Enhanced mechanical properties and corrosion resistance of 316L stainless steel by pre-forming a gradient nanostructured surface layer and annealing

被引：140
作者：
Lei, Y. B. [1 ]
Wang, Z. B. [1 ]
Zhang, B. [1 ]
Luo, Z. P. [1 ]
Lu, J. [2 ]
Lu, K. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Peoples R China
[2] City Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
来源：
ACTA MATERIALIA | 2021年 / 208卷
基金：
中国国家自然科学基金;
关键词：
Gradient nanostructured; Surface mechanical rolling treatment; 316L stainless steel; Mechanical property; Corrosion resistance;
D O I：
10.1016/j.actamat.2021.116773
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Stainless steels with high mechanical properties and corrosion resistance are promising structural materials for the next generation of aerospace and some niche industries. In this work, we pre-formed a gradient nanostructured (GNS) surface layer on 316L stainless steel by surface mechanical rolling treatment (SMRT) and subsequently annealed it at 700 degrees C. Tensile tests showed that the strength-ductility synergy was enhanced in the annealed-SMRT sample, while the grain size and hardness in the GNS layer retained rather stable. In addition, a remarkable Cr-enrichment was found in the GNS surface layer after annealing, resulting in a significantly enhanced corrosion resistance. The underlying mechanisms on the microstructure, composition and phases evolutions, as well as their effects on deformation and corrosion behavior, were analyzed in the annealed-SMRT sample. This work provides insights on developing a simple thermomechanical approach to produce stainless steels with enhanced mechanical properties and corrosion resistance. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：11
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