Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Susceptibility of hydrogen embrittlement of Al-alloy circular bars submitted to cold drawing
Submission Author:
Pedro Paiva Brito , MG , Brazil
Co-Authors:
Frederico Tavares, diego silva, Carlos Trivellato de Carvalho Filho, Pedro Paiva Brito
Presenter: Pedro Paiva Brito
doi://10.26678/ABCM.COBEM2021.COB2021-2147
Abstract
In the present work, an analysis of the susceptibility to hydrogen embrittlement of AA6351 Al-alloy bars as a function of the reduction in the cold-drawing process was performed. The materials were initially annealed submitted to cold-work levels of 0.11, 0.18, 0.25, and 0.32% in order to introduce different levels of strain-hardening. The average hardness along the samples cross section varied between 82 and 107HV for the 0.11 and 0.32 reductions, respectively and similar hardness values were observed at the surface and interior of samples prepared from the same bars. Tensile test specimens were obtained from the cold-drawn bars were then prepared and the materials were submitted to tensile testing before and after hydrogen permeation performed by cathodic charging in a 0.6M NaCl solution. It was possible to notice a positive correlation between the amount of strain-hardening induced by cold-drawing and the susceptibility to hydrogen embrittlement. The samples submitted to the largest reductions in the drawing process exhibited a 0.80 loss in ductility and the fracture mode changed from ductile to brittle, with no signs of necking.
Keywords
Hydrogen embrittlement, Cold-drawing, fracture, Ductility
