Application of Grain Boundary Engineering to Improve Intergranular Corrosion Resistance in a Fe-Cr-Mn-Mo-N High-Nitrogen and Nickel-Free Austenitic Stainless Steel

被引：38

作者：

Shi, Feng ^{[1
]}

Gao, Ruo-Han ^{[1
]}

Guan, Xian-Jun ^{[1
]}

Liu, Chun-Ming ^{[2
]}

Li, Xiao-Wu ^{[1
,2
]}

机构：

[1] Northeastern Univ, Sch Mat Sci & Engn, Dept Mat Phys & Chem, Shenyang 110819, Peoples R China

[2] Northeastern Univ, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Peoples R China

来源：

ACTA METALLURGICA SINICA-ENGLISH LETTERS | 2020年 / 33卷 / 06期

基金：

中国国家自然科学基金;

关键词：

High-nitrogen and nickel-free austenitic stainless steel; Grain boundary engineering; Electron backscatter diffraction (EBSD); Low sigma coincidence site lattice boundary; Intergranular corrosion; CHARACTER-DISTRIBUTION; MECHANICAL-PROPERTIES; PITTING CORROSION; BEHAVIOR; PRECIPITATION; SUSCEPTIBILITY; SENSITIZATION; OPTIMIZATION; DEFORMATION; EVOLUTION;

D O I：

10.1007/s40195-020-01000-8

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Optimization of grain boundary engineering (GBE) process is explored in a Fe-20Cr-19Mn-2Mo-0.82 N high-nitrogen and nickel-free austenitic stainless steel, and its intergranular corrosion (IGC) property after GBE treatment is experimentally evaluated. The proportion of low sigma coincidence site lattice (CSL) boundaries reaches 79.4% in the sample processed with 5% cold rolling and annealing at 1423 K for 72 h; there is an increase of 32.1% compared with the solution-treated sample. After grain boundary character distribution optimization, IGC performance is noticeably improved. Only sigma 3 boundaries in the special boundaries are resistant to IGC under the experimental condition. The size of grain cluster enlarges with increasing fraction of low sigma CSL boundaries, and the amount of sigma 3 boundaries interrupting the random boundary network increases during growth of the clusters, which is the essential reason for the improvement of IGC resistance.

引用

页码：789 / 798

页数：10

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