The influence of laser cladding process parameters on the forming quality of single pass coatings on iron-based alloys
In order to explore the influence of laser cladding process parameters on the forming quality of the single pass coating of iron based alloy,the laser cladding Fe45 alloy coating on the surface of 42CrMo steel was used to ob-tain the optimal cladding process parameters by orthogonal experiment,and the main and secondary influences of the process parameters on the geometry,dilution rate and microhardness of the single pass coating were analyzed.The influence of process parameters on melting width,dilution rate and microhardness was investigated by using the sin-gle factor controlled variable method.The results show that the optimal cladding parameters are 1 500 W laser pow-er,15 mm/s scanning speed and 14 g/min powder feeding rate.The influence of laser power on melting depth,melt-ing width,dilution rate and microhardness is the most significant,and the influence of scanning speed on melting height is the most significant.When the laser power increases from 1 200 W to 2 100 W,the melting width increases from 1.78 mm to 2.73 mm,and the dilution rate increases from 21％to 67％.When the scanning speed increases from 6mm/s to 15 mm/s,the melting width decreases from 2.70 mm to 2.19 mm,and the dilution rate decreases from 42％to 29％.The powder feeding rate has little influence on the melting width,and the melting width is kept at about 2.15 mm.When the powder feeding rate is 12～14 g/min,the dilution rate decreases obviously,and then it is basically unchanged.The microhardness of the Fe45 alloy coating prepared by the experiment is 2.3 times than that of the substrate,which can significantly improve the surface wear resistance of shaft parts and prolong their service life.This study can provide theoretical guidance for the preparation of Fe-base alloy coatings with good form-ing quality.
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