Authors:
A.V. Shulga
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 31 Kashirskoe Sh., Moscow 115409, Russian Federation
Abstract:
Based on the results of a multiscale experimental study of the behavior of boron, carbon, and micro-structure of HIP PM compacts of the high temperature Ni-based superalloys, during various heat treatments, as well as compression and tensile tests, performed in particular by the method autora-diography, was constructed the firstly proposed TTT diagram. Study of boron and carbon behavior in relation to microstructure was carried out by direct methods track autoradiography on boron and activation autoradiography on carbon, metallography, SEM, EDX, OIM methods. Formation of solid solution of boron, segregation of boron, and precipitation of borides, in particular, along grain bound-aries as a result of heat treatment of compacts, have been revealed and analyzed. Therefore, the time -temperature conditions for the precipitation of the boride phase were determined as the main parameters of the proposed TTT-diagram of the boride phase in comparison with the TTT-diagrams of the carbide and gamma-prime phases.
DOI:
https://doi.org/10.59499/EP235753737
