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基于有限元的激光增材过程熔化热积累模拟

唐琪, 陈静青, 陈鹏, 陈勇, 赵颖

唐琪, 陈静青, 陈鹏, 陈勇, 赵颖. 基于有限元的激光增材过程熔化热积累模拟[J]. 焊接学报, 2019, 40(7): 100-104. DOI: 10.12073/j.hjxb.2019400189
引用本文: 唐琪, 陈静青, 陈鹏, 陈勇, 赵颖. 基于有限元的激光增材过程熔化热积累模拟[J]. 焊接学报, 2019, 40(7): 100-104. DOI: 10.12073/j.hjxb.2019400189
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TANG Qi, CHEN Jingqing, CHEN Peng, CHEN Yong, ZHAO Ying. Finite element simulation of melting heat accumulation in laser additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 100-104. DOI: 10.12073/j.hjxb.2019400189
Citation: TANG Qi, CHEN Jingqing, CHEN Peng, CHEN Yong, ZHAO Ying. Finite element simulation of melting heat accumulation in laser additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 100-104. DOI: 10.12073/j.hjxb.2019400189
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基于有限元的激光增材过程熔化热积累模拟

  • 1.

    西南交通大学, 成都 610031

  • 2.

    天津工业大学, 天津 300387

基金项目: 国家重点研发计划项目（2016YFB1100202）

Finite element simulation of melting heat accumulation in laser additive manufacturing

  • 1.

    Southwest Jiaotong University, Chengdu 610031, China

  • 2.

    Tianjin Polytechnic University, Tianjin 300387, China

摘要

    摘要
  • 摘要: 采用高斯体热源对H13模具钢的单层多道选区激光熔化温度场进行了模拟.研究了S型扫描时，不同扫描长度的热积累及其对熔池形貌的影响，通过试验验证了模拟结果的正确性，并提出了减小热积累的措施.结果表明，扫描长度越短，热积累越严重，熔池在第5道时的最高温度越高.以不同扫描长度的熔化长度、熔深和熔宽的平均增长率为标准可知，它们的平均增长率分别为32.1%，27.1%和13.5%.采用单向扫描的方式可减小热积累的程度，与S形扫描路径相比，当扫描长度为6 mm时，第5道的最高温度由3 115.6℃降低到2 881.51℃，但完成相同道次的扫描所用时间是S型扫描的两倍.
    Abstract: In this paper, the temperature field of single-layer and multi-beads Selective Laser Melting (SLM) of H13 die steel was simulated by using Gauss body heat source. The heat accumulation of different scanning lengths and its effect on the morphology of molten pool during S-type scanning were studied. The correctness of the simulation was verified by experiments and an improved measure was proposed to reduce the heat accumulation. The results show that the shorter the scanning length, the more serious of the heat accumulation, and accordingly the higher the maximum temperature of the molten pool in the fifth bead. By taking the average growth rates of melting length, melting depth and melting width under different scanning lengths as the standard, the average growth rates of them were 32.1%, 27.1% and 13.5%, respectively. The maximum temperature of the fifth bead was reduced from 3 115.6℃ to 2 881.51℃ when employed a unidirectional scanning at 6 mm. However, the time of completing the same pass is twice as much as that of the S-type scanning.
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    • 参考文献(13)
  • [1] Ding X, Wang L. Heat transfer and fluid flow of molten pool during selective laser melting of AlSi10Mg powder:simulation and experiment[J]. Journal of Manufacturing Processes, 2017, 26:280-289.
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    [8] Hu H, Ding X, Wang L. Numerical analysis of heat transfer during multi-layer selective laser melting of AlSi10Mg[J]. Optik-International Journal for Light and Electron Optics, 2016, 127(20):8883-8891.
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    [10] Tang T, Felicelli S D. Numerical analysis of thermo-mechanical behavior of laser cladding process[C]//TMS Meeting&Exhibition, 2014:211-218.
    [11] Chen J, Xue L. Laser cladding of wear resistant CPM 9V tool steel on hardened H13 substrate for potential automotive tooling applications[J]. Materials Science&Technology, 2010(10):2459-2470.
    [12] Lee Y S, Zhang W. Modeling of heat transfer, fluid flow and solidification microstructure of nickel-base superalloy fabricated by laser powder bed fusion[J]. Additive Manufacturing, 2016, 12:178-188.
    [13] Pinkerton A J, Li L. Direct additive laser manufacturing using gas-and water-atomised H13 tool steel powders[J]. International Journal of Advanced Manufacturing Technology, 2005, 25(5-6):471-479.
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  • 收稿日期:  2018-01-03

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