车用Al-Si合金激光熔覆涂层的组织与性能研究.pdfVIP

HotWorkingTechnology2020,Vol.49,No.12

车用Al-Si合金激光溶覆涂层的组织与性能研究

吴孝泉u，胡伟1

(1.江西科技学院汽车工程学院，江西南昌330098;2.南昌大学机电工程学院，江西南昌330031)

摘要：为增强铝合金表面性能，在铝合金表面上激光熔覆Al/Ti/C合金粉末，得到原位TiC增强熔覆层。结果表

明：熔覆层的结合界面为锯齿状，且熔覆层的致密度好、无裂纹；在熔覆层生成了A13Ti和TiC增强相;在熔覆层和基体

的结合面处，Al3Ti和TiC尺寸分别为2〜4pm和1jxm,熔覆层中部Al3Ti和TiC分别为6〜10球状晶粒和3〜5

pm的十字晶枝;熔覆层的平均稀释率低于3.5%。

关键词：铝合金；激光熔覆；原位;TiC增强颗粒

DOI:10.14158/j.enki.1001-3814

中图分类号：TG124文献标识码:A文章编号：1001-3814(2020)12-0090-05

StudyonMicrostructureandPropertiesofAl-SiAlloyLaserCladdingLayer

forAutomotive

WUXiaoquan1*2,HUWei1

(1.SchoolofAutomotiveEngineeringJiangxiUniversityofTechnology,Nanchang330098,China;2.SchoolofMechanical

andElectricalEngineering,NanchangUniversity,Nanchang330031,China)

AbstractInordertoreinforcethesurfacepropertieso：fA1alloy,Al/Ti/Cmixedpowderwaslasercladdedonthesurface

ofaluminumalloy,andthen,ain-situTiCreinforcedcladdinglayerwasobtained.Theresultsshowthatthebondinginterface

ofthecladdinglayeriszigzag.Thedensityofthecladdinglayerisgood,andthecladdinglayerhasnocrack.Al3TiandTiC

reinforcedphaseappearsincladdinglayer.Atthejunctionofcladdinglayerandsubstate,thesizeofAl3TiandTiCis2-4fim

and1^m,thesizeofcentralAl3TiandTiCincladdinglayerof6-10jjimsphericalgrainand3-5(xmcrossdendrites,

respectively.Theaveragedilutionofthecladdinglayerisabout3.5%.