Heterostructure alleviates L?ders deformation of ultrafine-grained stainless steels

被引：19
|
作者：
Sun, Guosheng [1 ]
Liu, Jizi [1 ,2 ]
Zhu, Yuntian [3 ,4 ]
机构：
[1] Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China
[2] Nanjing Univ Sci & Technol, Mat Anal & Test Ctr, Nanjing 210094, Peoples R China
[3] City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Hong Kong 999077, Peoples R China
[4] City Univ Hong Kong, Mech Behav Div, Shenyang Natl Lab Mat Sci, Kowloon, Hong Kong 999077, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 848卷
关键词：
Stainless steel; Heterostructure; L?ders band; Strain delocalization; HDI hardening; MEDIUM MN STEEL; MICROSTRUCTURAL CHARACTERISTICS; LUDERS DEFORMATION; YIELDING BEHAVIOR; BACK STRESS; SHEAR BANDS; STRAIN; ELONGATION; DUCTILITY; EVOLUTION;
D O I：
10.1016/j.msea.2022.143393
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ultrafine-grained (UFG) 304 stainless steel is much stronger than its coarse-grained counterpart. However, it develops undesired Luders bands during deformation. Here we report a bi-modal heterostructure that can effectively suppress Luders deformation in the UFG 304 stainless steel, which produces a strong strain hardening to improve the ductility and toughness, without sacrificing much strength. These superior mechanical properties are attributed to strain delocalization capability of the bi-modal heterostructure, which results in lower stress concentration and consequently postpones the martensitic transformation.
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页数：5
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