Electron channeling contrast imaging of dislocation structures in fatigued austenitic stainless steels
Electron channeling contrast imaging of dislocation structures in fatigued austenitic stainless steels
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DOI：
10.1016/j.msea.2005.01.075
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发表时间：
2005-07
期刊：
影响因子：
6.4
通讯作者：
Y. Kaneko;K. Fukui;S. Hashimoto
中科院分区：
文献类型：
--
作者：
Y. Kaneko;K. Fukui;S. Hashimoto
用电子沟道衬度成像技术分析了疲劳奥氏体不锈钢多晶的位错结构。在一些颗粒中发现了持续滑移带(PSB)和脉状结构的形成。考察了晶粒度和施密德因子对PSB形成的影响。添加PSBs的颗粒平均直径大于不含PSBs的颗粒平均直径。而施密德因子在施密德因子上的平均值在施密德因子上与其他籽粒没有显著差异。即使在施密德因子较低、颗粒直径较小的颗粒中也能检测到PSB的形成。结果表明，相邻晶内堆积位错引起的应力集中是这种晶界形成PSB的原因之一。
Dislocation structures of fatigued austenitic stainless steel polycrystals were analyzed by electron channelling contrast imaging. The formation of persistent slip bands (PSBs) and vein structures were recognized in some grains. Effects of both grain size and Schmid factor on the PSB formation were investigated. The average diameter of the grains containing PSBs was higher than that without PSBs. On the other hand, there was no significant difference in the average Schmid factor between the grains with PSBs and the other grains. PSB formations was detected even in grains, where the Schmid factor was low, and the grain diameter was small. It was proposed that the stress concentration coming from piled-up dislocations in a neighboring grain was one of the reasons for the PSB formation in such grains.