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Metallurgical Behaviour and Carbon Diffusion in Buttering Deposits Prepared With and Without Buffer Layers

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Use of a buttering deposit on ferritic steel in dissimilar metal weld (DMW) joint is a common practice in nuclear plants to connect pressure vessel components (ferritic steel) to pipelines (austenitic stainless steel). Carbon migration and metallurgical changes near fusion interface (ferritic steel–austenitic stainless steel) lead to a steeper gradient in material properties, and minimizing this gradient is the major challenge in the manufacturing of DMW joints. Inconel 82 is often deposited on ferritic steel material as buttering to reducing the gradient of physical and attaining material compatibility. Inconel 82/182 fillers are used to minimize the carbon migration, but the results are not truly adequate. In this paper, Ni–Fe alloy (chromium-free) has been used as the intermediate buffer layer in the weld buttering deposit to address the issue of carbon migration and subsequent metallurgical deterioration. The weld pads with and without buffer layers of Ni–Fe alloy have been investigated and compared in detail for metallurgical properties and carbon diffusivities. Ni–Fe buffer layer can significantly control the carbon migration which resists the metallurgical deterioration. It showed the better results in post-weld heat treatment and thermally aged conditions. The buttering deposit with Ni–Fe buffer layer could be the better choice for DMW joints requirements.

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Acknowledgments

The authors acknowledge the support given by Board of Research in Nuclear Sciences, Department of Atomic Energy (India) for present work (No. 2008/36/107-BRNS/4038A). Authors are also thankful to the Defense Metallurgical Research Laboratory (Ministry of Defense, India) for providing EPMA facility in diffusion-related study. The help extended by Mr. Paul English, Specialist Welder, MTRL, UoM is also highly appreciated.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Delhi, Hauz-Khas, New Delhi, 110016, India

    Dinesh W. Rathod, Sunil Pandey & Sivanandam Aravindan

  2. School of MACE, University of Manchester, Manchester, M13 9PL, UK

    Dinesh W. Rathod

  3. Bhabha Atomic Research Centre, Mumbai, 400085, India

    Pavan Kumar Singh

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  1. Dinesh W. Rathod
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  2. Sunil Pandey
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  3. Sivanandam Aravindan
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  4. Pavan Kumar Singh
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Correspondence to Dinesh W. Rathod.

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Rathod, D.W., Pandey, S., Aravindan, S. et al. Metallurgical Behaviour and Carbon Diffusion in Buttering Deposits Prepared With and Without Buffer Layers. Acta Metall. Sin. (Engl. Lett.) 30, 120–132 (2017). https://doi.org/10.1007/s40195-016-0487-x

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  • DOI: https://doi.org/10.1007/s40195-016-0487-x

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