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

doi:10.11896/cldb.20040103

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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.

Key words： laser cladding 304 stainless steel multi pass lapping microstructure coating performance

Published: 01 July 2021

CLC number:

TG174

Fund:Autonomous Region University Scientific Research Program Key Natural Science Projects(XJEDU20201007)and National College Student Innovation Training Program Project(201910755067).

About author:: Zhenxing Fang,postgraduate of Xinjiang University.He has been studying at Xinjiang University since September 2018 and is mainly engaged in research in the field of laser cladding.
Wenjun Qi, professor and master's tutor of Xinjiang University,graduated from Southwest Jiaotong University in 1993 and has served in Xinjiang University.She presided over national projects, key projects of the Ministry of Education, and national key laboratory projects, and participated in the “973” sub-projects, the National Natural Science Foundation of China, provincial and ministerial projects, etc.She has published more than 70 journal paper, including more than 10 articles included in EI, and two teaching materials designated by the Ministry of education, i.e. Design and Application of Mechatronics System. As the main participant, she won the second prize of scientific and technological progress and the second prize of teaching achievement in the autonomous region. Research focus:digital design and application in the field of material processing.

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Cite this article:

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[J]. Materials Reports, 2021, 35(12): 12123-12129.

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http://www.mater-rep.com/EN/10.11896/cldb.20040103 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12123

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