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Microstructural and Finite Element Analysis of Creep Failure in Dissimilar Weldment Between 9Cr and 2.25Cr Heat-Resistant Steels

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Abstract

Microstructural analysis and the creep failure mechanism of dissimilar weldment between ASTM A213 T92 (9Cr1.5W0.5MoVNbTi) and T22 (2.25Cr1Mo) heat-resistant steels are reported. The low-Cr part that has high carbon activity shows a depletion of C during postweld heat treatment. In particular, the soft carbon-depleted zone (CDZ) with the lowest hardness is surrounded by strong weld metal (WM) and the T22 heat-affected zone (HAZ). Load-displacement curves obtained by nanoindentation experiments are used to extract true stress–strain curves of the WM, the CDZ, and the T22 HAZ by using finite element methods (FEMs). Because of the mechanical properties of each region, the soft CDZ confined between harder regions is exposed to multiaxial stress. Therefore, creep voids actively form and coalesce in this CDZ and lead to macroscopic brittle fracture.

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  1. LECO is a trademark of LECO Corporation, St. Joseph, MI.

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Acknowledgments

The authors thank the Korea Evaluation Institute of Industrial Technology (Project No. 10048576) for funding and Dr. Tae-Eun Hong, Ms. Mi Rang Byeon, and Ms. Min Ji Kang (Korea Basic Science Institute) for Nano-SIMS analysis.

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Authors and Affiliations

  1. Technical Research Laboratories, POSCO, Pohang, 37859, South Korea

    Hyun Je Sung

  2. Department of Materials Science and Engineering, POSTECH, Pohang, 37673, South Korea

    Ji Hyun Moon, Min Ji Jang & Hyoung Seop Kim

  3. Graduate Institute of Ferrous Technology, POSTECH, Pohang, 37673, South Korea

    Sung-Joon Kim

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  1. Hyun Je Sung
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  2. Ji Hyun Moon
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  3. Min Ji Jang
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Correspondence to Sung-Joon Kim.

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Manuscript submitted October 24, 2017.

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Sung, H.J., Moon, J.H., Jang, M.J. et al. Microstructural and Finite Element Analysis of Creep Failure in Dissimilar Weldment Between 9Cr and 2.25Cr Heat-Resistant Steels. Metall Mater Trans A 49, 5323–5332 (2018). https://doi.org/10.1007/s11661-018-4859-x

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