Mechanical performance and deformation mechanisms of ultrastrong yield strength Fe-Cr-Ni-Mn-N austenitic stainless steel at 4.2 Kelvin

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外文摘要：We report the mechanical performance and microstructural characteristics of a Fe-Cr-Ni-Mn-N alloy at cryogenic temperatures.The exceptionally high yield strength of 1.5 GPa combined with a high strain-hardening rate and no deterioration in ductility at 4.2 K was displayed.The evolution of deformation mi-crostructure was examined using electron backscatter diffraction(EBSD),the transmission Kikuchi diffrac-tion(TKD),high-resolution transmission electron microscopy(HRTEM),and aberration-corrected scanning TEM(STEM).The deformation microstructure mainly consisted of dislocation slip with L-C locks,{111}stacking fault formation,{111} deformation nanotwinning,and FCC → HCP shear transformation at 4.2 K.The occurrence of FCC-HCP shear transformation inside/near {111} twins to form γ-γtw-ε dual-phase structure induces a dynamic Hall-Petch effect that promotes the strain-hardening rate and enhances the strength-ductility combination.We believe that this alloy displays outstanding damage tolerance through a progressive synergy of deformation mechanisms leading to exceptional strength which provides a new insight into the commercialized development of high-performance alloys for cryogenic applications.

外文关键词：

Fe-Cr-Ni-Mn-N alloyCryogenic temperatureMechanical propertiesTwinningPhase transformation

作者：

Jijun Xin、Hengcheng Zhang、Bingkun Lyu、Panyi Liang、Mebrouka Boubeche、Fuzhi Shen、Wei Wang、Wentao Sun、Li Shi、Ruinan Ma、Xinran Shan、Chuanjun Huang、Laifeng Li

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作者单位：

Songshan Lake Materials Laboratory,Dongguan 523808,China

State Key Laboratory of Technologies in Space Cryogenic Propellants(Technical Institute of Physics and Chemistry,Chinese Academy of Sciences),Beijing 100190,China

HBIS Group ZhangXuan Technology,Zhangjiakou 075100,China

State Key Laboratory of Technologies in Space Cryogenic Propellants,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaKey Program of the Chinese Academy of SciencesGuangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research FoundationGuangdong Province Youth Top Talent ProgramScientific Instrument Developing Project of Chinese Academy of Sciencesfund of the State Key Laboratory of Technologies in Space Cryogenic Propellants

项目编号：

52071223520071862022YFA16039042022YFB3804003ZDRW-CN-2021-2-4-12020B15151200842021A15151102992021TQ06C118YJKYYQ20200070E2AWB10401

出版年：

2024

DOI：

10.1016/j.jmst.2023.12.027

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.189(22)