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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。
In this paper, the scanning electron microscopy and scanning electron microscopy of fatigue specimens were used to investigate the micro-crack nucleation and the relationship between micro-cracks and the microstructure in WC-Co cemented carbide. The results show that the movement dislocations and subgrain boundaries And the delivery of WC / WC grain boundaries, as well as the accumulation of dislocations near the two interfacial boundaries are the cause of micro-crack nucleation. Reducing the size of WC sub-structure helps to improve the serviceability of the alloy.