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요약정보
激光选区熔化AlSi10Mg工艺优化及显微组织研究
Resource Type
Academic Journal
Authors
孙兵兵
;
房立家
;
张学军
Source
焊接技术 / Welding Technology
. 49(2):5-8
Subject
激光选区熔化
显微组织
AlSi10Mg
致密度
激光成形
Language
Chinese
ISSN
1002-025X
Online Access
Find it @ DONGA
초록
利用激光选区熔化成形技术(selective laser melting,SLM)对AlSi10Mg的成形进行了工艺研究,对不同激光工艺参数的材料致密化行为及显微组织特征进行了研究,分析了熔池底部气孔形成机理,对成形态和热处理态试样进行力学性能测试.结果 表明:激光能量密度过高或过低均不能得到最佳致密度,当激光功率350W,激光扫描速度1 800 mm/s时,致密度达99.9%.选用最佳工艺参数下成形态试样的抗拉强度达473 MPa,屈服强度达289 MPa,远优于铸件标准.在270℃保温2h退火制度下,过饱和固溶在α-Al中的Si元素析出,固溶强化的作用减弱,晶粒粗化,抗拉强度及屈服强度均下降.伸长率和断面收缩率分别提高了14.5%和50.7%.
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