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闫学伟,王润楠,唐宁,郭雄,马德新,许庆彦,柳百成.重燃叶片定向凝固宏/微观数值模拟及实验研究[J].稀有金属材料与工程(英文),2018,47(6):1878~1883.[Yan Xuewei,Wang Runnan,Tang Ning,Guo Xiong,Ma Dexin,Xu Qingyan and Liu Baicheng.Experiment and Macro-micro Numerical Simulation of Directional Solidification for Industrial Gas Turbine Blade[J].Rare Metal Materials and Engineering,2018,47(6):1878~1883.]
Experiment and Macro-micro Numerical Simulation of Directional Solidification for Industrial Gas Turbine Blade
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Received:June 06, 2016  Revised:September 06, 2016
DOI:
Key words: Industrial gas turbine blade  directional solidification  mathematical model  numerical simulation
Foundation item:国家自然科学基金(51171089, 51374137);国家重点基础研究发展计划项目(2011CB706801);国家科技重大专项项目 (2012ZX04012-011, 2011ZX04014-052, 2009ZX04006-041)
Author NameAffiliation
Yan Xuewei,Wang Runnan,Tang Ning,Guo Xiong,Ma Dexin,Xu Qingyan and Liu Baicheng  
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Abstract:
      Directional solidification process of industrial gas turbine blades (IGTs) was studied based on temperature field and the microstructure was investigated by both simulation and experimental methods. Mathematical model of nonuniform meshes was built to compute temperature field, which improved the computation efficiency effectively. The evolvement rule of mushy zone was analyzed based on simulation results of temperature field. Interpolation algorithm and cellular automaton finite difference (CAFD) model were used to predict the microstructure growth of IGTs. Pouring experiments were carried out, and experiment results agree well with simulation results. Combining with electron backscattered diffraction (EBSD), some common defectsSofScastingsSwereSanalyzed, and theScorresponding preventionSmeasuresSwereSput forward. Primary dendrite arm space (PDAS) and secondary dendrite arm space (SDAS) were calculated considering the influence of solute diffusion and solidification rate, and dendrite morphology was observed by optical microscopy (OM). The results revealed that PDAS and SDAS changed in different transverse section of IGTs. The solidification characteristics of IGTs were studied through macro and micro perspective in order to provide help for industrial production.