球磨时间对YT14硬质合金性能的影响

采用真空烧结方法制备了YT14硬质合金。研究了不同的球磨时间对YT14硬质合金粉体粒度、烧结体密度、抗弯强度和硬度的影响。结果表明：随着球磨时间从24h延长至120h，合金粉体的粒度表现出先减小后增大的势态，合金烧结体的抗弯强度和硬度呈现出先增大后减小的势态，合金烧结体的密度几乎保持不变；当球磨时间取72h时，YT14硬质合金获得了最优异的综合性能。

微量稀土元素添加剂对YT14硬质合金粒度的影响

利用能谱仪的图像处理程序研究了微量混合稀土元素添加剂对ＹＴ１４硬质合会粒度的影响。结果表明：添加剂不影响硬质相ＷＣ和粘结相Ｃｏ的粒度，但可以抑制ＹＴ类硬质合金中（Ｗ，Ｔｉ）Ｃ固溶体晶粒长大，细化晶粒，使晶粒大小均匀。

Effect of Adding Rare Earth Element on Cemented Carbide YT14 by Digital Image

The properties of the cemented carbides with RE-addition were improved in our research.there is a 10% increase of the transverse rupture strength(T.R.S) of YT14RE as compared with that of YT14.The hardness and the density of YT14RE are higher than that of YT14.The cast steel was cut at a speed of 140 m/min by cutting tcols which made from YT14RE and YT14.The wear resistant of the former is 1.5 time of the latter.The samples of YT14RE and YT14 were ground and polished(the content of the RE elements is less than 0.10 wt%).This paper studied the effect of adding rare earth element on cemented carbide by digital image.