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

Mamun, A. A.; Moat, R. J.; Kelleher, J. and Bouchard, P. J. (2019). The effect of cyclic-loading generated intergranular strains on the creep deformation of a polycrystalline material. Materialia (Early Access).

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DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.mtla.2019.100385
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Abstract

Intergranular strains are generated due to the incompatible deformations at grain length-scales during plastic 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.

Item Type: Journal Item
ISSN: 2589-1529
Keywords: Creep; Intergranular strain; Stainless steel; Neutron diffraction; Back-stress; Plasticity; Cyclic loading
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Computing and Communications
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Item ID: 62292
Depositing User: ORO Import
Date Deposited: 03 Jul 2019 14:10
Last Modified: 04 Jul 2019 04:29
URI: http://oro.open.ac.uk/id/eprint/62292
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