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Experiment and Macro-micro Numerical Simulation of Directional Solidification for Industrial Gas Turbine Blade
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Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University,,Dongfang Turbine Co,LTD,Dongfang Turbine Co,LTD,Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University

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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.

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[Yan Xuewei, Wang Runnan, Tang Ning, Guo Xiong, Ma Dexin, Xu Qingyan, 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.]
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History
  • Received:June 06,2016
  • Revised:September 06,2016
  • Adopted:September 14,2016
  • Online: September 06,2018

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