The effect of cyclic-loading generated intergranular strains on the creep deformation of a polycrystalline material

A. A. Mamun*, R. J. Moat, J. Kelleher, P. J. Bouchard

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)


Intergranular strains are generated due to the incompatible deformations at grain length-scales during elastic and inelastic loading in a polycrystalline material. Estimating the effects of intergranular strains on the creep life of the material is of interest for accurate life prediction of high-temperature structural systems. In this study, the effect of the cyclic loading generated intergranular strains on the creep deformation behaviour of Type 316H austenitic stainless steel was studied using in-situ neutron diffraction. The load-controlled creep dwells introduced at various positions during tension-compression cyclic loading with different intergranular strain state but under the same applied stress showed markedly different behaviours. It is inferred that the intergranular strains are a significant contributor to the observed differences in creep deformation behaviour. Comparing the evolution of intergranular strains in various grain families during plastic and creep deformation, it was found that the grain families which deformed relatively more or less during plastic deformation behaved similarly during creep deformation. The present work shows that intergranular strains, which contribute to accelerating/decelerating creep deformation rates, need to be accounted for in current creep life assessment procedures, to obtain a more realistic creep deformation prediction under cyclic loading conditions.

Original languageEnglish
Article number100385
Number of pages10
Early online date28 Jun 2019
Publication statusPublished - 1 Sept 2019


  • Back-stress
  • Creep
  • Cyclic loading
  • Intergranular strain
  • Neutron diffraction
  • Plasticity
  • Stainless steel


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