Effects of nanostructural hierarchy on the hardness and thermal stability of an austenitic stainless steel

被引：16
作者：
Jiang, Wei [1 ]
Cao, Yang [1 ]
Jiang, Yingda [2 ]
Liu, Yanfang [1 ]
Mao, Qingzhong [1 ]
Zhou, Hao [1 ]
Liao, Xiaozhou [3 ]
Zhao, Yonghao [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
[2] Shenyang Ligong Univ, Sch Mat Sci & Engn, Shenyang 110159, Peoples R China
[3] Univ Sydney, Sch Aerosp Mech & Mechatron Engn, Sydney, NSW 2006, Australia
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2021年 / 12卷
基金：
澳大利亚研究理事会; 中国国家自然科学基金;
关键词：
Steels; Thermal stability; Severe plastic deformation; Twinning; Mechanical properties; HIGH-PRESSURE TORSION; GRAIN-SIZE STABILIZATION; MICROSTRUCTURAL EVOLUTION; DEFORMATION; CU; STRENGTH; PRECIPITATION; PARTICLES; DUCTILITY; BEHAVIOR;
D O I：
10.1016/j.jmrt.2021.02.100
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An austenitic stainless steel was processed by high-pressure torsion, and formed a hierarchical nanostructure with ultrafine grains, ultrafine-precipitates, nano-twins and high densities of dislocations. As a result, the hierarchical nanostructure contributes collectively to the double hardness value of the austenitic stainless steel (514 +/- 44 HV) in comparison to the coarse-grained counterpart (217 +/- 11 HV). Both the nanostructural hierarchy and high hardness can be maintained at the temperatures up to similar to 600 degrees C. Annealing treatment at temperatures from 400 to 600 degrees C may induce recovery to the hierarchical nanostructure, resulting in a reduced microstructural heterogeneity and increased hardness for the high-pressure torsion processed steel. (C) 2021 The Authors. Published by Elsevier B.V.
引用
收藏
页码：376 / 384
页数：9
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