On the structural changes in the nickel-base alloy EI893 during operation

Abstract

Institute of problems of mechanical engineering, RAS, 85 Belinsky st., 03024, Nizhny Novgorod, Russia A comparative qualitative and quantitative analysis of the microstructure and phase composition of the alloy EI893 (KhN65VMTYu) was performed, on the example of turbine rotor blades with different operating times. The characteristic changes in the parameters of strengthening phases were revealed, which allows to judge about the degree of degradation of the material structure during operation and the possibility of extending the life of the products with timely repairs.

Investigation of the Influence of Various Kinds of Hardening on the Surface Structure EI893

“…The changes in the microstructure of nickel-based alloys, in particular, the material HN65VMTU, after workings for 53000 -112000 hours, are considered in and it is shown that the structural-phase state changes significantly, degrades [20,21]. After heat treatment (annealing), the hardening intermetallic γ'-phase (Ni3Al, Ti) practically completely dissolved in the solid solution, and its residues have a chaotic distribution over the grain volume.…”