抽拉速度对单晶叶片定向凝固过程的影响

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英文篇名：Effect of Withdrawal Rate on Solidification Process of Single Crystal Turbine Blade 作者：周玉辉 ; 黄清民 ; 林荣川 英文作者：ZHOU Yuhui;HUANG Qingmin;LIN Rongchuan;College of Mechanical and Energy Engineering, Jimei University; 关键词：单晶叶片 ; 定向凝固 ; 抽拉速率 ; 数值模拟 英文关键词：single crystal turbine blade;;directional solidification;;withdrawal rate;;numerical simulation 中文刊名：ZZJS 英文刊名：Foundry Technology 机构：集美大学机械与能源工程学院; 出版日期：2018-05-18 出版单位：铸造技术 年：2018 期：v.39;No.314 基金：福建省重大科技专项(2014H0032)资助 语种：中文; 页：ZZJS201805014 页数：4 CN：05 ISSN：61-1134/TG 分类号：46-49

摘要

建立了单晶高温合金涡轮叶片定向凝固过程数值计算的有限元模型,利用Pro CAST软件模拟计算了叶片在定向凝固工艺下不同抽拉速率时叶片凝固过程的固-液界面形状、纵向温度梯度、冷却速率和二次枝晶间距,预测了抽拉速率对杂晶形成的影响。结果表明,随着抽拉速率增大,温度梯度略有降低,二次枝晶间距减小;随着抽拉速率增大,叶片冷却速率增大,而起晶器和选晶器中的冷却速率不受抽拉速率的影响。
        The FEM model of solidification process of single crystal superalloy turbine blade had been established, and the shapes of solidus-liquidus interface, temperature gradient, cooling rate and dendritic secondary arm spacing at various withdrawal rates during directional solidification process had been calculated with Pro CAST. The impact of withdrawal rate on the formation of stray grains was predicted. The results show that the temperature gradient and the dendritic secondary arm spacing decrease with the increase of withdrawal rate, and the cooling rate of the blade is found to increase with the increase of withdrawal rate, but the cooling rate in the starter block and grain selector are almost the same at various withdrawal rates.

引文

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