Effect of the Particle Size of γ’ Phase on the Mechanical Properties of Ni Base Superalloy

Abstract:

The effect of γ’ 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.

• Periodical: Advanced Materials Research (Volume 278)
• Pages: 96-101
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.278.96
• Online since: July 2011
• Authors: Igor M. Razumovskii, Yuriy G. Bykov, A.G. Beresnev, V.A. Poklad, V.I. Razumovskiy
• Keywords: Microstructure, Powder metallurgy, Superalloy

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