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重燃葉片定向凝固宏/微觀數(shù)值模擬及實驗研究
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清華大學(xué)材料學(xué)院先進成形制造教育部重點實驗室,清華大學(xué)材料學(xué)院先進成形制造教育部重點實驗室,北京應(yīng)用物理與計算數(shù)學(xué)研究所,東方汽輪機有限公司,東方汽輪機有限公司,清華大學(xué)材料學(xué)院先進成形制造教育部重點實驗室,清華大學(xué)材料學(xué)院先進成形制造教育部重點實驗室

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國家自然科學(xué)基金(51171089, 51374137)；國家重點基礎(chǔ)研究發(fā)展計劃項目(2011CB706801)；國家科技重大專項項目 (2012ZX04012-011, 2011ZX04014-052, 2009ZX04006-041)


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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    摘要:

    通過模擬和實驗的方法對比研究了重燃葉片定向凝固過程宏觀溫度場及微觀組織的變化規(guī)律。建立了非均勻網(wǎng)格的求解模型, 提高了計算效率, 基于溫度場的模擬結(jié)果分析了糊狀區(qū)的演化規(guī)律。采用線性插值算法結(jié)合CAFD (Cellular Automaton Finite Difference)模型模擬了葉片的微觀組織, 并和實驗進行了對比, 模擬和實驗結(jié)果吻合良好。討論了幾種常見晶粒缺陷產(chǎn)生的原因, 提出了預(yù)防措施。采用EBSD (Electron Backscattered Diffraction)技術(shù)進一步探討了晶粒的競爭生長行為。建立了枝晶臂間距的計算模型, 模擬了葉片的枝晶臂間距分布, 并進行實驗觀察, 分析了枝晶臂間距的變化規(guī)律。從宏、微觀的角度解釋了葉片的凝固特征, 為實際生產(chǎn)提供幫助。

    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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閆學(xué)偉,王潤楠,唐寧,郭雄,馬德新,許慶彥,柳百成.重燃葉片定向凝固宏/微觀數(shù)值模擬及實驗研究[J].稀有金屬材料與工程,2018,47(6):1878~1883.[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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  • 收稿日期:2016-06-06
  • 最后修改日期:2016-09-06
  • 錄用日期:2016-09-14
  • 在線發(fā)布日期: 2018-09-06
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