WC-Co硬质合金的激光热处理

应用ＯＭ，ＳＥＭ和Ｘ射线衍射分析研究了ＷＣ－１８％Ｃｏ硬质合金激光热处理后的组织与硬度性能。指出硬质合金经激光熔融处理后分粘结相β熔化区、ＷＣ溶解析出区和基体三部分。前两区的组织变化导致显微硬度值有相当大的提高，最高可达ＨＶ１５４４，比原来提高３４～３７％。Ｘ射线衍射分析表明，面心立方Ｃｏ的含量在激光处理后将发生改变，并会出现密排六方Ｃｏ，其相应数量与激光工艺参数有关。

Laser Heat Treatment of WC Co Hardmetal

Using OM, SEM and X ray diffraction analyses, the investigation into microstructure and hardness profiles of a WC 18% Co hardmetal after laser processing has been conducted. The microstructure can be divided into Co phase, β, remelted zone, WC grains resolved precipitated zone and substrate. By virtue of these changes the highest hardness is 1544 Hv and the increment can be 34～37% compared with the original hardness of the material. From the X-ray diffraction results it follows that the content of face centered cubic cobalt will be varied and the hexagonal close packed cobalt may occur or increase, but their constituent proportions are connected with the laser processing parameters.