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Effect of Post Weld Heat Treatment on Cryogenic Mechanical Properties of Electron Beam Welded Cast Inconel 718

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Abstract

Electron beam welding of pre-aged cast 718 produced a slender Laves phase, while welds from solutionized cast 718 exhibited a blocky Laves phase with an initial stage of δ precipitation and formation of γ′+γ″ strengtheners after post weld heat treatment (PWHT). The presence of primary strengthener and coarse Laves particles in PWHT weld may cause reduction of the micro-plastic zone ahead of a crack, leading to a significant decrease in Charpy impact toughness at 77 K (−196 °C).

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This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF-2012M1A3A3A03033460).

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Authors and Affiliations

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

    Sang-Hyun Bae (Graduate Student), Soon-Il Kwon (Graduate Student), Joong-Geun Yoon (Graduate Student) & Hyun-Uk Hong (Professor)

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

    Je-Hyun Lee (Professor), Jeong-Hyeon Do (Senior Researcher), In-Soo Kim (Principal Researcher), Baig-Gyu Choi (Principal Researcher) & Chang-Yong Jo (Principal Researcher)

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  1. Sang-Hyun Bae
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  2. Soon-Il Kwon
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Correspondence to Hyun-Uk Hong.

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Manuscript submitted August 25, 2013.

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Bae, SH., Kwon, SI., Yoon, JG. et al. Effect of Post Weld Heat Treatment on Cryogenic Mechanical Properties of Electron Beam Welded Cast Inconel 718. Metall Mater Trans A 45, 537–542 (2014). https://doi.org/10.1007/s11661-013-2133-9

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  • DOI: https://doi.org/10.1007/s11661-013-2133-9

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