工艺参数对铝青铜表面激光熔覆镍基合金温度场的影响  

Effects of Process Parameters on Temperature Field of Laser Cladding Ni-Base Alloy on Aluminum Bronze

作　　者：徐建林[1,2] 于涛[3,4] 杨波[1,2] 龙大伟[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,石家庄050035 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050石家庄050035 [3]兰州理工大学 [4]石家庄强大泵业集团有限责任公司研发中心金属材料实验室,石家庄050035

出　　处：《机械工程材料》2011年第1期93-96,99,共5页Materials For Mechanical Engineering

基　　金：甘肃省自然科学基金资助项目(0809RJZA003);兰州理工大学博士基金资助项目(SB01200608)

摘　　要：以铝青铜为基体材料、铜镍合金粉为涂层材料,采用数值模拟方法模拟了激光熔覆过程中温度场的分布,探讨了工艺参数对温度场的影响,进而优化了工艺参数并进行了试验验证。结果表明:当激光扫描速度不变时,激光功率与熔覆层峰值温度呈正比关系,对分布场分布影响不大;激光功率相同时,预热温度和光斑直径、扫描速度分别与峰值温度呈正比和反比关系;在激光熔覆试验中,当预热温度为200℃、激光功率从3800W逐渐降低到2000W、光斑直径为4mm、激光扫描速度为6～8mm.s-1时,可获得良好的熔覆效果。Using aluminum bronze as the base material,copper-nickel alloy powders as the coating material,the distribution of temperature field was simulated in the process of laser cladding by numerical simulation technology.The effects of process parameters on the temperature field were investigated.The process parameters were optimized and then validated.The results show that the peak temperature of the cladding layer was in proportion to the elevation of laser power when the scanning speed was constant.When the laser power was the same,the peak temperature was in proportion the preheating temperature and the spot diameter,while in inverse proportion to the scanning speed.A good laser cladding could be obtained when the preheating temperature was 200 ℃,the laser power was gradually decreased from 3 800 W to 2 000 W in the laser cladding process,the diameter of laser spot was 4 mm and laser scanning speed was 6-8 mm·s-1.

关 键 词：工艺参数 激光熔覆 铜镍合金 数值模拟 温度场 

分 类 号：TG166.2[金属学及工艺—热处理]