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EBSD investigation of the crystallographic features of deformation-induced martensite in stainless steel

Journal of Materials Science & Technology 2021年第10期69卷 148-155页

作者： Jinliang Wang Minghao Huang Jun Hu Chenchong Wang Wei Xu State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

Variant selection during the martensitic transformation in steels may play an important role in determining the transformation kinetics and the resulting mechanical *** this study,the variant selection and crystallographic features of deformation-induced martensite were investigated by quasi in situ electron backscatter diffraction(EBSD) in grade SUS321 during tensile *** differences in variant selection between austenite(γ)→hcp-martensite(ε)→bcc-martensite(α’) and γ→α’transformation routes were observed and reported in detail,which demonstrated that s-martensite plays an important role in the variant selection of α’.Variant selection at diffe rent deformation stages was also analysed and revealed that α’ variants with the highest priority and variant pairs were preferred at the initial and last deformation stages in the γ→ε→α’sequence,***,the single α’ variant nucleated at the thin slip band keeps its crystallography feature upon further deformation in the γ→α’*** addition,the strain work of the martensitic transformation for applied loads was quantitatively estimated to explain the variant selection and associated *** these calculations are compared to the experimental results it is found that they are not able to predict which α’ variant is forming pre ferentially during either during the γ→α’ or the ε→α’ sequences,while only accurate predictions are obtained for the γ→ε-transformation which indicates that the γ→α’ variant selection is more complex.

关键词： deformation-induced martensitic transformation Austenitic steels Variant selection Crystallographic orientation

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Effects of Al addition and cryogenic cyclic treatment on impact toughness of phase-transformable Ti-based bulk metallic glass composites

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Journal of Materials Science & Technology 2023年第9期140卷 210-220页

作者： Tingyi Yan Long Zhang R.Lakshmi Narayan Jingyu Pang Yi Wu Huameng Fu Hong Li Upadrasta Ramamurty Haifeng Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Materials Science and Engineering Indian Institute of Technology DelhiHauz KhasNew Delhi 110016India Department of Mechanical and Aerospace Engineering in Nanyang Technological University Singapore 637331Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A∗STAR)Singapore 138634Singapore

Developing bulk metallic glass composites(BMGCs)with high toughness is vital for their practical ***,the influence of different microstructures on the impact toughness of BMGCs is still *** effects of Al addition and cryogenic cyclic treatment(CCT)on the Charpy impact toughness,a K,at 298 and 77 K of a series of phase-transformable BMGCs are investigated in this *** is found that deformation-induced martensitic transformation(DIMT)of theβ-Ti dendrites is the dominant toughening mechanism in the phase-transformable BMGCs at 298 K,but at 77 K,the toughness of BMGCs is primarily determined by the intrinsic toughness of the glass *** addition of Al can moderately tune theβ-Ti phase stability,which then affects the amount of DIMT and impact toughness of the BMGCs at 298 ***,at 77 K,Al addition causes a monotonic decrease in the toughness of the BMGCs due to the embrittlement of the glass *** is found that CCT can effectively rejuvenate the phase-transformable BMGCs,which results in an enhanced impact toughness at 298 ***,the toughness at 77 K monotonously decreases with increasing the number of CCT cycles,suggesting that the rejuvenation of the glass matrix affects the toughness at both 298 and 77 K of BMGCs,but in dramatically different *** findings reveal the influence of microstructures and CCT on the impact toughness of BMGCs and provide insights that could be useful for designing tougher BMGs and BMGCs.

关键词： Bulk metallic glass composites Charpy impact toughness deformation-induced martensitic transformation Metastability Thermal cycling rejuvenation

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