采用动态热模拟技术研究稀土对硬质合金性能稳定性的影响

THE EFFECT OF RARE-EARTH ELEMENTS ON THE STABILITY OF THE STRUCTURE AND THE MECHANICAL PROPERTIES OF HARD METALS

该文采用动态热模拟技术研究了稀土对硬质合金性能与粘结相结为稳定性的影响，发现以非氧化物方式加入稀土元素能改善合金性能，其主要作用是抑制了粘结相向h．c．p结构的马氏体转变，且在长期热循环效应下保持稳定。而以氧化物方式加入稀土元素，抑制粘结相向h.c．p结构的马氏体转变能力差，在一定的热循环效应下不稳定，随着热循环次数的增加，h．c．p结构相含量增加，区改善合金性能不明显。

The effect of adding RE into hard metals has been investigated by means dynamic thermal mechanical physical simulation technology. The results showed that the stability of fcc structure in binder phase has been driproved by adding RE in its metals powder status. After Long time thermal cycling,fcc structure could be Presurred mostly,as a result,the overall mechanical properties of the hard metal could be improved effectively. However, by adding RE in its oxide form,the phase transformation of fcc-hcp in the binder phase could not be restrained and the mechanical properties were deteriorated after long time thermal cycling.