热处理对激光选区熔化高强铝合金组织及性能影响  

Influence of Heat Treatment on Microstructure and Performance of Laser Selective Melting High Strength Aluminum Alloy

作　　者：李达 吕非 周凯 刘瑞康 田宗军[1] LI Da;LYU Fei;OU Kai;LIU Ruikang;TIAN Zongjun(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Laser Equipment and Machining Technology R&D Center,Nanjing Institute of Advanced Laser Technology,Nanjing 210038,China;Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]南京先进激光技术研究院激光装备及工艺技术研发中心,江苏南京210038 [3]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800

出　　处：《热加工工艺》2024年第6期35-40,47,共7页Hot Working Technology

基　　金：江苏省重点研发项目(BE2019002);南京市新型研发机构联合技术攻关项目(202208018)。

摘　　要：为了充分发挥高强铝合金材料的性能潜力,从热处理强化角度出发,选择了4种不同的热处理制度,并从物相、组织、性能对热处理后的铝合金SLM成形样件展开研究,最终筛选出最适合的热处理制度。结果表明,300℃/6 h/炉冷的强化时效(EA)热处理后的样件具有最高的抗拉强度575 MPa,较未经热处理的原SLM成形件的抗拉强度提高25%,伸长率有一定程度的下降但仍满足正常需求。强化机制主要为:过饱和Mn元素固溶体带来的固溶强化、细密且具有一定热稳定性微观组织形貌带来的细晶强化以及热处理后生成的纳米级Al3Sc相沉淀粒子带来的第二相强化。In order to fully exert the potential of high-strength aluminum alloy materials,four different heat treatment systems were selected from the perspective of thermal strengthening,and the heat-treated aluminum alloy SLM forming samples were studied from the aspects of phase,microstructure,and performance.Finally,the most suitable heat treatment process was screened out.The results show that,the sample with the enhanced aging(EA)heat treatment of 300℃/6 h/furnace cooling has the highest tensile strength of 575 MPa,which is 25%higher than that of the original SLM forming sample without heat treatment.The elongation decreases to some extent,but still meets normal requirements.The strengthening mechanisms are mainly the following three:solid solution strengthening brought by supersaturated Mn element solid solution,fine and thermally stable microstructure morphology leading to fine grain strengthening,and second-phase strengthening brought by nano-scale Al3Sc phase precipitates generated after heat treatment.

关 键 词：激光选区熔化 高强铝合金 热处理 显微组织 拉伸性能 

分 类 号：TG166.3[金属学及工艺—热处理]