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基于ANSYS模擬評估Mo單晶電子束焊接焊縫中的離散晶粒
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華北電力大學(xué)核能科學(xué)與工程學(xué)院,華北電力大學(xué)核能科學(xué)與工程學(xué)院,華北電力大學(xué)核能科學(xué)與工程學(xué)院

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北京市自然科學(xué)基金


Assessment of Stray Grain Formation in Weld Joint of Single Crystal Molybdenum by ANSYS FE Simulation
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School of Nuclear Science and Engineering,North China Electric Power University,School of Nuclear Science and Engineering,North China Electric Power University,School of Nuclear Science and Engineering,North China Electric Power University

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Beijing Natural Science Foundation

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    摘要:

    以往的研究中發(fā)現(xiàn)在鉬單晶電子束焊接焊縫中形成了離散晶粒。本研究基于有限元模擬對雜散晶粒在鉬單晶焊縫中的產(chǎn)生行為進(jìn)行了分析。利用ANSYS軟件,采用雙橢球3D移動熱源,對鉬單晶圓管的電子束焊接接頭進(jìn)行有限元數(shù)值模擬。使用了用以描述晶粒離散程度的參數(shù)Φ和熔池凝固前方溫度梯度G、晶體生長速度V關(guān)系的模型。通過不同焊接工藝下的模擬結(jié)果提取溫度和溫度梯度數(shù)據(jù),獲得G和V,計算得Φ,獲得焊接功率和焊接速度對鉬單晶焊縫中雜散晶粒形成的影響。

    Abstract:

    The stray grain was observed in electron beam welded (EBW) joint of single crystal molybdenum (Mo). Finite element (FE) method, combining the theoretical analysis, is used for evaluating the stray grain formation. Temperature-dependent thermal properties of molybdenum are incorporated in the model and a 3D volumetric moving double-ellipsoid heat source is applied. The relationship between parameter Φ, describing the degree of stray grain formation, and the thermal gradient G and the growth velocity V is used. Temperature and thermal gradient data of the model are extracted from simulation results under different operating conditions, and Φ is calculated. The effects of the welding parameters, including welding power Q and welding speed S on the formation of the weld stray grain are obtained.

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馬雁,許雁澤,王劍舉.基于ANSYS模擬評估Mo單晶電子束焊接焊縫中的離散晶粒[J].稀有金屬材料與工程,2018,47(9):2621~2625.[Yan Ma, Yanze Xu, Jianju Wang. Assessment of Stray Grain Formation in Weld Joint of Single Crystal Molybdenum by ANSYS FE Simulation[J]. Rare Metal Materials and Engineering,2018,47(9):2621~2625.]
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  • 收稿日期:2017-03-03
  • 最后修改日期:2017-05-16
  • 錄用日期:2017-06-23
  • 在線發(fā)布日期: 2018-11-01
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