WC-Co硬质合金热处理后的TEM观察

TEM Investigation of WC-Co Cemented Carbides after Heat Treatment

对ＹＧ１１Ｃ和ＹＧ１３Ｃ两种牌号硬质合金热处理后的微观组织进行了ＴＥＭ分析。通过电子衍射花样的标定，确认了ＣｏｘＷｙＣｚ物相在淬火回火所得到的面心立方钴（α－Ｃｏ）中的存在，并结合硬质合金热处理前后抗弯强度的测定，对该类物相在面心立方钴中的作用进行了初步探讨。结果表明：ε－Ｍ，Ｃｏ３Ｗ，Ｃｏ７Ｗ６，κ－Ｃｏ３Ｗ９Ｃ４等物相在热处理后的硬质合金中可起到强化作用。

Speciments of YG11C and YG13C cemented carbides were subjected to various heat treatments. The structures of the specimens were analyzed by transmission electron microscopy (TEM) The existences of Co[HTK〗xW[HTK〗yC[HTK〗zphases were ascertained by electron diffraction Their effects on fcc cobalt were discussed in terms of the transverse rupture strengths of the cemented carbides before and after the heat treatment The results show after heat treatment the ε-M, Co3W,Co7W6 and κ-Co3W9C4 phases may strengthen the fcc cobalt in the alloys, thereby improving the transverse rupture strength of the cemented carbides