun Rail Car Corporation Changchun 130062 China

transformation induced plasticity （TRIP） and twinning induced plasticity （TWlP） effects had been widely studied in single austenite steel. But in duplex γ ＆ α（δ） phase, such as welding materials of stainless steel, they had been less studied. Tensile shear loading experiment of resistance spot welding specimens prepared with 2 mm 301L sheets, was carried out at 15℃ and -50℃. Optical microscopy and scanning electron microscopy （SEM） as well as X-ray diffraction （XRD） were used to investigate the microstructure of weld nugget, and specimens fracture surface. The results showed that the initial weld nugget was composed of 8.4% α（δ） ferrite and 91.6% austenite. Tensile shear load bearing capacity of spot welding specimen at -50℃ was 24.8 kN, 17.7% higher than that at 15℃. About 78.5 vol. pct. martensite transformation was induced by plastic deformation at -50℃, while about 67.9 vol. pct transformation induced at 15℃. The plasticity of spot welding joint decreased with the decline of experimental temperature.

关键词： 301L stainless steel Resistance spot welding Duplex γ & α(δ) Plastic deformation martensite transformation

Features of Electroplastic Effect in Alloys with martensite transformation

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Acta Metallurgica Sinica(English Letters) 2018年第12期31卷 1305-1310页

作者： Vladimir Stolyarov Mechanical Engineering Research Institute RussianAcademy of SciencesM.Kharitonievsky4MoscowRussia 101990 National Research Nuclear University MEPhI MoscowRussia

Influence of different electric current modes （pulse and direct） on occurrence of the electroplastic effect under uniaxialtension in the coarse-grained alloys with martensite transformations is investigated. The materials are shape memoryTi49.3Niso.7 alloy and metastable austenite transformation-induced plasticity （TRIP） steel. The paper contains experimentalresults of current impact on the ＂stress-strain＂ curves of the material. It has been taken an experimental measurement ofthe sample temperature during the test. It is shown that the shape of a stress-strain curves and type of the serrate plasticflow, connected with the martensitic transformation and electroplastic effect, depend on the current modes. Impact of pulsecurrent and direct current suppresses shape memory and TRIP effect.

关键词： Electroplastic effect TRIP effect Pulse current Deformation martensite transformation Tension

Effects of Applied Stresses on martensite transformation in AISI4340 Steel

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Journal of Iron and Steel Research International 2007年第6期14卷 63-67页

作者： ZHAO Hong zhuang Seok-jae LEE Young-kook LEE LIU Xiang-hua WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Department of Metallurgical Engineering Yonsei University Seoul 120-749 South Korea

This study aims at the experimental analysis of the transformation induced plasticity （TRIP） phenomenon. Experiments are conducted in which martensite is allowed to grow under the influence of a series of externally applied stresses. The magnitude of the applied stresses is less than 67% of the yield strength of austenite σγ （Ts）. Since there is no obvious difference between the transformation plasticity under tension and the compression for the lower applied stresses, only compressive stresses are applied. The results confirm that the transformation plasticity is proportional to the applied stress if the latter does not exceed 67 % of σγ （Ts）. The TRiP-strain, the kinetics, and their dependence on the applied stresses are studied. The comparison between calculated results and experimental results shows that the model accurately describes the phenomenon.

关键词： applied stress TRIP martensite transformation low-alloy steel

Thermodynamic Analyses of Strain-induced martensite transformation in Fe-7Mn-1.2C Alloy

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Journal of Materials Science & Technology 2000年第4期16卷 449-451页

作者： Xie, JP Zhu, YM Wang, XY Luoyang Inst Technol Grad Div Luoyang 471039 Peoples R China

The M-s temperature, Delta G(gamma-->alpha), Delta G(gamma-->M) and mechanical energy under a non-severe impact loading in a medium manganese steel (Fe-7Mn-1.2C) have been calculated by means of Xu's Fe-X-C model. The relation between the yield strength of austenite and the driving force for martensite transformation has been established. It is proved that the martensite transformation can take place in a medium manganese steel (Fe-7Mn-1.2C alloy) under a non-severe impact loading.

关键词： martensite transformation manganese steel impact loading the driving force mechanical energy Ms temperature strength of

Effects of Pulsed Current and Pulsed Magnetic Field Complex Pretreatment on martensite transformation of Cr5Steel during Continuous Cooling

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Journal of Iron and Steel Research International 2015年第12期22卷 1131-1137页

作者： Qing-chun LI Li-juan LI Guo-wei CHANG Qi-jie ZHAI School of Materials Science and Engineering Liaoning University of Technology School of Materials Science and Engineering Shanghai University

Carbide precipitation and martensite transformation in Cr5 steel have been observed in situ by high-temper- ature confocal laser-scanning microscopy. In this way, the influences of pulsed current and pulsed magnetic field complex pretreatment on carbide precipitation and martensite transformation during continuous cooling have been studied. The results show that the electropulsing complex pretreatment promotes the precipitation of M7 C3-type car- bides at high temperature, increases the start and finish temperatures of martensite transformation, and extends the phase transformation time. martensite prefers to nucleate in the austenite with less precipitation of carbides due to the chemically homogeneous distribution of solute atoms.

关键词： pulsed current pulsed magnetic field pretreatment martensite transformation

martensite transformation and Its Control in DP,TRIP and TWIP Steels

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Martensite Transformation and Its Control in DP,TRIP and TWI...