In order to improve the abrasion resistance and corrosion resistance of multi-stage step-down control valve spool,and shorten the manufacturing cycle of such parts,Stellite12 alloy was prepared on the surface of valve spool by laser cladding and gas tungsten arc welding(GTAW).The microstructure,microhardness,friction and wear properties,uniform corrosion properties of the surfacing welded Stellite 12 alloy layer were compared and studied.The results show that the surfacing welded alloy layer prepared by both methods forms a good metallurgical bond with the substrate,and the microstructure is mainly composed of dendrite structures of plane crystal,coarse columnar dendrites,fine and dense equiaxed dendrites.Compared with that of GTAW,the laser clad alloy layer has more dense and fine dendrite structure,and more uniform distribution of dendrite composition.At the same time,the laser clad alloy layer has higher microhardness and better abrasion resistance.In addition,the laser clad alloy layer has lower uniform corrosion rate and more uniform corrosion behavior than the GTAW alloy layer.
control valve spoollaser claddingGTAWStellite12 alloymicrostructureproperties
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