重熔工艺对激光选区熔化Ti-1Al-8V-5Fe合金组织及性能的影响  

Effects of Remelting on Microstructure and Properties of Ti-1Al-8V-5Fe Alloy Prepared by Selective Laser Melting

作　　者：王磊 张学哲 周全 汤慧萍[1] WANG Lei;ZHANG Xue-zhe;ZHOU Quan;TANG Hui-ping(School of Material Science and Engineering,Northeast University,Shenyang 110819,China;State Key Laboratory of Porous Metal Materials,Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]西北有色金属研究院金属多孔材料国家重点实验室,陕西西安710016

出　　处：《稀有金属与硬质合金》2022年第5期70-74,95,共6页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金海外及港澳学者合作研究基金资助项目(51829401)。

摘　　要：为消除传统铸造加工生产的Ti-1Al-8V-5Fe(Ti185)合金中的β斑,采用激光选区熔化技术使大粒径Ti185合金粉末成形,通过重熔工艺对激光选区熔化Ti185合金进行优化,并对重熔前后成形样品的顶部、中部、底部三个位置进行了组织和力学性能分析。结果表明,激光选区熔化成形的Ti185样品中存在宏观裂纹,而重熔工艺能有效抑制该裂纹的产生。激光选区熔化和重熔优化成形样品的显微组织均由等轴β相组成,且等轴晶粒的内部存在亚晶结构。通过重熔优化后的激光选区熔化成形样品的最高抗压强度为2127±120 MPa,断裂应变为21%±5%,压缩性能相比重熔前的样品有所下降。To eliminate theβspots in Ti-1 Al-8 V-5 Fe(Ti185)alloy produced by conventional casting process,the large-particle-size Ti185 alloy powder was formed by selective laser melting,and the selective laser melting Ti185 alloy was optimized by remelting process.The microstructure and mechanical properties of the top,middle and bottom positions of the formed sample before and after remelting were analyzed.The results show that macroscopic cracks exist in the Ti185 sample formed by selective laser melting,and the remelting process can effectively suppress the initiation of the cracks.The microstructures of the formed samples by selective laser melting and remelting optimization are all composed of equiaxedβphase,and subcrystalline microstructure exists inside the equiaxed grains.The maximum compressive strength of the formed sample by selective laser melting which is optimized by remelting is 2127±120 MPa,and its fracture strain is 21%±5%,which shows a decrease in compression performance compared with the sample before remelting.

关 键 词：重熔 激光选区熔化 Ti-1Al-8V-5Fe合金 显微组织 压缩性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]