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Effect of δ Phase on Microstructure and Hardness of Heat-Affected Zone in TIG-Welded GH4169 Superalloy

论文摘要

The GH4169 superalloy with different content of δ-Ni3Nb phase was welded by tungsten inert gas welding.A detailed study of microstructure and hardness of heat-affected zone（HAZ） was performed in both as-welded and aged state.The results show that the precipitation of δ phase, especially the intergranular δ phase, can lead to the enrichment of Nb and Mo elements, which promote the formation of γ/Laves eutectic constituent at grain boundaries in HAZ.In as-welded state, the hardness decreases first and then increases（exhibiting a "V" shape） with distance away from fusion line in HAZ, which is governed by grain size.After aging treatment, however, the γ″ phase plays a key role in hardness and leads to the " Λ " shape profiles of hardness in HAZ.

论文目录

  • 1 Introduction
  • 2 Materials and Methods
  • 3 Results
  •   3.1 Microstructure After Heat Treatment of GH4169Superalloy
  •   3.2 Microstructure of As-Welded HAZ of GH4169Superalloy
  •   3.3 Microstructures of Aging Treatment HAZ
  •   3.4 Hardness Distribution in HAZ
  • 4 Discussion
  •   4.1 Eff ect ofδPhase on the Microstructure and Elemental Distribution of HAZ
  •   4.2 Eff ect ofδPhase on the Hardness Distribution of HAZ
  • 5 Conclusions

    • 文章来源

    类型: 期刊论文

    作者: Tian-Fu Wang,Xin-Jie Di,Cheng-Ning Li,Jia-Mei Wang,Dong-Po Wang

    来源: Acta Metallurgica Sinica(English Letters) 2019年08期

    年度: 2019

    分类: 工程科技Ⅰ辑

    专业: 金属学及金属工艺

    单位: School of Materials Science and Engineering, Tianjin University,Tianjin Key Laboratory of Advanced Joining Technology

    基金: financially supported by the National Natural Science Foundation of China (No.51774213),the Regional Demonstration Project of Marine Economic Innovation and Development (No.BHSF2017-10)

    分类号: TG132.3;TG444.74

    页码: 1041-1052

    总页数: 12

    文件大小: 12421K

    下载量: 43

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