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采用Gleeble 1500对WC-12Co硬质合金进行不同温度和应力场的压缩疲劳实验,测量疲劳前后合金硬度的变化,通过扫描电镜(SEM)、透射电镜(TEM)等手段观察其组织结构的变化并分析其变形失效机理.结果表明:随着实验温度与加载载荷的升高,WC-12Co合金硬度呈下降趋势,WC晶粒发生圆化,WC晶粒骨架的完整程度下降.WC-12Co合金的疲劳变形失效机理为:在较低变形温度和变形载荷下,塑性变形由WC相中的位错滑移和黏结相马氏体转变所提供,随着变形温度和变形载荷的升高,塑性变形则通过硬质相的层错运动和WC/WC的界面滑动形成黏结相条带来实现.
The compressive fatigue experiment of WC-12Co cemented carbide with different temperature and stress field was carried out by Gleeble 1500. The changes of the alloy hardness before and after fatigue were measured. The changes of microstructure were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) The results show that the hardness of WC-12Co alloy decreases with the increase of temperature and load, and the grain size of WC decreases and the completeness of WC crystal skeleton decreases.WC-12Co alloy The failure mechanism of fatigue failure is as follows: plastic deformation is provided by dislocation slip in WC phase and martensite transformation at lower deformation temperature and deformation load. With the increase of deformation temperature and deformation load, plastic deformation Then through the hard phase of the fault movement and WC / WC interface sliding form bonding phase strip to achieve.