激光粉末床熔融成形Ti60合金的工艺优化和组织性能研究  

Research on the Processing Optimization,Microstructure,and Properties of Ti60 Alloy Fabricated via Laser Powder Bed Fusion

作　　者：周凡 吴凡 冯喆 王永霞[1,2] 彭艺杰 党铭吉 张哲 谭华 张凤英[3] 林鑫[1,2] ZHOU Fan;WU Fan;FENG Zhe;WANG Yongxia;PENG Yijie;DANG Mingji;ZHANG Zhe;TAN Hua;ZHANG Fengying;LIN Xin(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design,Northwestern Polytechnical University,Xi'an 710072,China;School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]西北工业大学金属高性能增材制造与创新设计工业和信息化部重点实验室,陕西西安710072 [3]长安大学材料科学与工程学院,陕西西安710064

出　　处：《铸造技术》2024年第11期1005-1014,共10页Foundry Technology

基　　金：国家重点研发计划(2022YFB4600300,2022YFB4600301);西工大特色学科基础研究项目(G2022WD);陕西省重点研发计划(2023-YBGY-359)。

摘　　要：Ti60合金具有较高的比强度且能长时间在600℃高温条件下服役,利用激光粉末床熔融(LPBF)技术成形Ti60合金有望满足航空航天等领域关键构件耐高温和轻量化的需求。系统研究了工艺参数对LPBF成形Ti60合金致密度、显微组织和显微硬度的影响规律,并在此基础上对其室温拉伸和高温拉伸性能进行评价。结果表明,LPBF成形Ti60合金的显微组织主要为细针状α′马氏体,这种组织的平均厚度与体能量密度大小呈负相关性。LPBF成形Ti60合金室温条件下的屈服强度为1164 MPa、抗拉强度为1321 MPa,伸长率为2.5%,600℃高温拉伸条件下屈服强度为532 MPa、抗拉强度为889 MPa,伸长率为16%。Ti60 alloys have a high specific strength and can be in service at 600℃for a long time.The preparation of Ti60 alloys by laser powder bed fusion(LPBF)is expected to meet the needs of high-temperature resistance and the light weight of key components in aerospace.The influence of the basic processing parameters on the microstructure and microhardness of the Ti60 alloy was systematically studied,and the tensile properties of the Ti60 alloy at room temperature and high temperature were evaluated.The results show that the laser powder bed fusion processing parameters have obvious effects on the density,microstructure and microhardness of the Ti60 alloy.The microstructure of the Ti60 alloy in the deposition state is mainly fine acicularα′martensite,and the average thickness is negatively correlated with the volumetric energy density.At room temperature,the yield strength of the Ti60 alloy is 1164 MPa,the ultimate tensile strength is 1321 MPa,and the elongation is 2.5%.At 600℃,the yield strength is 532 MPa,the ultimate tensile strength is 889 MPa,and the elongation is 16%.

关 键 词：激光粉末床熔融 Ti60合金 工艺优化 显微组织 力学性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]