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The Effects of Thermal History on Toughness of Ni-Based Corrosion Resistant Alloys during In Situ Hydrogen Charging

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Abstract

The thermal history of Ni-base alloys can vary across a thick section of bar or forged product during heat treatment, resulting in a variation in microstructure and mechanical properties, including hydrogen embrittlement (HE) susceptibility. While it is well-established that δ phase precipitation occurs along grain boundaries in Alloy 718, it is unclear how much δ phase is necessary to increase the HE susceptibility. This work investigates the HE susceptibility of Alloys 718 aged at industrially-relevant temperatures that span the δ precipitation threshold. The objective of the study was to determine the sensitivity of HE susceptibility to small amounts of δ phase in Alloy 718. For hydrogen embrittlement testing, incremental step load tests were performed with circular notched tensile specimens subjected to in situ cathodic charging, while crack initiation and growth were monitored using the direct current potential drop technique. For conditions with similar hardness values that spanned the δ precipitation threshold, fine, infrequent, and discontinuous δ phase precipitation resulted in an increase in HE susceptibility and increasingly intergranular fracture morphology, indicating that even a small amount of δ can increase the HE susceptibility.

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Acknowledgments

The authors gratefully acknowledge the support of the sponsors of the Advanced Steel Processing and Products Research Center (ASPPRC) at the Colorado School of Mines.

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  1. Colorado School of Mines, Golden, CO, USA

    Michelle N. Kent & Kip O. Findley

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  1. Michelle N. Kent
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Correspondence to Michelle N. Kent.

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This article is an invited submission to the Journal of Materials Engineering and Performance selected from presentations at the 29th Heat Treating Society Conference and Exposition (Heat Treat 2017) held October 24–26, 2017, in Columbus, Ohio, and the 31st Heat Treating Society Conference and Exposition (Heat Treat 2021) held September 14–16, 2021, in St. Louis, Missouri. It has been expanded from the original presentation. The issue was organized by Robert Cryderman, Colorado School of Mines; Rob C. Goldstein, Fluxtrol; Collin A. Russell, Los Alamos National Laboratory; and John Tartaglia, Element Materials Technology.

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Kent, M.N., Findley, K.O. The Effects of Thermal History on Toughness of Ni-Based Corrosion Resistant Alloys during In Situ Hydrogen Charging. J. of Materi Eng and Perform 33, 4226–4233 (2024). https://doi.org/10.1007/s11665-023-09096-6

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