Study on microstructure and performance of laser cladding Ni42Zr30Ta28 amorphous alloy coating

In order to prepare Ni-based amorphous alloy coating on the surface of 45# steel substrate by means of pre-laser cladding method,using the principle of the three clusters and the amorphous line of the law of composition rules,choosing Ni42Zr30Ta28 alloying powder which has a great glass-forming ability in conventional preparation methods of amorphous alloys,the microstructure,mechanical and corrosion performance of the laser cladding coating were analyzed and tested in experiments under the conditions of different laser power.The micro-hardness,wear resistance,salt spray data were obtained.The results showed that:the laser cladding Ni42Zr30Ta28 amorphous composite coating included amorphous and Ni3Zr,Ni5Ta,Ni7Zr2 phase crystallization.Compared with 45# steel,the mechanical and corrosion performance of the amorphous alloy coating were improved greatly.When the laser power was 3300W,the micro-hardness of coating surface reached up to 1496.4HKThe superficial rate of wear was 0.778g·mm-2The corrosion resistance of the coating was improved due to the existence of amorphous.When the laser power was 3000W,the increased unit area weight of the test specimen was 0.0026g·mm-2,and the salt endurance was best.The results provide the theoretical base for large area amorphous composit coating used in high energy lasers.