摘要
采用激光熔化沉积技术对2195铝锂合金进行制备,通过单道以及搭接试验分析激光熔化沉积2195铝锂合金的最佳工艺参数,并利用光学显微镜(OM)等表征方法对其微观组织进行系统研究。结果表明,最佳沉积工艺参数为扫描功率1400 W,扫描速度480 mm/min,扫描间距1.6 mm。利用最佳工艺参数进行5层堆叠块体打印所得激光熔化沉积2195铝锂合金的微观组织中会出现沿晶界分布的析出相TB(Al7Cu4Li)相;激光熔化沉积2195铝锂合金经450℃固溶2 h后,合金中的第二相发生回溶;155℃时效32 h水冷后,合金中的不稳定过饱和固溶体Al7Cu4Li相会析出稳定的第二相,形成稳定时效态组织,硬度比固溶处理试样明显增加。
2195 aluminum-lithium alloy was prepared by laser melting deposition(LMD)technology.The optimal process parameters of laser melting deposited 2195 Al-Li alloy were analyzed by single-channel and overlap-track experiments,and the microstructure of the alloy was systematically studied by optical microscope(OM)and other characterization methods.The results show that the optimum deposition process parameters are scanning power of 1400 W,scanning rate of 480 mm/min and scanning spacing of 1.6 mm,and precipitated Al7Cu4Li(TB)phase is found to distribute along grain boundary in the alloy 5-layer stacked blocks printed by the optimal process parameters,and then the precipitated phase gradually dissolves into the matrix after solution treatment at 450℃for 2 h.After aging at 155℃for 32 h and water cooling,stable second phase precipitates from unstable supraturated solid solution Al7Cu4Li and forming stable aging structure,so that the hardness of the aged specimen is significantly higher than that of the specimen solution treated.
作者
顾海
张捷
孙健华
吴国庆
孙中刚
Gu Hai;Zhang Jie;Sun Jianhua;Wu Guoqing;Sun Zhonggang(College of Mechanical Engineering,Nantong Institute of Technology,Nantong Jiangsu 226002,China;Jiangsu Key Laboratory of 3D Printing Equipment and Application Technology,Nantong Institute of Technology,Nantong Jiangsu 226002,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第1期52-59,共8页
Heat Treatment of Metals
基金
南通理工学院拔尖人才项目(XBJRC2021003)
南通理工学院省级科技服务平台培育项目(XQPT202101)
江苏省科技计划(BE2018010-4)
南通市科技计划(JC2020155,JCZ19122,JC2020132)
江苏省产学研合作项目(BY2020545)。
关键词
增材制造
铝锂合金
激光熔化沉积
工艺参数
显微组织
additive manufacturing
aluminum-lithium alloy
laser melting deposition
process parameter
microstructure
作者简介
顾海(1982—),男,副教授,博士,主要研究方向为金属增材制造,E-mail:guhaint@ntit.edu.cn;通讯作者:孙中刚,副教授,博士,E-mail:sunzgg@163.com。
