| 摘要: |
| 采用有限元方法,模拟计算了镍基合金粉末钎料在1270℃钎焊K24镍基合金时,接头在冷却过程中的热应力最大值和应力集中区.结果表明,在冷却过程中,K24合金接头的切应力主要集中在界面端点处,且切应力的最大值出现在镍基钎料/K24合金界面的右端点处,其随着温度的降低先减小后增大.同时,接头x方向拉应力最大值也出现在此处,且其随着温度的降低经历由负到正的变化过程.当承受外切切力时,接头并非在镍基钎料内部断裂,而镍基钎料/K24合金界面易成为接头的主要断裂区. |
| 关键词: 有限元模拟 K24镍基合金 残余应力 钎焊 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(50705022);哈尔滨工业大学优秀创新团队支持计划 |
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| Finite element simulation of thermal stress on brazed K24 nickel-based joint |
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ZHANG Lixia, FENG Jicai
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State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China
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| Abstract: |
| By means of finite element method, maximum value of thermal stress and stress concentration zones of K24 nickel-based alloy joint brazed at 1 270℃ were simulated in this paper.The results show:during cooling process, the shear stress of K24 alloy joint concentrates at the interface tip and the maximum value of the shear stress appears at the right tip of Ni-based brazing alloy/K24 alloy interface, which decreases and then increases during cooling process.At the same time, the maximum value of stress in x direction of K24 alloy joint also appears on this site, which changes from negative to positive during cooling.After the temperature declines to room temperature, the joint seldom fractures in brazing alloy.Ni-based brazing alloy/K24 alloy interface easily becomes fracture zone as external force acts on the joint. |
| Key words: finite element simulation K24 nickel-based alloy residual stress brazing |
