Effect of feed distance on microstructure and properties of laser-electric composite cladding layer
In this paper,the repair process of mechanical parts is studied by the method of"laser-electric composite wire cladding".Multi-pass single layer cladding experiments are conducted on 45# steel surface using 630 stainless steel wire to investigate the effects of different feed distances on the macroscopic morphology,microstructure,micro-hardness and wear resistance of the clad layer.The results show that with the increase of feeding distance,the bonding surface of the clad layer and the substrate became uneven,the surface of the clad layer has small particles of impuri-ties,the thickness of the clad layer decreases,the microstructure is chaotic isometric crystal,the average hardness of the clad layer fluctuated above and below 200 HV.Moreover,the coefficient of friction shows a tendency of decreasing and then increasing,and there is a positive correlation between the amount of wear and the coefficient of friction.The wear patterns of the wear marks are observed and the wear forms are mainly fatigue wear and adhesive wear and the best wear resistance is achieved when the feed distance is 1.2 mm under the current experimental conditions.
laser-electric recombinationwirefriction and wearstainless steelmicrostructure
万方数据
维普
