Wear performance of Fe-based alloy strengthened by laser cladding under high temperature

In order to increase the wear life of 40Cr steel, preset laser cladding techniques were adopted with Fe-based alloy powders which were obtained on the 40Cr steel substrate. Wear tests were carried out with HT-500 wear tester to determine the rule of friction coefficient varying with temperature under dry friction condition. Moreover, the depth and width of wear scars were measured by surface roughness profiler. The micrographs of wear scar on cladding coating were scanned by SEM. The microhardness of both cladding coating and substrate were measured by HV-1000 microhardness instrument. As the tests show, under dry sliding condition, with the increase of temperature and wear time, the wear course became stable. The average friction coefficient reduced,the wear rate rose, the wear resistance