Finite Element Simulation of Mechanical Properties of Selective Laser Melted Ti-6Al-4V Alloy at High Strain Rates
摘 要
采用选区激光熔化(SLM)技术制备Ti-6Al-4V合金,经真空退火热处理和热等静压处理后,研究了合金准静态和高应变速率(500~3 000 s-1)下的力学性能;对双线性材料模型进行标定,将所得到的材料参数应用于霍普金森压缩试验的有限元模拟中,并将模拟结果与试验结果进行对比。结果表明:经真空退火和热等静压处理后,SLM成形合金的组织为α相和β相,呈网篮组织形貌;与准静态条件下的相比,在高应变速率下SLM成形合金的断后伸长率得到明显提高;模拟得到的归一化真应力-真应变曲线与试验得到的相吻合,平均相对误差为2.5%,其材料参数可用于后续的瞬态冲击仿真分析中。
Abstract
Ti-6Al-4V alloy was prepared by selective laser melting (SLM) technique. After post vacuum annealing and hot isostatic pressing treatment, the mechanical properties of the alloy at quasi-static and high strain rates (500-3 000 s-1) were studied. The calibration of bi-linear material model was implemented; the obtained material parameters were applied to the finite element simulation of Hopkinson compression test, and the simulation results were compared with the test results. The results show that the microstructure of SLM formed alloy after vacuum annealing and hot isostatic pressing treatment was composed of α phase and β phase with the net basket structure morphology. Compared with that under quasi-static condition, the percentage elongation after fracture of the SLM formed alloy at high strain rates was improved significantly. The normalized true stress-true strain curve obtained by simulation was consistent with test results, and the average relative error was 2.5%, indicating the material parameters was recommended for the subsequent transient impact simulation analysis.
中图分类号 V235.13 V263.3 DOI 10.11973/jxgccl202003013
所属栏目 物理模拟与数值模拟
基金项目 国家重点研发计划资助项目(SQ2018YFB110268);上海科委科研计划项目(17DZ2281200,17DZ1120000);高性能纤维及制品教育部重点实验室(B类)项目(2232019G-02);上海市经信委项目(2018-RGZN-02036)
收稿日期 2019/2/11
修改稿日期 2020/2/20
网络出版日期
作者单位点击查看
备注李颖(1976-),男,湖北十堰人,工程师,硕士
引用该论文: LI Ying,WANG Shaohui,ZHANG Ting,LIU Chuanxin,WU Haihui,CHAI Xianghai. Finite Element Simulation of Mechanical Properties of Selective Laser Melted Ti-6Al-4V Alloy at High Strain Rates[J]. Materials for mechancial engineering, 2020, 44(3): 68~72
李颖,王少辉,张婷,刘传欣,伍海辉,柴象海. 选区激光熔化Ti-6Al-4V合金在高应变速率下力学性能的有限元模拟[J]. 机械工程材料, 2020, 44(3): 68~72
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参考文献
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【3】林鑫, 黄卫东. 应用于航空领域的金属高性能增材制造技术[J]. 中国材料进展, 2015, 34(9): 684-688.
【4】张渝, 侯慧鹏, 雷力明. 高温合金增材制造标准分析[J]. 材料导报, 2017, 31(1): 62-65.
【5】宣海军,陆晓,洪伟荣,等. 航空发动机机匣包容性研究综述[J]. 航空动力学报, 2010, 25(8): 1860-1870.
【6】FAN Z C, FENG H W. Study on selective laser melting and heat treatment of Ti-6Al-4V alloy[J]. Results in Physics, 2018, 10: 660-664.
【7】LEUDERS S, THÖNE M, RIEMER A, et al. On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance[J]. International Journal of Fatigue, 2013,48(3) 300-307.
【8】KASPEROVICH G, HAUSMANN J. Improvement of fatigue resistance and ductility of TiAl6V4 processed by selective laser melting[J]. Journal of Matererials Processing Technology, 2015, 220: 202-214.
【9】李颖,王志强,柴象海,等.航空发动机鸟撞分析中的应变率相关材料模型标定及使用研究[J].航空科学技术,2014(9):66-70.
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