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GH4169合金扩散连接界面区热变形特性研究
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1.沈阳航空航天大学民用航空学院;2.中国科学院金属研究所

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Research on thermal deformation characteristics of diffusion-bonded interface region in GH4169 alloy
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Institute of Metal Research, Chinese Academy of Sciences

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    摘要:

    扩散界面“连接线”是镍基高温合金扩散连接区的典型特征,会显著影响扩散连接高温合金的力学性能,热变形加工是改善扩散界面组织与性能的有效方法。本文采用Gleeble 3800热机械模拟实验机对GH4169合金扩散连接区进行热压缩实验,在变形温度为1213~1333K和应变速率为0.01~10s?1的范围内,研究了GH4169合金扩散连接区的热变形行为。结果表明,通过热变形可以有效消除GH4169合金扩散界面的“连接线”。扩散连接界面区的δ相演化情况受变形条件的影响。变形温度低于δ相的溶解温度时,残存球化的δ相阻碍再结晶形核晶粒的长大,影响后续再结晶过程,降低应变速率可以促进δ相的球化程度;变形温度高于δ相的溶解温度时,δ相溶解为再结晶提供额外的驱动力,再结晶程度显著提升。采用基于应变补偿的双曲正弦型Arrhenius本构方描述GH4169合金扩散连接区流变应力与变形条件间的关系,本构方程的计算值与实验值吻合较好。根据GH4169合金扩散连接区的动态模型构建热加工图,确定了最佳加工参数范围为:变形温度为1310~1333K、应变速率为0.01~0.05s-1。

    Abstract:

    The "bond line" of the diffusion bonding interface is a common characteristic of the diffusion-bonded region in nickel-based superalloys. It significantly impacts the performance of the diffusion joint. Thermal deformation machining is an effective method to improve the microstructure and properties of a diffusion bonding interface. In this study, the thermal deformation behavior of the GH4169 alloy diffusion-bonded region was investigated at a deformation temperature of 1213~1333 K with a strain rate of 0.01~10 s-1 using a Gleeble 3800 thermal-mechanical simulation test machine. The results show that the "bond line" in the diffusion bonding region of GH4169 alloy can be effectively eliminated through thermal deformation. The evolution of the δ phase in the diffusion bonding interface region is affected by deformation conditions. When the deformation temperature is lower than the solution temperature of the δ phase, the residual spheroidized δ phase prevents the growth of recrystallization nucleation grains and affects the subsequent recrystallization process. The spheroidization degree of the δ phase can be enhanced by reducing the strain rate. When the deformation temperature exceeds the dissolution temperature of the δ phase, the dissolution of the δ phase creates an extra driving force for recrystallization, thereby significantly enhancing the extent of recrystallization. A hyperbolic sinusoidal Arrhenius constitutive equation, incorporating strain compensation, is used to describe the correlation between flow stress and deformation conditions in the diffusion-bonded region of the GH4169 alloy. The calculated values of the constitutive equation agree with the experimental values. According to the dynamic model of the GH4169 alloy diffusion bonded region, the optimal processing parameters have been determined. The deformation temperature is 1310~1333 K, and the strain rate is 0.01~0.05 s-1.

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徐勤思,张洺川,刘意,蔡雨升,牟义强,任德春,吉海宾,雷家峰. GH4169合金扩散连接界面区热变形特性研究[J].稀有金属材料与工程,,().[Xu Qinsi, Zhang Mingchuan, Liu Yi, Cai Yusheng, Mu Yiqiang,任德春,Ji Haibin, Lei Jiafeng. Research on thermal deformation characteristics of diffusion-bonded interface region in GH4169 alloy[J]. Rare Metal Materials and Engineering,,().]
DOI:10.12442/j. issn.1002-185X.20240118

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  • 收稿日期:2024-03-05
  • 最后修改日期:2024-05-07
  • 录用日期:2024-05-08
  • 在线发布日期: 2024-06-26
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