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固溶时间对激光选区熔化AlSi10Mg显微组织及显微硬度的影响
沙春生1,刘海英1,王联凤1,赵伟2,孙靖1
1. 上海航天设备制造总厂有限公司,上海 200245;2. 中国卫星海上测控部,江阴 214431
摘要:
采用SEM、EDS、显微硬度等分析方法研究了535℃固溶温度下不同固溶时间对激光选区熔化(Selective laser melting)AlSi10Mg铝合金显微组织及显微硬度的影响。结果表明,在535℃固溶温度下,由纳米尺寸网状Al-Si共晶和过饱和α-Al固溶体组成的激光选区熔化AlSi10Mg显微组织对固溶时间非常敏感,固溶2min后熔池边界及网状共晶组织消失,固溶5min后共晶Si便发生明显球化,共晶Si尺寸随着固溶时间的延长而增大。伴随着显微组织的变化,AlSi10Mg的显微硬度从固溶前的HV(119±3.2)迅速降低,并随着固溶时间的延长最终稳定在HV57左右。
关键词:  AlSi10Mg  激光选区熔化  固溶时间  显微组织  显微硬度
DOI:10.12044/j.issn.1007-2330.2019.02.011
分类号:TB31
基金项目:
Effect of Solid Solution Time on Microstructure and Micro-Hardness of AlSi10Mg Alloy Fabricated by Selective Laser MeltingAlSi10MgAlloyFabricatedbySelectiveLaserMelting
SHA Chunsheng1,LIU Haiying1,WANG Lianfeng1,ZHAO Wei2,SUN Jing1
1. Shanghai Aerospace Equipments Manufacturer Co.ltd, Shanghai 200245;2. Satelite Maritime Tracking and Controlling Department of China, Jiangyin, Jiangsu 214431
Abstract:
The present paper investigated the influence of different solid solution time on the microstructure and micro-hardness of selective laser melting produced AlSi10Mg alloy at 535℃ solid solution temperature by using SEM, EDS and micro-hardness tester. The results showed that the microstructures of AlSi10Mg composed of nano-sized network Al-Si eutectic and the supersaturated α-Al solid solution are very sensitive to solid solution time at 535℃ solid solution temperature.After 2min of solid solution, the boundary of the molten bath and the nano-size network eutectic structure disappeared.After 5min of solid solution, the eutectic Si was obviously spherical, the size of eutectic Si increased with the prolongation of the solid solution time. With the change of microstructure, the micro-hardness of AlSi10Mg is rapidly reduced from (119±3.2)HV0.2for as-built SLM specimens before the solid solution, and with the prolongation of the solid solution time, the micro-hardness eventually stabilizes at about 57HV0.2.
Key words:  AlSi10Mg  Selective laser melting  Solid solution time  Microstructure  Micro-hardness