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Effect of Multiple Repair Welding on Crack Susceptibility and Mechanical Properties of Inconel 718 Alloy Casting

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Abstract

Effect of multiple repair welding has been investigated on the crack susceptibility and mechanical properties of Inconel 718 (IN718) alloy casting. The results show a dumbbell-shaped fusion zone (FZ) with thick ends and thin in the middle portion, depending on the number of repair welding cycles. The width and length of heat-affected zone (HAZ) cracks are significantly larger than that of FZ cracks, indicating that HAZ cracks are quite severe in multiple repair welding of IN718 alloy. HAZ cracks play a significant role in decreasing the mechanical properties. The stress rupture life sharply reduces after repair welding. The hardness of FZ is close to that of HAZ and base metal (BM) region, and only a minor decrease in hardness was found from BM to FZ after linear fitting. With the increase in repair welding times, the residual stress formed during welding increases gradually based on finite element analysis. The repair welding cracking is mainly controlled by local residual stress and crystal orientation based on this study. Both FZ and HAZ crackings increase with the increase in the number of repair welding cycles; thus, it must be limited to three for IN718 alloy casting.

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Acknowledgments

This research was supported by the National Natural Science Foundation of China (Nos. 51971142, 52031012, 52090042), Aeronautical Science Foundation of China (No. 2018ZE57012), Startup Fund for Youngman Research at SJTU (No. 18X100040027), and China Scholarship Council (No. 201906235004). S.S. and W.X. performed this research without funding support.

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Authors and Affiliations

  1. Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai, 200240, China

    Maodong Kang & Jun Wang

  2. National South Aviation Industry Co., Ltd, Zhuzhou, 412000, Hunan Province, China

    Ming Jiang

  3. Physical Metallurgy and Materials Design Laboratory, Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, 15261, USA

    Soumya Sridar & Wei Xiong

  4. Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan, 430068, Hubei Province, China

    Zhixiong Xie

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  1. Maodong Kang
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Kang, M., Jiang, M., Sridar, S. et al. Effect of Multiple Repair Welding on Crack Susceptibility and Mechanical Properties of Inconel 718 Alloy Casting. J. of Materi Eng and Perform 31, 254–261 (2022). https://doi.org/10.1007/s11665-021-06173-6

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  • DOI: https://doi.org/10.1007/s11665-021-06173-6

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