本文通过对疲劳变形试样的扫描和透射电镜观察,探讨了WC-Co系硬质合金中微裂纹形核过程及其与微结构的关系,说明了WC晶粒中运动位错与亚晶界及WC/WC晶界的交割,以及位错在两种内界面附近的堆积是微裂纹形核的起因。减小WC的亚结构尺寸有利于提高合金的使用性能。
The initiation of microcracks and its connection with microstructure of WC-Co hardmetals have been studied by STEM. The microcracks in specimens are induced by high-frequency compressive fatigue. The causes of microcrack initiation are explained by traverse of slipping dislocations across sub-grain and WC/WC grain boundaries and the pile-up of dislocations near the boundaries. The reduction of substructure dimension is required to improve the alloy quality.
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