摘要
选区激光熔化(SLM)技术因其独特的成形原理成为制备复杂点阵结构的理想工艺。以钛合金骨架和片状结构为研究对象,通过数值仿真和试验相结合的方法,分析了热处理工艺对结构微观组织、力学性能、断裂机制及吸能特性的影响规律。结果表明,固溶时效热处理后钛合金中α+β相均匀分布,固溶温度的增加会使片状α'相马氏体逐渐减少而β相增多;不同热处理状态下片状结构压缩强度为骨架结构的1.81~2.17倍,平台应力为后者的3.1倍,但两者弹性模量相当,同时热处理工艺对骨架结构力学性能影响较小而对片状结构影响较大;两类结构都表现出了45°结对角剪切断裂和断裂带传递的现象;骨架结构能量吸收效率远大于片状结构,但累积能量吸收量较低,热处理工艺没有提高被测结构的吸能性能。
Selective laser melting(SLM)technology is an ideal process for preparing complex lattice structures because of its unique forming principle.The effects of heat treatment on microstructure,mechanical properties,fracture mechanism and energy absorption characteristics of titanium alloy skeleton and sheet structure were analyzed by numerical simulation and experiment.The results show that theα+βphase is evenly distributed in titanium alloy after solution aging heat treatment,and theα'phase martensite gradually decreases andβphase increases with the increase of solution temperature.Under different heat treatment conditions,the compression strength of sheet structure is 1.81~2.17 times that of skeleton structure,and the stress of platform is 3.1 times that of the latter,but the elastic modulus of the two is similar.At the same time,the heat treatment process has little effect on the mechanical properties of the skeleton structure and great effect on the sheet structure.Both types of structures show the phenomenon of 45°diagonal shear fracture and fracture zone transfer.The energy absorption efficiency of the skeleton structure is much higher than that of the sheet structure,but the accumulated energy absorption amount is low.The heat treatment process does not improve the energy absorption performance of the measured structure.
作者
聂云飞
唐倩
李坤
王浩宇
吴海斌
王彬生
秦昌亮
杨震
石佳
NIE Yunfei;TANG Qian;LI Kun;WANG Haoyu;WU Haibin;WANG Binsheng;QIN Changliang;YANG Zhen;SHI Jia(College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044,China;Chongqing Key Laboratory of Metal Additive Manufacturing,Chongqing 400044,China;State Key Laboratory of Mechanical,Transmission for Advanced Equipment,Chongqing 400044,China;State Energy Group Shendong Coal Group Co.,Ltd,Ordos 017200,China;Chongqing Gearbox Co.,Ltd.,Chongqing 402263,China)
出处
《航空制造技术》
CSCD
北大核心
2024年第3期45-54,共10页
Aeronautical Manufacturing Technology
基金
国家自然科学基金重点项目(523350060)
国家自然科学基金面上项目(51975073)。
关键词
选区激光熔化(SLM)
点阵结构
热处理
力学性能
断裂机制
吸能性能
Selective laser melting(SLM)
Lattice structures
Heat treatment
Mechanical properties
Fracture mechanism
Energy absorption performance
