Back stress strengthening and strain hardening in gradient structure

被引：1045

作者：

Yang, Muxin ^{[1
]}

Pan, Yue ^{[1
,4
]}

Yuan, Fuping ^{[1
]}

Zhu, Yuntian ^{[2
,3
]}

Wu, Xiaolei ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, 15 Beisihuan West Rd, Beijing 100190, Peoples R China

[2] North Carolina State Univ, Dept Mat Sci & Engn, Campus Box 7919, Raleigh, NC 27695 USA

[3] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, 200 Xiaolingwei, Nanjing 210094, Jiangsu, Peoples R China

[4] Tongji Univ, Sch Aerosp Engn & Appl Mech, 1239 Siping Rd, Shanghai 200092, Peoples R China

来源：

MATERIALS RESEARCH LETTERS | 2016年 / 4卷 / 03期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

Back Stress; Geometrically Necessary Dislocations; Work Hardening; Ductility; Gradient Structure; HYSTERESIS LOOPS; SURFACE-LAYER; GRAIN-SIZE; NANOCRYSTALLINE ALLOYS; METALLIC MATERIALS; MARTENSITIC STEEL; PART II; PLASTICITY; BEHAVIOR; TEMPERATURE;

D O I：

10.1080/21663831.2016.1153004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report significant back stress strengthening and strain hardening in gradient structured (GS) interstitial-free (IF) steel. Back stress is long-range stress caused by the pileup of geometrically necessary dislocations (GNDs). A simple equation and a procedure are developed to calculate back stress basing on its formation physics from the tensile unloading-reloading hysteresis loop. The gradient structure has mechanical incompatibility due to its grain size gradient. This induces strain gradient, which needs to be accommodated by GNDs. Back stress not only raises the yield strength but also significantly enhances strain hardening to increase the ductility. [GRAPHICS] .

引用

页码：145 / 151

页数：7

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