Study on Surface Hardness of Laser Gas Nitrided TA2 Alloy

Laser surface gas nitriding is an attractive method to enhance surface hardness and wear resistance of titanium alloy.The effects of laser gas nitriding parameters and laser beam distributing on the surface hardness of laser nitrided layer were studied through analysing the microstructure and the testing data of the hardness.The results show that the main reason of the increased surface hardness of TA2 titanium alloy is the generation of TiN in nitriding area,and the gas nitriding process that facilitates the generation of TiN can increase the surface hardness of TA2 titanium alloy.The application of strip integral mirror can change the laser beam,thus the efficiency of laser gas nitriding has been enhanced,and the average surface hardness is 1.3 times of the original.