Microstructural evolution of metastable austenitic steel during high-pressure torsion and subsequent heat treatment

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Chen, S.^1 ; Shibata, A.^1 ; Zhao, L.J.^1 ; Gao, S.^1 ; Tian, Y.Z.^1 ; Tsuji, N.^1

Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan^1

关键词: Deformation-induced martensite;    High pressure torsions;    Metastable austenite;    Metastable austenitic steels;    Processed materials;    Reverse Transformation;    Single phase austenite;    Transformation induced plasticity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012053/pdf
DOI  :  10.1088/1757-899X/63/1/012053

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Metastable austenite in a Fe-24Ni-0.3C (wt.%) alloy was processed by high-pressure torsion and subsequently heat-treated. The HPT-processed material had lamellae structures composed of highly deformed austenite and deformation-induced martensite. The reverse transformation of the deformation-induced martensite and recovery/recrystallization of the retained austenite completed above 500 °C and resulted in fully annealed and single-phase austenite with different grain sizes. The ultrafine-grained and nanocrystalline austenite showed high yield strength and large ductility due to transformation-induced plasticity.