热处理对选区激光熔化GH4061合金组织和性能的影响  

Effect of Heat Treatment on Microstructure and Properties of GH4061 Alloy by Selective Laser Melting

作　　者：张尚洲[1] 李子福 王瑞[2] 孙广宝 刘国浩 于鸿垚 ZHANG Shangzhou;LI Zifu;WANG Rui;SUN Guangbao;LIU Guohao;YU Hongyao(Institute for Advanced Studies in Precision Materials,Yantai University,Yantai 264005,China;Shanghai Jiao Tong University,Shanghai 200240,China;CISRI-Gaona Materials&Technology Co.,Ltd.,Beijing 100081,China)

机构地区：[1]烟台大学精准材料高等研究院,烟台264005 [2]上海交通大学,上海200240 [3]北京钢研高纳科技股份有限公司,北京100081

出　　处：《航空制造技术》2024年第17期14-19,共6页Aeronautical Manufacturing Technology

摘　　要：采用激光选区熔化成形技术制备了GH4061合金,研究了不同热处理工艺对合金组织和性能的影响。结果表明,沉积态合金的柱状晶穿过多个熔池外延生长,晶内由胞状亚晶结构组成。随着固溶温度的升高,晶粒取向逐渐偏向(101)和(111),晶粒长大;Laves相由长链状转变为颗粒状,1060℃固溶温度时基本溶解;δ相在晶界析出,由粗大块状转变为盘状,然后再转变为短棒状,1100℃热处理时无δ相析出;980℃、1020℃、1060℃、1100℃固溶温度时γ′和γ″相平均尺寸分别为23.53 nm、24.43 nm、25.34 nm和25.66 nm。热处理后合金的室温和650℃力学性能显著提高,其中980℃固溶时效热处理试样的室温和650℃抗拉强度分别达到1342 MPa和1120 MPa,随着固溶温度的升高,1020℃、1060℃、1100℃固溶温度时试样室温抗拉强度分别下降约6.4%、8.3%和10%,650℃抗拉强度分别下降约7.9%、8.8%和11%,塑性有所提高。The study investigated the impact of heat treatment on the microstructure and tensile properties of GH4061 alloys fabricated by selective laser melting.Findings demonstrated that the as-built columnar grains experienced epitaxial growth spanning multiple molten pools,resulting in the formation of cellular substructures.Following heat treatment,as the solid solution temperature increased,there was a gradual shift in grain orientation towards the(101)and(111)crystal planes.The Laves phase transitioned from elongated chains to granular forms and dissolved at approximately 1060℃.Theδphases that precipitated at grain boundaries transformed from coarse bulk structures to disc-shaped,and eventually to short rod-shaped configurations.The average sizes ofγ′andγ″phases are 23.53 nm,24.43 nm,25.34 nm and 25.66 nm at solution temperature of 980℃,1020℃,1060℃,1100℃,respectively.The mechanical properties of the alloys after heat treatment show significant improvement at both room temperature and 650℃.Specifically,the tensile strengths at room temperature and 650℃for the sample subjected to the 980℃solid solution aging heat treatment are 1342 MPa and 1120 MPa,respectively.As the solid solution temperature increases,the room temperature tensile strength at 1020℃,1060℃and 1100℃decreases by approximately 6.4%,8.3%,and 10%than that at 980℃,respectively.At 650℃,the tensile strength at 1020℃,1060℃and 1100℃decreases by approximately 7.9%,8.8%,and 11%than that at 980℃,respectively,while the plasticity increases.

关 键 词：选区激光熔化(SLM) GH4061合金 热处理 微观组织 拉伸性能 

分 类 号：V252[一般工业技术—材料科学与工程] TG156[航空宇航科学与技术—航空宇航制造工程] TG132.3[金属学及工艺—热处理]