Fracture behavior of heterogeneous nanostructured 316L austenitic stainless steel with nanotwin bundles

被引：82

作者：

Xiong, L. ^{[1
]}

You, Z. S. ^{[2
]}

Qu, S. D. ^{[2
]}

Lu, L. ^{[1
]}

机构：

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

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

来源：

ACTA MATERIALIA | 2018年 / 150卷

基金：

美国国家科学基金会;

关键词：

Austenitic stainless steel; Nanotwins; Fracture toughness; Crack bridging; Strength-toughness synergy; DYNAMIC PLASTIC-DEFORMATION; TOUGHNESS; STRENGTH; DUCTILITY; MECHANISMS; COPPER; CU;

D O I：

10.1016/j.actamat.2018.02.065

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The fracture behavior was investigated of a bulk nanostructured 316L austenitic stainless steel with embedded nanotwin bundles incorporated by dynamic plastic deformation. The nanotwin bundles were demonstrated to be critical to strengthen and toughen the as-deformed samples with mixed microstructures of nano-grains and nano-twins. With increment in strength, the fracture toughness decreases due to the generation of increasingly more nano-grains. Additional controlled thermal annealing that makes the nano-grains recover or recrystallize leads to reduced strengths but more remarkably improved fracture toughness. The enhanced strength fracture toughness synergy can be attributed to the nano twin bundles that constrict the damage development in the matrix of either nano-grains or recrystallized grains, and that resist crack propagation via acting as ductile crack bridging ligaments. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：130 / 138

页数：9

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