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Influence of the crystalline orientations on microcrack initiation in low-cycle fatigue

机译：低循环疲劳中晶体取向对微裂纹萌生的影响

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摘要

Present study aims at analyzing the crack initiation in an austenitic stainless steel in low-cycle fatigue. A fatigue test was carried out using a polished specimen. The surface of the specimen was observed in situ during the fatigue test, in order to establish the time of slip activity or crack initiation. After a number of cycles sufficient to initiate small cracks, the test was stopped and the surface observed by scanning electron microscopy. The electron backscattered diffraction technique (EBSD) was used to identify the orientations of surface grains in the central zone of the fatigue specimen. Crack-initiation sites and slip systems associated to the initiated microcracks were identified. The criterion of the maximum Schmid factor explains two-thirds of the cracks initiated in slip systems; however if the favorably oriented slip band with respect to this criterion makes an angle of around 45° to the loading direction, a crack may initiate in another slip system.
机译：本研究旨在分析低循环疲劳下奥氏体不锈钢的裂纹萌生。使用抛光的样品进行疲劳测试。在疲劳测试过程中就地观察了试样的表面，以确定滑动或裂纹萌生的时间。在足以引发小裂纹的多个循环之后，停止测试，并通过扫描电子显微镜观察表面。电子背散射衍射技术（EBSD）用于确定疲劳试样中心区域中表面晶粒的取向。确定了与引发的微裂纹相关的裂纹产生部位和滑动系统。最大施密特因数的标准解释了滑移系统中三分之二的裂纹。但是，如果相对于此准则有利地定向的滑移带与加载方向成大约45°的角度，则可能会在另一个滑移系统中引发裂纹。

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