选区激光熔化制备Hastelloy-X合金的有限元模拟及其高温蠕变性能
Finite Element Simulation and High-temperature Creep Property of Hastelloy-X Superalloy Prepared by Selective Laser Melting
摘 要
基于选区激光熔化（SLM）成型原理，利用体生热率法模拟热源模型，采用ANSYS参数化设计语言实现激光热源的移动加载，通过有限元模型模拟了Hastelloy-X合金在SLM成型过程中单层瞬态温度场和熔池的形貌，并对模拟结果进行了试验验证；研究了SLM成型试样的高温蠕变性能，并与固溶态Hastelloy-X合金热轧棒材的进行对比。结果表明：体生热率法能够较好地模拟SLM成型过程中的单层瞬态温度场，计算得到的熔池尺寸和一次枝晶间距与试验结果吻合较好；在相同蠕变试验条件下，SLM成型试样的稳态蠕变速率远低于固溶态Hastelloy-X合金热轧棒材的，但二者的蠕变应力指数相近，且均主要通过位错的移动和攀移进行蠕变变形。
选区激光熔化
温度场
有限元模拟
蠕变性能
Hastelloy-X superalloy
selective laser melting
temperature field
finite element simulation
creep property
Abstract
Based on molding principle of selective laser melting (SLM), the heat source model was simulated by body heat generation method, and the load of moving laser heat source was realized by ANSYS parametric design language (APDL); then the single-layer transient temperature field and molten pool morphology of Hastelloy-X superalloy during SLM process were simulated by finite element model. The simulation results were verified by tests. The high temperature creep property of SLM molding specimens was investigated and compared with Hastelloy-X superalloy hot-rolled rods treated by solution. The results show that the body heat generation method could simulate the single-layer transient temperature field during SLM molding well, and the calculated molten pool size and primary dendrite spacing agreed well with the experimental results. Under the same creep test condition, the steady-state creep rate of SLM molding specimen was much lower than that of Hastelloy-X superalloy hot-rolled rods treated by solution; however, the creep stress index of them were similar, and creep deformation were both dominated by movement and climbing of dislocations.
中图分类号 TN249 DOI 10.11973/jxgccl201909012
所属栏目 物理模拟与数值模拟
基金项目 上海市航空材料检测与评价专业技术服务平台项目（16DZ2290500）
收稿日期 2018/9/11
修改稿日期 2019/7/16
网络出版日期
作者单位点击查看
备注李勇(1988-),男,山东菏泽人,硕士研究生
引用该论文: LI Yong,XU Hejun,BA Fahai,HE Beibei,LI Kai. Finite Element Simulation and High-temperature Creep Property of Hastelloy-X Superalloy Prepared by Selective Laser Melting[J]. Materials for mechancial engineering, 2019, 43(9): 60～67
李勇,许鹤君,巴发海,何贝贝,李凯. 选区激光熔化制备Hastelloy-X合金的有限元模拟及其高温蠕变性能[J]. 机械工程材料, 2019, 43(9): 60～67
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【3】YADROITSEV I, BERTRAND P, SMUROV I. Parametric analysis of the selective laser melting process[J]. Applied Surface Science, 2007, 253:8064-8069.
【4】赵志国,柏林,李黎,等. 激光选区熔化成形技术的发展现状及研究进展[J]. 航空制造技术, 2014, 463(19):46-49.
【5】中国航空材料手册委员会. 中国航空材料手册[M]. 北京:中国标准出版社, 2002:224-237.
【6】WANG F. Mechanical property study on rapid additive layer manufacture Hastelloy-X alloy by selective laser melting technology[J]. International Journal of Advanced Manufacturing Technology, 2012, 58:545-551.
【7】TOMUS D, JARVIS T, WU X, et al. Controlling the microstructure of Hastelloy-X components manufactured by selective laser melting[J]. Physics Procedia,2013,41:823-827.
【8】ROBERTS I A, WANG C J, ESTERLEIN R, et al. A three-dimensional finite element analysis of the temperature field during laser melting of metal powders in additive layer manufacturing[J]. International Journal of Machine Tools and Manufacture, 2009, 49:916-923.
【9】HUANG Y, YANG L J, DU X Z, et al. Finite element analysis of thermal behavior of metal powder during selective laser melting[J]. International Journal of Thermal Science, 2016, 104:146-157.
【10】文舒,董安平,陆燕玲,等. GH536高温合金选区激光熔化温度场和残余应力的有限元模拟[J]. 金属学报, 2018, 54(3):393-403.
【11】吴文恒,张亮,何贝贝,等. 选择性激光熔化增材制造工艺过程模拟研究现状[J]. 理化检验-物理分册, 2016, 52(10):693-697.
【12】LI Y, QI H, HOU H, et al. Effects of hot isostatic pressing on microstructure and mechanical properties of Hastelloy X samples produced by selective laser melting[C]//Second International Conference on Mechanics, Materials and Structural Engineering. France:Atlantis Press, 2017:31-37.
【13】侯慧鹏, 梁永朝, 何艳丽,等. 选区激光熔化Hastelloy-X合金组织演变及拉伸性能[J]. 中国激光, 2017, 44(2):1-6.
【14】廖文俊,樊恩想,付超. 激光选区熔化Hastelloy-X合金的显微组织与拉伸性能[J]. 机械工程材料, 2018, 42(7):16-27.
【15】姚化山,史玉升,章文献,等. 金属粉末选区激光熔化成形过程温度场模拟[J]. 应用激光, 2007,27(6):456-460.
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【23】HARRISON N J, TODD I, MUMTAZ K. Reduction of micro-cracking in nickel superalloys processed by selective laser melting:A fundamental alloy design approach[J]. Acta Materialia, 2015, 94:59-68.
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【25】陈云翔,严伟,胡平,等. T/P91钢在高应力条件下蠕变行为的CDM模型模拟[J]. 金属学报, 2011, 47(11):1372-1377.
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