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

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

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.

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Acknowledgements

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

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China

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

  2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300350, China

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

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  1. Tian-Fu Wang
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  2. Xin-Jie Di
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Correspondence to Xin-Jie Di.

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Wang, TF., Di, XJ., Li, CN. et al. Effect of δ Phase on Microstructure and Hardness of Heat-Affected Zone in TIG-Welded GH4169 Superalloy. Acta Metall. Sin. (Engl. Lett.) 32, 1041–1052 (2019). https://doi.org/10.1007/s40195-018-0861-y

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  • DOI: https://doi.org/10.1007/s40195-018-0861-y

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