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马雁,许雁泽,王剑举.基于ANSYS模拟评估Mo单晶电子束焊接焊缝中的离散晶粒[J].稀有金属材料与工程(英文),2018,47(9):2621~2625.[Yan Ma,Yanze Xu and 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.]
Assessment of Stray Grain Formation in Weld Joint of Single Crystal Molybdenum by ANSYS FE Simulation
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Received:March 03, 2017  Revised:May 16, 2017
DOI:
Key words: stray grains  single crystal molybdenum  EBW  ANSYS
Foundation item:北京市自然科学基金
Author NameAffiliation
Yan Ma,Yanze Xu and Jianju Wang  
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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.