Microstructure and abrasion wear behavior of Ni-based laser cladding alloy layer at high temperature

Abstract

Ni-based alloy coating on 21-4-N heat-resistant steel was prepared using CO₂ laser, and the high-temperature abrasion wear was tested. The microstructure of this cladding layer and its abrasion wear behavior at high temperature by changing compositions and temperatures were investigated by means of optical microscope and scanning electron microscope. Among the three compositions of cladding layer, i. e. Ni21+20%WC+0.5%CeO₂, Ni25+20%WC+0.5%CeO₂ and Ni60+20%WC+0.5%CeO₂, the experimental results show that Ni21+20%WC+0.5%CeO₂ cladding layer is made up of finer grains, and presents the best abrasion wear behavior at high temperature. The wear pattern of laser cladding layer is mainly grain abrasion at lower temperature, and it would be changed to adhesive abrasion and oxide abrasion at higher temperature.

Keywords

Ni-based laser cladding layer / microstructure / abrasion wear behavior / high temperature