Investigation of a plastic deformation inhomogeneity and failure of the corrosion-resistant bimetal under uniaxial tension

S. A. Barannikova ; Yu. V. Li ; L. B. Zuev

Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 52 (2018), pp. 25-34

Résumé

This paper is aimed to study particularities of the plastic deformation and fracture of bimetal composition based on the compound of carbon steel and high-chromium stainless steel exposed to a uniaxial tension in aggressive hydrogen-containing medium. The investigation of microstructure in a region of bimetal compounds is carried out by optical microscopy. A detailed macro-scale study of the patterns of plastic flow localization was carried out using the DIC method. Bimetal plastic deformation arises from the nucleation of stress concentration in the bimetal transition area. In the basic layer, localized deformation areas propagate along a bimetal axis with different velocity. Cladding layer does not suppress the formation of localized deformation areas in the basic layer. As a result of 6-hour electrolytic hydrogenation, the strength of bimetal has decreased insignificantly while its plasticity has increased. The fracture of the samples after hydrogenation is more ductile as compared with that of primary material. In this study, it was found that the localized plastic deformation areas are formed and evolve during the tension of 301 bimetal samples as in the initial state 1 and after 6-hour electrolytic hydrogenation throughout the plastic flow in the primary, protective, and transitional layers of bimetal.

Détail

Keywords: deformation localization, plastic flow, digital image correlation, hydrogen embrittlement, steel.