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Diffraction measurements for evaluating plastic strain in A533B ferritic steel - a feasibility study

Most predictive models of metallic-component integrity require knowledge of residual stress, applied stress and macroscopic plastic strain. Majority of literature focuses on residual stress rather than plastic-strain measurement. However, knowledge of latter is also required as it alters the failure characteristics of a component. Earlier pioneering research (Daymond et al., J. Appl. Phys., 82, 1554–62, 1997) suggested that plastic strain in austenitic stainless steels could be measured utilising neutron diffraction. Paper demonstrates that neutron diffraction can also be used to measure plastic-strain magnitudes in ferritic steels and presents results from nuclear-reactor pressure vessel.