WC的粒度对WC-Co硬质合金断裂韧性的影响

EFFECT OF WC PARTICLE SIZE ON WC-Co CEMENTED CARBIDES FRACTURE TOUGHNESS

用压痕法测定了具有不同粒度硬质相的 WC- Co硬质合金的断裂韧性。结果发现 ,当钴含量不变时 ,硬质合金的断裂韧性随 WC粒度的增大而增大。进一步分析表明 :产生上述现象的主要原因是因为 WC晶体只有 4个独立滑移系 ,随 WC粒度的增大 ,其对裂纹的偏转和分叉作用增强 。

The effect of WC particle size on WC-Co cemented carbides fracture toughness was studied based on Palmqvist indentation toughness measurements. It was revealed that,when the cobalt content kept constant,the fracture toughness increased with the increase of WC particle size. A simple analysis shows that there are only four independent slip systems in WC. With the increase of WC particle size, its crack deflecting and branching effect increases, which elevates toughness by increasing the area of fracture surface.