Control of grain boundary connectivity based on fractal analysis for improvement of intergranular corrosion resistance in SUS316L austenitic stainless steel
Control of grain boundary connectivity based on fractal analysis for improvement of intergranular corrosion resistance in SUS316L austenitic stainless steel
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DOI：
10.1016/j.actamat.2015.08.075
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发表时间：
2016-01-01
期刊：
影响因子：
9.4
通讯作者：
Watanabe, Tadao
中科院分区：
文献类型：
--
作者：
Kobayashi, Shigeaki;Kobayashi, Ryosuke;Watanabe, Tadao
基于对SUS316L不锈钢晶界微观结构的分形分析，研究了高能随机晶界的连通性，证明了精细晶界工程（GBE）方法对于更精确地预测和控制多晶材料晶间腐蚀的有效性。研究发现，SUS316L不锈钢试样中随机边界网络的最大连通度（简称最大随机边界连通度）具有分形性质。MRBC的分形维数随着随机边界分数的减小而减小，或者换句话说，随着低能低σ重合位晶格（CSL）边界分数的增加而减小。较低的晶粒尺寸分布的变异系数表明更均匀的晶粒结构，被发现导致在较低的分形维数的试样具有类似的晶界特征分布（GBCD）的MRBC。根据不同晶界组织的MRBC分形分析结果，探讨了提高SUS316L不锈钢抗晶间腐蚀性能的最佳晶界组织。(C)2015 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
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.