W_9Mo_3Cr_4V钢脉冲放电强化涂层激光熔覆的研究

Laser Cladding Study of a Pulse Discharge Enhanced Layer for W 9Mo 3Cr 4V Steel

采用ＸＲＤ和ＴＥＭ等现代分析手段研究了Ｗ９Ｍｏ３Ｃｒ４Ｖ高速钢脉冲放电ＹＧ８强化涂层激光熔覆后的组织与表面硬度变化。结果表明，经适当的激光熔覆后，试样表面硬度可达ＨＶ０．１１６００～１８００。分析认为，获得如此高硬度的主要原因是Ｗ２Ｃ和ＷＣ等高硬相及纳米晶组织的形成。

After laser cladding, the microstructure and surface hardness of a YG8 pulse discharge coating for W 9Mo 3Cr 4V high speed steel were studied by means of XRD and TEM, etc. The results showed that the surface hardness of the coating could come up to HV 0.1 1600￣1800 after it was laser cladded. It is thought that formation of higher hard phases, such as W 2C, and nanometer crystal microstructure is mainly responsible for so high coating hardness.