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

33 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

Fingerprint

grain formation
heat resistant alloys
Nickel
Superalloys
welding
solidification
Solidification
Welding
Welds
Single crystals
nickel
single crystals
finite element method
Grain boundaries
grain boundaries
magnetic permeability
Finite element method
Processing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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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.",
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Stray grain formation, thermomechanical stress and solidification cracking in single crystal nickel base superalloy welds. / Park, J. W.; Vitek, J. M.; Babu, S. S.; David, S. A.

In: Science and Technology of Welding and Joining, Vol. 9, No. 6, 01.12.2004, p. 472-482.

Research output: Contribution to journalArticle

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