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Characterization of the Microstructures and the Cryogenic Mechanical Properties of Electron Beam Welded Inconel 718

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Abstract

The microstructures and the cryogenic mechanical properties of electron beam (EB) welds between cast and forged Inconel 718 superalloys with a thickness of 10 mm were investigated in comparison with gas tungsten arc (GTA) welds. EB welding with a heat input lower than 250 J/mm caused the formation of liquation microfissuring in the cast-side heat-affected-zone (HAZ) of the EB welds. HAZ liquation microfissuring appeared to be associated with the constitutional liquation of primary NbC carbides at the grain boundaries. Compared with the GTA welding process, the EB welding produced welds with superior microstructure, exhibiting fine dendritic structure associated with the reduction in size and fraction of the Laves phase due to the rapid cooling rate. This result was responsible for the superior mechanical properties of the EB welds at 77 K (−196 °C). Laves particles in both welds were found to provide the preferential site for the crack initiation and propagation, leading to a significant decrease in the Charpy impact toughness at 77 K (−196 °C). Crack initiation and propagation induced by Charpy impact testing were discussed in terms of the dendrite arm spacing, the Laves size and the dislocation structure ahead of the crack arisen from the fractured Laves phase in the two welds.

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Acknowledgment

This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (NRF-2012M1A3A3A03033460 and NRF-2014R1A1A1002314).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Changwon National University, 20 Changwondaehak-ro, Changwon, Gyeongnam, 641-773, Republic of Korea

    Soon Il Kwon (Graduate Student), Sang Hyun Bae (Graduate Student) & Hyun Uk Hong (Professor)

  2. High Temperature Materials Research Group, Korea Institute of Materials Science, 797 Changwondaero, Sungsan-gu, Changwon, Gyeongnam, 641-831, Republic of Korea

    Jeong Hyeon Do (Senior Researcher) & Chang Yong Jo (Principal Researcher)

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  1. Soon Il Kwon
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  2. Sang Hyun Bae
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  3. Jeong Hyeon Do
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Correspondence to Hyun Uk Hong.

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Manuscript submitted December 24, 2014.

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Kwon, S.I., Bae, S.H., Do, J.H. et al. Characterization of the Microstructures and the Cryogenic Mechanical Properties of Electron Beam Welded Inconel 718. Metall Mater Trans A 47, 777–787 (2016). https://doi.org/10.1007/s11661-015-3269-6

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  • DOI: https://doi.org/10.1007/s11661-015-3269-6

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