Ti对车用304L不锈钢熔覆层组织及耐磨性的影响

Effect of Ti on microstructure and wear resistance of 304L laser cladding coating forvehicle

为提升车用304L不锈钢的耐磨性,采用激光熔覆技术在304不锈钢表面制备304L涂层和304L-5%Ti涂层。研究了Ti元素对304L不锈钢涂层相组成、形貌、元素分布及磨损行为的影响。结果表明:304L-5%Ti涂层的相组成为α-Fe及γ-Fe。并在涂层中生成了少量TiC颗粒。304L涂层和304L-5%Ti涂层的表面显微硬度分别为(187±7.8)HV和(270±8.9)HV,Ti元素的引入使涂层的显微硬度提升45%。304L涂层和304L-5%Ti涂层的平均摩擦因数分别为0.756和0.649,比磨损率分别为8.03×10^(-5)mm^(3)/N·m和5.41×10^(-5)mm^(3)/N·m,304L-5%Ti涂层的磨损率降低了35%。304L-5%Ti涂层的磨损机制为粘着磨损和磨粒磨损。

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 isα-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)mm^(3)/Nm and 5.41×10^(-5)mm^(3)/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.