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

Jijun Xin ¹Hengcheng Zhang ²Bingkun Lyu ¹Panyi Liang ¹Mebrouka Boubeche ¹Fuzhi Shen ²Wei Wang ¹Wentao Sun ²Li Shi ²Ruinan Ma ³Xinran Shan ²Chuanjun Huang ²Laifeng Li⁴

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作者信息

1. Songshan Lake Materials Laboratory,Dongguan 523808,China
2. State Key Laboratory of Technologies in Space Cryogenic Propellants(Technical Institute of Physics and Chemistry,Chinese Academy of Sciences),Beijing 100190,China
3. HBIS Group ZhangXuan Technology,Zhangjiakou 075100,China
4. 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
折叠

Abstract

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.

Key words

Fe-Cr-Ni-Mn-N alloy/Cryogenic temperature/Mechanical properties/Twinning/Phase transformation

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基金项目

National Natural Science Foundation of China(52071223)

National Natural Science Foundation of China(52007186)

National Key Research and Development Program of China(2022YFA1603904)

National Key Research and Development Program of China(2022YFB3804003)

Key Program of the Chinese Academy of Sciences(ZDRW-CN-2021-2-4-1)

Guangdong Basic and Applied Basic Research Foundation(2020B1515120084)

Guangdong Basic and Applied Basic Research Foundation(2021A1515110299)

Guangdong Province Youth Top Talent Program(2021TQ06C118)

Scientific Instrument Developing Project of Chinese Academy of Sciences(YJKYYQ20200070)

fund of the State Key Laboratory of Technologies in Space Cryogenic Propellants(E2AWB10401)

出版年

2024

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

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