重型燃机大尺寸叶片定向凝固组织模拟

李海松; 杨啊涛; 张琼元; 杨照宏; 杨功显

doi:10.15980/j.tzzz.2020.09.011

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重型燃机大尺寸叶片定向凝固组织模拟
Directional Solidification Microstructure Simulation of Large Size Blade of Heavy Gas Turbine
2020年40卷第9期页码：980-984
纸质出版日期： 2020 ，
DOI： 10.15980/j.tzzz.2020.09.011

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[1]李海松,杨啊涛,张琼元,杨照宏,杨功显.重型燃机大尺寸叶片定向凝固组织模拟[J].特种铸造及有色合金,2020,40(09):980-984.

Li Haisong, Yang Atao, Zhang Qiongyuan, et al. Directional Solidification Microstructure Simulation of Large Size Blade of Heavy Gas Turbine[J]. Special Casting & Nonferrous Alloys, 2020,40(9):980-984.
[1]李海松,杨啊涛,张琼元,杨照宏,杨功显.重型燃机大尺寸叶片定向凝固组织模拟[J].特种铸造及有色合金,2020,40(09):980-984. DOI： 10.15980/j.tzzz.2020.09.011.

Li Haisong, Yang Atao, Zhang Qiongyuan, et al. Directional Solidification Microstructure Simulation of Large Size Blade of Heavy Gas Turbine[J]. Special Casting & Nonferrous Alloys, 2020,40(9):980-984. DOI： 10.15980/j.tzzz.2020.09.011.

摘要

采用CAF模型对某重型燃机大尺寸动叶片定向凝固组织进行了数值模拟。结果表明

叶根朝下组模时

柱状晶尺寸细小

偏离度和发散度较小

叶根晶粒尺寸细小

叶顶晶粒尺寸粗大;叶顶朝下组模时

柱状晶粗大

偏离度和发散度较大

叶顶晶粒细小

叶根晶粒粗大。抽拉速率对柱状晶组织的影响与组模方式相关性不大

抽拉速率越大

柱状晶尺寸越小

偏离度和发散度越小。试生产发现

数值模拟结果和试验结果符合较好。

Abstract

A three dimensional cellular automaton-finite element model was established to predict the solidification grain structures of large size blade of heavy gas turbine.The results reveal that the deviation angle and divergence angle of columnar grains are small and columnar crystal is fine when assembled with root down

meanwhile

grain size of blade root is fine

while grain size of blade top is coarse.However

the deviation angle and divergence angle of coarse columnar grain are large when assembled with tip down

meanwhile grain size of blade root is coarse

while grain size of blade top is fine.In addition

the effects of withdrawal rate on solidification structure are independent on the assembled modes.With the withdrawal rate increasing

the columnar grain size and angle of deviation and divergence are decreased.The numerical simulation results are in good agreement with the experimental ones.