激光气体氮化TA2钛合金时,氮化区表面形态和硬度受激光加工参量影响很大。在不同的激光氮化参量作用下,氮化区内熔体的对流形式和程度不同,使TA2钛合金表面形态呈现不同的特征。激光氮化后,TA2钛合金表面硬度提高。氮化区域内生成硬质相TiN是TA2钛合金表面硬度得到提高的主要原因。 When the laser gas is nitrided TA2 titanium alloy, the surface morphology and hardness of the nitrided zone are greatly influenced by the laser processing parameters. Under different parameters of laser nitriding, the convection forms and degrees of melt in the nitriding zone are different, which makes the surface morphology of TA2 titanium alloy present different characteristics. After laser nitriding, TA2 titanium alloy surface hardness increased. The formation of hard phase TiN in the nitrided region is the main reason for the increase of surface hardness of TA2 titanium alloy.