Deformation in metals after low-temperature irradiation: Part II – Irradiation hardening, strain hardening, and stress ratios

A polycrystal plasticity model of strain localization in irradiated iron

“…Of the latter, h n and h d can be interpreted as having the physical meaning of the forest and defect hardening coefficients. The values obtained for these two parameters from the calibration exercise, h n ¼ 0.125 and h d ¼0.675 are within what can be considered reasonable in terms of experimental measurements for ferritic systems (Byun et al, 2008).…”

Analysis of tensile deformation and failure in austenitic stainless steels: Part II – Irradiation dose dependence

“…In particular, the irradiation effects on the plastic instability and fracture properties, which are important for the structural design and life time evaluation, can be evaluated by analyzing full true stress-true strain curves of irradiated materials including unstable deformation. Previous studies [7][8][9][10][11][12] investigated irradiation effects on the fracture stress, fracture strain, and strain hardening rate from tensile data of irradiated austenitic stainless steels using a linear approximation model. They showed that the strain hardening behavior at a given true stress level was not significantly influenced by irradiation [8][9][10] and that the plastic instability stress and fracture stress were dose independent [8][9][10][11][12][13].…”

“…Previous studies [7][8][9][10][11][12] investigated irradiation effects on the fracture stress, fracture strain, and strain hardening rate from tensile data of irradiated austenitic stainless steels using a linear approximation model. They showed that the strain hardening behavior at a given true stress level was not significantly influenced by irradiation [8][9][10] and that the plastic instability stress and fracture stress were dose independent [8][9][10][11][12][13]. These studies, however, assumed a linear strain hardening based on the nominal true stress and true strain relationship instead of the equivalent true stress (r T )-true strain(e T ) relationship, which represents more general stress and strain response of a material and is nearly independent of specimen geometry [12].…”

The Irradiation Effect of a Simultaneous Laser and Electron Dual-beam on Void Formation

“…vacancies and interstitials56. These primary defects govern not only material microstructural changes, such as the formation of dislocation loops and voids789, but also material mechanical property changes10, for example embrittlement11, creep12 and hardening13. Although simulation studies have been performed for decades, reports of microstructural changes caused by the simultaneous presence of SVs and FPs are limited, except under ion-electron dual-beam irradiation14.…”