三维打印TC4的金相分析与力学特性试验  

Metallographic Analysis and Mechanical Property Test of 3D Printed TC4

作　　者：吴高生 周瑞红[1] 杨叶[1] 张尚雄 解菲菲 Wu Gaosheng;Zhou Ruihong;Yang Ye

机构地区：[1]上海航天精密机械研究所,上海201600

出　　处：《机械制造》2024年第12期37-41,91,共6页Machinery

摘　　要：对三维打印TC4钛合金材料进行金相分析与力学特性试验。通过观察三维打印TC4钛合金金相组织,分析微观结构对材料力学性能的影响。采用Gleeble试验机进行准静态力学特性试验,并采用霍普金森压杆进行高动态力学特性试验,完成力学特性研究。基于力学试验数据,通过多目标优化方法拟合,得到Johnson-Cook本构方程参数,并和传统TC4钛合金参数进行对比分析。研究结果表明,三维打印TC4钛合金金相组织是网篮组织,强度和硬度高,塑性和韧性弱。准静态加载下材料表现出应变强化和热软化效应,高动态加载下材料表现出应变软化效应。对比传统TC4钛合金,三维打印TC4钛合金本构方程参数中应变强化指数低,应变率强化因数高。Metallographic analysis and mechanical property test of 3D printed TC4 titanium alloy material was carried out.By observing the metallographic structure of 3D printed TC4 titanium alloy,the influence of microstructure on the mechanical property of the material was analyzed.The quasi-static mechanical property test was carried out by the Gleeble testing machine,and the highly dynamic mechanical property test was carried out by the Hopkinson pressure rod to complete the mechanical property study.Based on the mechanical test data,the parameter of the Johnson-Cook constitutive equation was obtained by fitting by the multi-objective optimization method,and the traditional parameter of the TC4 titanium alloy was compared and analyzed.The result shows that the metallographic structure of 3D printed TC4 titanium alloy is a mesh basket structure,with high strength and hardness,and weak plasticity and toughness.The material exhibits strain strengthening and thermal softening effects under quasi-static loading,and strain softening effect under high dynamic loading.Compared with the traditional TC4 titanium alloy,the strain strengthening index in the constitutive equation parameters of 3D printed TC4 titanium alloy is low,and the strain rate strengthening factor is high.

关 键 词：钛合金 金相 力学特性 试验 分析 

分 类 号：TG146.23[一般工业技术—材料科学与工程]