Effect of Laser Cladding Lap Ratio of 304 Stainless Steel on Microstructure, Wear Resistance and Corrosion Resistance of CoCrW Coating
FANG Zhenxing1, QI Wenjun1, LI Zhiqin2
1 School of Mechanical Engineering, Xinjiang University, Urumqi 830047, China 2 Xinjiang Uygur Autonomous Region Office of Defense Science, Technology and Industry, Urumqi 830000, China
Abstract: The CoCrW alloy coating was prepared on the surface of 304 stainless steel by fiber laser to improve the wear resistance and corrosion resistance of the surface of 304 stainless steel. The effects of different lap ratio on the structure, hardness, wear resistance and corrosion resistance of the coating were analyzed by OM, SEM, XRD, EDS, microhardness tester, MMG-500 wear tester and CS310 electrochemical workstation. The better lapping rate was found and obtain the best performance coating. Results of research indicated that:there were no obvious defects in the coating with 30% lap ratio. The top and bottom of the coating were cellular crystal, columnar crystal and plane crystal, respecticely. These crystals are mainly composed of the crystal nucleus formed by the γ-Co phase of fcc structure and the grain boundary formed by some Cr7C3, (Co, Cr)23C6 phases. The optimum lap ratio is 30%. Under this parameter, the microhardness of the coating reaches 450HV, about 2.1 times of the microhardness of the substrate (210HV); the wear amount of the coating is 12.71 mg, about 20% of the substrate (63.06 mg);the average friction coefficient of the coating is about 0.4, about 60% of the substrate (0.65); the self corrosion potential of the coating is -889 mV, the self corrosion potential of the substrate is -998 mV; the self corrosion current density of the coating is 5.7 μA/cm2, about 14% of the substrate (38.9 μA/cm2). The corrosion tendency of 304 stainless steel coating is smaller and the microhardness, wear resistance and corrosion resistance are significantly improved by suitable coating materials and laser cladding process parameters.
方振兴, 祁文军, 李志勤. 304不锈钢激光熔覆搭接率对CoCrW涂层组织与耐磨及耐腐蚀性能的影响[J]. 材料导报, 2021, 35(12): 12123-12129.
FANG Zhenxing, QI Wenjun, LI Zhiqin. Effect of Laser Cladding Lap Ratio of 304 Stainless Steel on Microstructure, Wear Resistance and Corrosion Resistance of CoCrW Coating. Materials Reports, 2021, 35(12): 12123-12129.
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2021, Vol. 35 
