MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Fatigue Damage Evaluation Using Electron Backscatter Diffraction
Masayuki KamayaMasatoshi Kuroda
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2011 Volume 52 Issue 6 Pages 1168-1176

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Abstract

It is important to identify residual strength against fatigue damage to ensure the structural integrity of plant components subjected to cyclic loading. In this study, the degree of fatigue damage induced in Type 316 stainless steel was estimated from the local change in crystal orientation (local misorientation) measured by electron backscatter diffraction (EBSD). Crystal orientations were identified by scanning the surfaces of samples that had been subjected to a fatigue test or a tensile test. The magnitude of the averaged local misorientation, Mave, increased as the strain amplitude and the number of cycles increased, and the relationship between strain amplitude, number of cycles and Mave was obtained. Moreover, from the correlation between Mave and another parameter, MCD, which reflects the average of the orientation spread within the grains, it was shown to be possible to distinguish whether damage was caused by cyclic loading or monotonic loading. Further investigation of the local misorientation revealed that the amplitude of fatigue loading could be estimated from the statistical distribution of local misorientation averaged for each grain. It was concluded that fatigue damage (residual fatigue strength) could be quantified by EBSD measurements using the estimated strain amplitude and the relationship between strain amplitude, number of cycles and Mave.

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© 2011 The Japan Institute of Metals and Materials
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