车用不锈钢表面激光定向能量沉积WC/Co基 复合强化涂层研究

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Abstract： To enhance the wear resistance and service life of automotive 304 stainless steel surfaces，WC/Co-based composite reinforced coatings were fabricated via laser directed energy deposition.The effects of diferent WC particle contents on the microstructure and properties of the coatings were systematically investigated. Through opticalmicroscopyobservation，X-raydiffractionanalysis，hardness testing，andfrictionand wearexperiments，the evolution of the microstructure，phase composition，hardness variations，and wear resistance of the coatings were comprehensively analyzed. The results show that the coatings mainly consist of fcc-Co， Co6W6C Fe6W6C ，and W2C phases.With the increase of WC particlecontent，the proportionofhardphases risesand significant grainrefinement occurs.Both macro- and micro-hardness of the coatings increase markedly with higher WC content，reaching 86.4HRA and 1123.7HV0.5 when the WC content is 40% .Meanwhile，the wear rate of the coatings decreases significantly with the adition of WC particles，and the wear resistance is substantially improved. The enhancement in mechanical properties is atributed to second-phase strengthening，grain refinement strengthening，and dispersion strengthening mechanisms induced by WC particles.This study provides theoretical guidance and technical support for the surface modification and strengthening of automotive stainless steel components.

Keywords： laser directed energy deposition;automotive stainlesssteel; WC/Co composite coating;microstructure： wear resistance

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随着汽车工业的不断发展，车辆对零部件性能的要求日益提高，尤其是在高强度、高耐磨和耐腐蚀性能方面提出了更为严苛的标准。（剩余8641字）