Authors:
Andrey Shulga (National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia)
Abstract:
A multiscale study of boron, carbon behavior and the microstructure of PM HIP compact from high temperature Ni-based superalloy produced using PREP-powder under tensile testing at high temperature was performed. This study of boron and carbon behavior related to the microstructure of the necking and fracture zones, was carried out by direct methods track autoradiography on boron using the nuclear reaction 10B(n, a)7Li and activation autoradiography on carbon using the nuclear reaction 12C(d, n)13N, metallography, SEM, EDX, OIM methods. The formation of a mesocrack was revealed as the localization of plastic deformation before fracture, followed by a significant migration of boron and, to a lesser extent, carbon, precipitation of boride and carbide phases in the loop of maximum shear stresses for the mesocrack and in shear bands. It is important, that Intensive boron migration begins in the diffuse neck. The results revealed are explained by dynamic strain aging
DOI:
https://doi.org/10.59499/WP225367097