Stray grain formation, thermomechanical stress and solidification cracking in single crystal nickel base superalloy welds

J. W. Park, J. M. Vitek, S. S. Babu, S. A. David

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

In the present study, the effects of stray grain formation and thermomechanical stresses on solidification cracking in welds of single crystal Ni-base superalloys have been investigated. Welds were made in an asymmetric crystallographic orientation under three different processing conditions. As welding speed and power increased, stray grain formation became extensive, but only on one side of the weld. Solidification cracking also became more extensive and occurred mostly along the stray grain boundaries. The three welding processes have been simulated using the finite element method (FEM). The calculation results showed that thermomechanical stresses increase with welding speed and power, leading to increased susceptibility to cracking. These results agree well with experimental observations.

Original languageEnglish
Pages (from-to)472-482
Number of pages11
JournalScience and Technology of Welding and Joining
Volume9
Issue number6
DOIs
Publication statusPublished - 2004 Dec 1

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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