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Effect of Variable Filler Composition on Tensile Properties and Impact Toughness of GTA-Welded Incoloy 800HT Superalloy

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Abstract

Incoloy 800HT is the candidate material used for the 4th generation of the nuclear industry and high-temperature gas-cooled nuclear reactors. In the present study, the effects of varying nickel content and heat input on the microstructural and mechanical properties of GTA-welded superalloy Incoloy 800HT welds were evaluated. The microstructure analysis showed that all the weld metals had various dendritic and cellular morphologies with maximum precipitation of the γ phase. The compatible filler that is Incoloy 800HT reduced the precipitation of γʹ and γʹʹ phases in the welded joints. However, the higher nickel content on the use of IN82 exhibited higher impact toughness and UTS as compared to other welds. So, owing to the higher nickel content in IN82 the weld metal of this joint exhibited the lowest corrosion rate of 1.547 mpy, whereas Incoloy 800HT filler exhibited the highest corrosion rate of 4.668 mpy. Based upon this work, it is recommended that if higher corrosion resistance is required, then the use of IN82 is recommended for welding of Incoloy 800HT.

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Authors and Affiliations

  1. Punjab Engineering College, Chandigarh, India

    Gurinder Singh & Jagmohan Datt Sharma

  2. Quest Infosys Foundation Group of Institutions, Jhanjeri, Mohali, Punjab, India

    Sandeep Singh Sandhu

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  1. Gurinder Singh
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  2. Jagmohan Datt Sharma
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Singh, G., Sharma, J.D. & Sandhu, S.S. Effect of Variable Filler Composition on Tensile Properties and Impact Toughness of GTA-Welded Incoloy 800HT Superalloy. Trans Indian Inst Met 76, 3229–3239 (2023). https://doi.org/10.1007/s12666-023-02950-0

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