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Korolëv, Russia

Razumovskii I.M.,Joint Stock Company Kompozit | Bykov Y.G.,Federal State Unitary Enterprise | Beresnev A.G.,Joint Stock Company Kompozit | Poklad V.A.,Moscow Institute of Steel And Alloys | Razumovskiy V.I.,KTH Royal Institute of Technology
Advanced Materials Research | Year: 2011

The effect of γ́ particle size upon the mechanical properties of Ni base superalloy EP741NP obtained by powder metallurgy was investigated. The particle size of γ' phase in γ- γ ́ microstructure was varied by changing the cooling rate V from the temperature of the solid solution treatment at 1200 °C (V = 80, 200 and 400 °C \ min.). After solid solution treatment billets were subjected to aging in the standard mode. It was established that as V increases from 80 to 200 °C \ min., the average particle's size of γ ́ phase decreases from 0.54 microns to 0.22 microns in the aged state. This improves the characteristics of creep and low cycle fatigue at 650?C: time to rupture under load 1000 MPa increased from 132 hours to 416 hours and low cycle fatigue increased from 42,215 to 82,016 cycles. © (2011) Trans Tech Publications, Switzerland.


Razumovskiy V.I.,KTH Royal Institute of Technology | Ruban A.V.,KTH Royal Institute of Technology | Razumovskii I.M.,Joint Stock Company Kompozit | Lozovoi A.Y.,Queens University of Belfast | And 2 more authors.
Scripta Materialia | Year: 2011

The effect of B, Si, P, Cr, Ni, Zr and Mg impurities on cohesive properties of Al and its special grain boundary (GB) Σ5 (2 1 0) [1 0 0], as well as their segregation behavior at the GB and (2 1 0) surface are studied from first principles. Our analysis determines Ni to be the best and P the worst alloying elements in regard to the overall resistance to decohesion of Al alloys. © 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


Razumovskiy V.I.,KTH Royal Institute of Technology | Razumovskiy V.I.,National University of Science and Technology "MISIS" | Razumovskii I.M.,Joint Stock Company Kompozit | Ruban A.V.,KTH Royal Institute of Technology | And 2 more authors.
Advanced Materials Research | Year: 2012

The effect of B, Si, P, Cr, Ni, Zr and Mg on cohesive properties of Al and the special grain boundary (GB) σ5 (210)[100], as well as their segregation behavior at the GB and the (210) surface are studied by first principles method. The analysis of these parameters allows us to single out Ni as the best and phosphorus as the worst interatomic bond strengthening alloying elements. © (2012) Trans Tech Publications, Switzerland.


Razumovskii I.M.,Joint Stock Company Kompozit | Tikhonov A.A.,Joint Stock Company Kompozit | Marinin S.F.,Joint Stock Company Kompozit | Logunov A.V.,Joint Stock Company Kompozit | Beresnev A.G.,Joint Stock Company Kompozit
Advanced Materials Research | Year: 2011

Typical defects of the cast engine blades from Ni base superalloys in the as-cast state and after long operation were investigated: the cast porosity, internal and external microcracs. The initial cast porosity and voids, which have appeared during long operation, reduce the fatigue and other service characteristics of the blades from Ni base superalloys. Hot isostatic pressing (HIP) reduces the size and number of micropores in the cast blades from Ni base superalloys with a polycrystalline (alloy GS6U) and single crystal (alloy GS32) structures. As a result, HIP improves the mechanical properties of the blades. Application of the HIP, together with the standard heat treatment in the renovation of the blades after long operation can provide a virtually complete restoration of their structure and efficiency. © (2011) Trans Tech Publications, Switzerland.

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