Finite Element Analysis of Stress Field in Plasma Powder Deposition Manufacturing

Wang Hanlin1; Liu Guoxiang1; Wu Shengchuan2; Zhang Hai’ou2

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Finite Element Analysis of Stress Field in Plasma Powder Deposition Manufacturing
Issue 11, Pages: 838-840(2007)
Published： 2007 ，
DOI：

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[1]王汉林,刘国翔,吴圣川,张海鸥.等离子熔积制造中应力场的有限元分析[J].特种铸造及有色合金,2007(11):838-840+816.

Wang Hanlin1, Liu Guoxiang1, Wu Shengchuan2, et al. Finite Element Analysis of Stress Field in Plasma Powder Deposition Manufacturing. [J]. Special Casting & Nonferrous Alloys (11):838-840(2007)
[1]王汉林,刘国翔,吴圣川,张海鸥.等离子熔积制造中应力场的有限元分析[J].特种铸造及有色合金,2007(11):838-840+816. DOI：

Wang Hanlin1, Liu Guoxiang1, Wu Shengchuan2, et al. Finite Element Analysis of Stress Field in Plasma Powder Deposition Manufacturing. [J]. Special Casting & Nonferrous Alloys (11):838-840(2007) DOI：

摘要

在等离子熔积制造中

随着热源不断移动

熔积层不断生长。由于等离子弧属于高能束热源

移动熔积过程中熔积层极冷极热

产生热应力

在冷却后仍有较大的残余应力

易产生热裂纹。研究影响等离子熔积成形应力场的熔积运动速率和冷却条件对热裂纹的控制有重要意义。采用有限元法分析了等离子熔积成形过程中的传热过程。根据高温合金的材料特性

选取不同的熔积运动速率

计算出成形过程中的热应力场。计算结果表明

随着熔积速率的增加

热应力峰值减小

应力场分布趋向均匀

冷却后得到的残余应力较小。

Abstract

For high energy beam plasma arc

the thermal stress can be formed in the deposition layers due to the alternate heating-cooling during moving deposition

which can result in the creation of hot crack as a result of high residual stress after cooling.It is important to investigate the effects of scanning rate of stress field during plasma powder deposition and cooling conditions on hot crack.The heat transferring in plasma powder deposition is simulated by the finite element method.The thermal stress field in plasma powder deposition has been calculated through varying scanning rate according to the features of superalloy.The results reveal that with increasing scanning rate

the peak value of thermal stress can be decreased and the stress field can be more uniformly distributed

leading to the lower residual stress after cooling.