Effect of High-Density Electric Current on the Microstructure and Fatigue Crack Initiation of Stainless Steel
Effect of High-Density Electric Current on the Microstructure and Fatigue Crack Initiation of Stainless Steel
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DOI：
10.2320/matertrans.m2013198
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发表时间：
2013-11-01
影响因子：
1.2
通讯作者：
Ju, Yang
中科院分区：
文献类型：
--
作者：
Tang, Yongpeng;Hosoi, Atsushi;Ju, Yang
为了研究高密度电流对疲劳裂纹萌生延迟的影响，利用透射电子显微镜研究了施加电流前后的位错结构。对施加电流前后的位错密度进行了定量表征，以进一步了解愈合效应的机制。原子力显微镜结果表明，试样表面的滑移局部消失，滑移高度降低。此外，通过考虑位错密度累积的疲劳裂纹萌生模型评估了施加电流对裂纹萌生的延迟效应。
To investigate the effect of high-density electric current on the delay of fatigue crack initiation, the dislocation structures before and after the application of electric current were investigated by transmission electron microscopy. Dislocation density was quantitatively characterized before and after the application of electric current to further understand the mechanics of the healing effect. Atomic force microscope results showed that the slips disappeared locally and the slip height decreased on the surface of the specimens. Furthermore, the delaying effect of the crack initiation due to the application of electric current was evaluated by the fatigue crack-initiation model in which the accumulation of the dislocation density was considered.