空心叶片LMC定向凝固温度场和微观组织模拟

唐宁; 张航; 许庆彦; 柳百成

doi:10.15980/j.tzzz.2014.06.036

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空心叶片LMC定向凝固温度场和微观组织模拟
Numerical Simulation of Temperature Field and Microstructure during Directional Solidification Hollow Blades by LMC
2014年34卷第6期页码：561-565
纸质出版日期： 2014 ，
DOI： 10.15980/j.tzzz.2014.06.036

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[1]唐宁,张航,许庆彦,柳百成.空心叶片LMC定向凝固温度场和微观组织模拟[J].特种铸造及有色合金,2014,34(06):561-565.

Tang Ning, Zhang Hang, Xu Qingyan, et al. Numerical Simulation of Temperature Field and Microstructure during Directional Solidification Hollow Blades by LMC[J]. Special Casting & Nonferrous Alloys, 2014,34(6):561-565.
[1]唐宁,张航,许庆彦,柳百成.空心叶片LMC定向凝固温度场和微观组织模拟[J].特种铸造及有色合金,2014,34(06):561-565. DOI： 10.15980/j.tzzz.2014.06.036.

Tang Ning, Zhang Hang, Xu Qingyan, et al. Numerical Simulation of Temperature Field and Microstructure during Directional Solidification Hollow Blades by LMC[J]. Special Casting & Nonferrous Alloys, 2014,34(6):561-565. DOI： 10.15980/j.tzzz.2014.06.036.

摘要

基于自主开发的Teccast软件建立了LMC动态综合边界条件和微观组织演变模型

对不同工艺的叶片凝固过程进行了数值模拟。结果表明

与传统方法相比

LMC可得到更窄的糊状区

尤其在厚大部位防止了糊状区的宽化。同时

由于LMC具有更高的温度梯度

并且减小了糊状区下凹的趋势

从而能在更高的拉速下避免杂晶。对于空心单晶叶片

可以在热应力允许的范围内使用更高的拉速来提高生产率。

Abstract

The dynamically changing and combining boundary condition in LMC and the microstructure evolution were simulated by a self-developed software Teccast.Macro-micro structure simulation of blade was conducted at different directional solidification process.The results reveal that the narrower mushy zone can be obtained by LMC compared to the mushy zone in HRS

especially in the thick position.Because of larger temperature gradient and less concave mushy zone by LMC

stray grain can be avoided at higher withdrawal rate.To improve the product efficiency of the hollow SX blade

higher withdrawal rate can be adopted within the range limited by thermal stress.

关键词

空心单晶叶片液态金属冷却定向凝固微观组织数值模拟

Keywords

Hollow SX BladeLMCDirectional SolidificationMicrostructureNumerical Simulation

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SiC/Al-Si复合材料颗粒分布的数值模拟