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The formation and control of Laves phase in superalloy 718 welds

Journal of Materials Science volume 32, pages 1977–1984 (1997)Cite this article

Abstract

Weld heat input/cooling rate (affected by welding process, parameters, technique, tooling, etc.) was found to influence the microstructural characteristics and segregational features in alloy 718 welds, with low heat inputs proving beneficial. Laves phase formed in the interdendritic regions of the weld metals as a result of segregation. The morphology and composition of Laves phase depended strongly on heat input/cooling rate and influenced its response to subsequent homogenization post-weld heat treatment. The various factors affecting the formation and control of Laves phase in alloy 718 welds are highlighted.

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Authors and Affiliations

  1. Project Office (Materials), Defence R and D Organisation, Hyderabad, India

    CH RADHAKRISHNA

  2. Department of Metallurgical Engineering, Indian Institute of Technology, Madras, India

    K PRASAD RAO

Authors
  1. CH RADHAKRISHNA
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  2. K PRASAD RAO
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RADHAKRISHNA, C., PRASAD RAO, K. The formation and control of Laves phase in superalloy 718 welds. Journal of Materials Science 32, 1977–1984 (1997). https://doi.org/10.1023/A:1018541915113

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  • DOI: https://doi.org/10.1023/A:1018541915113

Keywords

  • Welding
  • Niobium
  • Weld Metal
  • Lave Phase
  • Interdendritic Region