Discontinuous surface cracks during stress corrosion cracking of stainless steel single crystal
Discontinuous surface cracks during stress corrosion cracking of stainless steel single crystal
复制标题
不锈钢单晶应力腐蚀开裂过程中的不连续表面裂纹
DOI：
10.1016/j.corsci.2011.06.019
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发表时间：
2011-11-01
影响因子：
8.3
通讯作者：
Li, X. Y.
中科院分区：
文献类型：
--
作者：
Qiao, L. J.;Gao, K. W.;Li, X. Y.
研究了单晶321不锈钢在42 wt.% MgCl（2）溶液。裂纹在最大拉伸应力平面内宏观扩展，而与相对于所施加拉伸载荷方向的缺口方向无关。一些应力腐蚀裂纹在两个滑移带的交汇处不连续地形核。然而，大多数裂纹与滑移带无关。观察到解理样断裂，河痕显示出沿{1 1 1}面沿着的微剪切刻面。主裂纹和不连续微裂纹之间的相互作用使计算的应力强度因子增加了17倍，并促进裂纹的合并，导致裂纹之间的韧带的机械断裂。(C)2011爱思唯尔有限公司保留所有权利。
Single crystal 321 stainless steel stress corrosion cracking was studied in a 42 wt.% MgCl(2) solution. Cracks propagated macroscopically in the maximum tensile stress plane regardless of the notch orientation with respect to the applied tensile load direction. Some stress corrosion cracks nucleated discontinuously at the intersection of the two slip bands. Most cracks, however, were not related to the slip bands. Cleavage-like fracture was observed, and the river-markings exhibited microshear facets along the {1 1 1} plane. Interaction between the main crack and the discontinuous microcracks increased the calculated stress intensity factor by 17 times and promoted crack coalescence, resulting in mechanical fracture of the ligaments between the cracks. (C) 2011 Elsevier Ltd. All rights reserved.