Control of grain boundary connectivity based on fractal analysis for improvement of intergranular corrosion resistance in SUS316L austenitic stainless steel

被引：169
作者：
Kobayashi, Shigeaki [1 ]
Kobayashi, Ryosuke [1 ]
Watanabe, Tadao [2 ]
机构：
[1] Ashikaga Inst Technol, Fac Engn, Dept Innovat Engn, Div Mech & Elect Engn, Ashikaga, Tochigi 3268558, Japan
[2] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Shenyang 110004, Peoples R China
来源：
ACTA MATERIALIA | 2016年 / 102卷
基金：
日本学术振兴会;
关键词：
Grain boundary connectivity; lntergranular corrosion; Fractal analysis; Grain boundary engineering; Austenitic stainless steel; SITE LATTICE BOUNDARIES; CHARACTER-DISTRIBUTION; BRITTLE-FRACTURE; CREEP; POLYCRYSTALS; CRACKING; SURFACES; DUCTILE; STRESS; DIMENSION;
D O I：
10.1016/j.actamat.2015.08.075
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The connectivity of high energy random boundaries was investigated on the basis of the fractal analyses of grain boundary microstructures in SUS316L stainless steel, to prove the usefulness of a refined approach to grain boundary engineering (GBE) for more precise prediction and control of intergranular corrosion in polycrystalline materials. It was found that the maximum connectivity for random boundary network, termed the maximum random boundary connectivity (MRBC) had a fractal nature in the studied specimens of SUS316L stainless steel. The fractal dimension of MRBC tended to decrease with decreasing fraction of random boundaries, or in other words with increasing fraction of low-energy low-Sigma coincidence site lattice (CSL) boundaries. The lower coefficient of variation of grain size distribution suggesting a more homogeneous grain structure, was found to result in the lower fractal dimension of MRBC for the specimens with a similar grain boundary character distribution (GBCD). The optimum grain boundary microstructure for enhanced intergranular corrosion resistance in the SUS316L stainless steel was discussed based on the results from the fractal analyses of MRBC for different grain boundary microstructures. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：397 / 405
页数：9
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