Secondly, the microscopic features (especially micro hardness and micro crack) of surface degenerating layer of EDM are deeply investigated.
其次,对电火花加工表面变质层显微特性进行了研究,特别是对变质层显微硬度和显微裂纹进行了深入的研究。
参考来源 - 混粉电火花加工表面特性分析·2,447,543篇论文数据，部分数据来源于NoteExpress
GH105合金冷拉棒表面存在的碎晶层和其内部的显微裂纹是热处理裂纹源。
It is suggested that the broken crystal layer and microcracks in surface layer of the cold drawn rod is the source of the heat treatment induced cracks.
在热处理过程中由于热应力和组织应力的作用，导致划伤部位产生大量的显微裂纹。
A number of microcracks are produced around the scratched place because of the thermal stress and structural stress in the process of heat treatment.
表面碳势为1.1%C的渗碳硬化层内，临近外表面部位的枣核马氏体中会出现显微裂纹。
When carburized under high carbon potential (1. 1% C), microcracks tend to appear on the martensitic matrix near the outer surface of the layer.
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