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Journal of Materials Science

, Volume 32, Issue 8, pp 1977–1984 | Cite as

The formation and control of Laves phase in superalloy 718 welds

  • CH RADHAKRISHNA
  • K PRASAD RAO
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.

Keywords

Welding Niobium Weld Metal Lave Phase Interdendritic Region 

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • CH RADHAKRISHNA
    • 1
  • K PRASAD RAO
    • 2
  1. 1.Project Office (Materials)Defence R and D OrganisationHyderabadIndia
  2. 2.Department of Metallurgical EngineeringIndian Institute of TechnologyMadrasIndia

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