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作 者:张秋华[1] Zhang Qiuhua(Wuhu Institute of Technology,Wuhu 241000,Anhui,China)
出 处:《应用激光》2024年第6期46-52,共7页Applied Laser
基 金:国家双高校科研平台建设子项目及升级培育项目(KJCXPT202005);安徽省高校优秀拔尖人才培育项目(GXGNFX2018097);校级开放型区域产教融合实践中心(2023SJZX02)。
摘 要:采用激光熔覆技术在汽车焊接件表面制备CoFeCrNiV熔覆层,分别对熔覆层的相组成、金相微观组织及熔覆层截面的晶体学特征进行分析,并对熔覆层的硬度及耐磨性进行研究,具体结论如下:CoFeCrNiV熔覆层的相组成为单一的FCC固溶体相,由于V元素溶解在FCC相中导致FCC相产生晶格畸变,从而促进FCC相的固溶强化效应。CoFeCrNiV熔覆层的平均显微硬度为约为466.7 HV±6.9 HV,约为201基体的1.9倍。固溶强化和位错强化是CoFeCrNiV熔覆层具有较高硬度的主要原因。CoFeCrNiV熔覆层的平均摩擦系数为0.55。CoFeCrNiV熔覆层的磨损率为1.91×10-5mm3/(N·m),约为基体的0.32倍。CoFeCrNiV熔覆层的磨损机理为黏着磨损和磨粒磨损。采用激光熔覆技术在汽车焊接部件用201不锈钢表面制备CoFeCrNiV熔覆层可显著提升其硬度及耐磨性。CoFeCrNiV cladding layer was prepared on the surface of automobile welding parts by laser cladding technology.The phase composition,metallographic microstructure and crystallographic characteristics of cladding layer were analyzed respectively,and the hardness and wear resistance of cladding layer were studied.Specific conclusions are as follows:The phase composition of the CoFeCrNiV cladding layer is a single FCC solid solution phase.The lattice distortion of the FCC phase is caused by the V element dissolving in the FCC phase,which promotes the solid solution strengthening effect of the FCC phase.The average microhardness of CoFeCrNiV is 466.7±6.9 HV,1.9 times higher than that of the 201 matrix,with solution strengthening and dislocation strengthening identified as the primary contributors to its elevated hardness.The average friction coefficient of CoFeCrNiV cladding layer is 0.55.The specific wear rate of CoFeCrNiV cladding layer is 1.91×10~(-5)mm~3/(N·m),approximately 0.32 times that of the substrate,indicating its superior wear resistance.The predominant wear mechanisms for the CoFeCrNiV cladding layer are adhesive and abrasive wear.The study demonstrates that the hardness and wear resistance of CoFeCrNiV coating on 201 stainless steel surface of automobile welded parts can be significantly improved by laser cladding technology.
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