稀土对铁基合金激光熔覆层耐磨及耐蚀性能的影响.doc

匡建新,汪新衡(湖南工学院,湖南衡阳,421002)摘要:在45钢基材上激光熔敷添加CeO2的Fe基合金粉末,得到了与基材结合良好的合金熔覆层,对熔覆层进行了显微组织观察,显微硬度测量,摩擦磨损性能及耐腐蚀性能测试。结果表明,引入稀土有利于促进晶粒细化,提高熔覆层的组织均匀性及表面硬度,改善熔覆层的摩擦磨损性能和耐腐蚀性能。关键词:激光熔覆;铁基合金;显微硬度;摩擦磨损性能;耐腐蚀性能EffectofLa2O3onWearResistanceofLaser-CladdedFe-BasedAlloyCoatingsZHAOGao-min,WANGKun-lin,LIChuan-gang(DepartmentofMechanicalEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:Laser-claddedFe-basedalloycoatingsofdifferentLa2O3contentswerepreparedon16Mnsteelsur-,microstructures,andtribo-logicalbehaviorsoftheresultinglaser--claddedcoatingswasmeasured,themicrostructuresandwornsurfacesmorphologiesofthecoatingswereexaminedonascanningelectronmicroscope,andthefrictionandwearbehaviorsofthecoatingsslidingagainstAISI-1045steelinaring-on-blockconfigurationwereevaluatedonanMM--hemicrostructuresofthecoatings,whichledtoincreasewear-,theinclusionoftherareearthoxidecausedchangesinthewearmechanismsofthelaser-claddedcoatingsaswell,whichcorrespondedtothedifferencesinthewear-%prehensivetribologicalpropertiesofthelaser-claddedFe-:laserclad