Characteristics and removal mechanism in laser cutting of cBN-WC-10Co composites
Characteristics and removal mechanism in laser cutting of cBN-WC-10Co composites
复制标题
cBN-WC-10Co复合材料激光切割特性及去除机理
DOI：
10.1016/j.jmatprotec.2015.11.014
复制
发表时间：
2016-04
影响因子：
6.3
通讯作者：
Yueqin WU
中科院分区：
文献类型：
--
作者：
毛聪;孙小丽;Han HUANG;Chengwei KANG;张明军;Yueqin WU
使用脉冲 Nd:YAG 激光器对 cBN-WC-10Co 复合材料进行激光切割。研究了切削特性以及显微组织和机械性能的变化。结果发现，激光加工在亚表面引起裂纹，并且在切割表面观察到从cBN到hBN的相变证据。切削参数对切削面有显着影响。与使用较低的激光功率相比，较高的激光功率产生更平滑的切割表面，但热影响区更大。在激光功率为 100 W 时，横截面未发现自由基裂纹。表面粗糙度和热影响区深度随着切割速度和气体压力的增加而减小。 cBN-WC-Co 复合材料激光切割中涉及的材料去除归因于 cBN 和 WC-Co 的熔化或蒸发。在激光功率为 30 W 的切割过程中，还发现由于 WC-Co 基体失去支撑，cBN 颗粒从切割表面掉落。
Laser cutting of a cBN–WC–10Co composite material was carried out using a pulsed Nd: YAG laser. The cutting characteristics, as well as the changes in microstructure and mechanical property, were investigated. It was found that cracks were induced by laser machining on the sub-surface and the evidence of phase transformation from cBN to hBN was observed on the cut surface. Cutting parameters had significant effect on the cut surface. A higher laser power produced a smoother cut surface, but a larger heat-affected zone, in comparison to the lower laser power used. No radical cracks were found on the cross-section at the laser power of 100 W. The surface roughness and the heat-affected zone depth decreased with the increased cutting speed and the gas pressure. The material removal involved in the laser cutting of cBN–WC–Co composite was attributed to the melting or evaporation of cBN and WC–Co. The dropping of cBN particles from the cut surface was also found during the cutting at the laser power of 30 W for the loss of the supporting from the WC–Co matrix.
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