SLM成形Al-Mg-Li-Cu合金残余应力及组织性能  

Residual Stress,Microstructure and Properties of SLM-formed Al-Mg-Li-Cu Alloy

作　　者：孙金娥 贺亚飞 Sun Jin'e;He Yafei(School of Materials Science and Engineering,Tianjin College,University of Science and Technology Beijing;Institute for Advanced Materials and Technology,University of Science and Technology Beijing;Depertment of Foundation Courses,Tianjing College,University of Science and Technology Beijing)

机构地区：[1]北京科技大学天津学院材料科学与工程学院 [2]北京科技大学新材料技术研究院 [3]北京科技大学天津学院基础部

出　　处：《特种铸造及有色合金》2023年第3期313-317,共5页Special Casting & Nonferrous Alloys

基　　金：天津市教育科研计划资助项目(2021KJ605)。

摘　　要：通过阿基米德排水法以及试验测试综合分析选区激光熔融成形Al-Mg-Li-Cu合金的致密度、微观形貌和硬度等组织性能特征,探究了打印参数对合金残余应力的影响。结果表明,当粉末层厚(T)、激光功率(P)、舱口间距(H)逐渐增加时,残余应力逐渐减小。当T、P、H一定时,残余应力随扫描速率的增加先减小后增大。在最佳打印参数如下:P为240 W、V为140 mm/s、H为100μm、T为50μm时,成形件的残余应力最小,为56.53 MPa,且致密度高,硬度(HV)为114。The density,micromorphology and hardness of SLM-formed Al-Mg-Li-Cu alloy were comprehensively investigated by Archimedes drainage method and tests.The influence of printing parameters on the residual stress of alloy was explored.The results indicate that the residual stress of Al-Mg-Li-Cu alloy is gradually reduced with the increase of powder layer thickness(T),laser power(P)and hatch spacing(H).When T、P、H are constant,the residual stress is decreased firstly and then increased as the scanning rate increases.The optimal printing parameters is presented as follows:laser power of 240 W,scanning rate of 140 mm/s,scanning spacing of 100μm,and layer thickness of 50μm,corresponding to the minimum residual stress of 56.53 MPa,where the alloy is highly dense,and the hardness is 114 HV.

关 键 词：选区激光熔融 Al-Mg-Li-Cu合金 残余应力 致密度 硬度 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG249.9[金属学及工艺—金属材料]