钛合金稀释作用对NiCrBSiC激光熔覆层微观结构的影响  

Influence of Ti Substrate Dilution on the Microstructure of NiCrBSiC Laser Clad Coatings

作　　者：孙荣禄[1,2] 刘智勇[3] 牛伟[1] 雷贻文[1] 

机构地区：[1]天津工业大学机械电子学院,天津300160 [2]天津市现代机电装备技术重点实验室,天津300160 [3]天津钢管集团股份有限公司,天津300301

出　　处：《中国激光》2008年第11期1741-1745,共5页Chinese Journal of Lasers

基　　金：中国博士后科学基金(20060400700);天津市高等学校科技发展基金(20060912)资助课题

摘　　要：采用横流CO2激光器在TC4合金表面熔覆NiCrBSiC合金涂层,探讨了激光熔覆工艺参数对涂层稀释率和微观结构的影响。结果表明,在激光功率密度和辐照时间相同的条件下,大直径(D=6 mm)光斑热源能获得更深的基体熔化深度,涂层的稀释率较高,涂层中的强化相主要为TiB2和TiC相;小直径(D=3 mm)光斑热源基体熔化深度较浅,涂层的稀释率较低,涂层中的强化相为CrB以及少量的M23(CB)6和TiC相。NiCrBSiC laser clad coatings are fabricated on TC4 substrate using CW-CO2 laser. The influence of processing parameter on the microstructure and dilution rate of the coatings is examined. Under the same power density and irradiation time, the depth of substrate fusion is deeper, the dilution rate of the coatings is higher and the reinforcing phases are mainly TiB2 and TiC when the laser beam diameter is lager （D = 6 mm）. The depth of substrate fusion is shallower, the dilution rate of the coatings is lower and the reinforcing phases are mainly CrB and small amount of M23 （CB）6 and TiC when the laser beam diameter is smaller （D=3 mm）.

关 键 词：激光技术 激光熔覆 钛合金 NiCrBSiC合金 微观结构 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]