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Nguejio, Josiane
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Publications (6/6 displayed)
- 2023Combined effect of a spread powder particle size distribution, surface machining and stress-relief heat treatment on microstructure, tensile and fatigue properties of 316L steel manufactured by laser powder bed fusioncitations
- 2022Fracture of Honeycombs Produced by Additive Manufacturingcitations
- 2020An investigation into the fracture behaviour of honeycombs with density gradientscitations
- 2019Comparison of microstructure features and mechanical properties for additive manufactured and wrought nickel alloys 625citations
- 2018Diffusion processes as possible mechanisms for Cr depletion at SCC crack tip
- 2017Diffusion processes as possible mechanisms for Cr depletion at SCC crack tipcitations
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document
Diffusion processes as possible mechanisms for Cr depletion at SCC crack tip
Abstract
Two mechanisms are studied to explain the asymmetrical chromium depletions observed ahead of SCC crack tips in nickel-base alloys: diffusion-induced grain boundary migration (DIGM) and plasticity-enhanced diffusion. On the one hand, DIGM is evidenced in a model Alloy 600 by focused ion beam (FIB) coupled with scanning electron microscopy (SEM) cross-section imaging and analytical transmission electron microscopy (TEM) after annealing at 500 °C under vacuum and at 340 °C after exposure to primary water. The occurrence of grain boundary migration depends on the grain boundary character and misorientation. On the other hand, the effect of plasticity on chromium diffusion in nickel single-crystals is investigated by performing diffusion tests during creep tests at 500 and 350 °C. An enhancement of Cr diffusion is observed and a linear relationship between the diffusion coefficient and strain rate is evidenced. At last, in an attempt to discriminate the two mechanisms, an analytical modeling of the Cr-depleted areas observed at propagating SCC crack tips is proposed.