Effect of Ti on microstructure and wear resistance of 304L laser cladding coating for vehicle
In order to improve the wear resistance of 304L stainless steel for vehicles,304L coating and 304L-5％Ti coating were prepared on the surface of 304 stainless steel by laser cladding.The effects of Ti on the phase com-position,morphology,elemental distribution and wear behavior of 304L stainless steel coating were studied.The re-sults show that the phase composition of 304L-5％Ti coating is α-Fe and γ-Fe.A small amount of TiC particles are generated in the coating.The surface microhardness of 304L coating and 304L-5％Ti coating are(187±7.8)HV and(270±8.9)HV,respectively,and the introduction of Ti element increased the microhardness of the coating by 45％.The average friction coefficients of 304L coating and 304L-5％Ti coating are 0.756 and 0.649,respectively,and the specific wear rates are 8.03×10-5 mm3/N·m and 5.41×10-5 mm3/N.m,respectively.The wear rate of 304L-5％Ti coating is reduced by 35％.The wear mechanism of 304L-5％Ti coating is adhesion wear and abrasive wear.
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