A theoretical review of the operation of vibratory stress relief with particular reference to the stabilization of large-scale fabrications

C. Walker

Research output: Contribution to journalArticle

6 Citations (Scopus)
145 Downloads (Pure)

Abstract

Vibratory stress relief (VSR) is widely used on large welded fabrications to stabilize the structures so that they do not distort during further machining or during operational duty. The level of applied stress achieved during VSR on such structures is only 5–10 per cent of the yield stress. It is, therefore, not obvious how these applied loads come to modify the level of residual stress. It is suggested here that the reason for the success of VSR applied to large fabrications lies (a) in the origin of the residual stresses and (b) in the partial relief of these residual stresses by the initiation of the transformation of retained austenite particles (in the size range from 1 to 25 µm) by the movement of dislocations into positions that are favourable for the nucleation of martensite embryos. The shear deformation associated with the transformation of retained austenite into martensite will reduce the residual stress field to the point where the stability of the structure may be assured.
Original languageEnglish
Pages (from-to)195-204
Number of pages10
JournalProceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
Volume225
Issue number3
DOIs
Publication statusPublished - Jul 2011

Keywords

  • residual stress
  • nucleation
  • trip steel
  • phase transformations
  • heat treatment
  • phase transformation
  • vibratory stress relief
  • constraint
  • retained austenite
  • residual-stresses

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