激光选区熔化AlSi7Mg合金的微观组织和力学性能  

Microstructure and Mechanical Properties of Selective Laser Melted AlSi7Mg Alloy

作　　者：邹田春[1] 欧尧 祝贺 秦嘉徐 ZOU Tianchun;OU Yao;ZHU He;QIN Jiaxu(Key Laboratory of Civil Aircraft Airworthiness Technology,CAAC,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学,民航民用航空器适航审定技术重点实验室,天津300300

出　　处：《材料导报》2020年第10期10098-10102,共5页Materials Reports

摘　　要：利用激光选区熔化(Selective laser melting,SLM)成形技术对AlSi7Mg合金成形工艺进行研究,并对最佳工艺参数成形沉积态和热处理试样微观组织和力学性能进行分析。结果发现:沉积态试样抗拉强度、屈服强度和延伸率均明显高于铸态性能,横向试样分别达到435.78 MPa、299.23 MPa和14.36%。热处理对SLM试样的微观组织和力学性能影响很大,350℃、3 h退火工艺下,试样延伸率增加到30.83%,抗拉强度和屈服强度分别下降到210.35 MPa和152.01 MPa。本工作表明,可以通过改变工艺参数和热处理控制晶粒尺寸和形状,以获得所需微观组织和力学性能的合金。The process of AlSi7Mg alloy fabricated by selective laser manufacturing(SLM)was studied.The microstructure and mechanical properties of as-built specimens using optimum process parameters and heat-treated specimens were analyzed.The results show that the tensile strength,yield strength and elongation of SLMed AlSi7Mg as-built specimens are much higher than those of casting AlSi7Mg,and horizontal as-built specimens could reach 435.78 MPa,299.23 MPa and 14.36%,respectively.Heat treatment has a great influence on the microstructure and mechanical properties of SLMed specimens.After 350℃/3 h annealing,the elongation of the specimen increases to 30.83%and the tensile strength and yield strength decrease to 210.35 MPa and 152.01 MPa,respectively.It has been found that the size and shape of grains could be controlled in accordance with required microstructure and mechanical properties by changing process parameters and heat treatment conditions.

关 键 词：ALSI7MG 增材制造 激光选区熔化成形 微观组织 力学性能 

分 类 号：TG113.25[金属学及工艺—物理冶金]