Enhancing fracture toughness of nanotwinned austenitic steel by thermal annealing

SCRIPTA MATERIALIA

卷:119

Article

Xiong, L.¹  You, Z. S.^1,2  Lu, L.¹ 

[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China

[2] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, 200 Xiaolingwei St, Nanjing 210094, Jiangsu, Peoples R China

关键词: Dynamic plastic deformation;    Austenitic stainless steel;    Nanotwins;    Fracture toughness;    Thermal annealing;   

DOI  :  10.1016/j.scriptamat.2016.03.024

来源: Elsevier

【 摘 要 】

The fracture behavior was investigated of a 316L austenitic stainless steel with heterogeneously distributed nanotwin bundles, prepared by dynamic plastic deformation and subsequent annealing at different temperatures. The results indicate that the controlled annealing causes a slight decrease in the strength, but remarkably improves the fracture resistance, and therefore enhances the strength-toughness synergy. The toughness enhancement is attributable to the formation of recovered sub-micron-sized and recrystallized micron-sized grains postponing crack nucleation and to the remnant nanotwin bundles arresting crack propagation. (C) 2016 Published by Elsevier Ltd.

【 授权许可】

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