| Autor: |
Razumovskii, Igor M., Bykov, Yuriy G., Beresnev, A.G., Poklad, V.A., Razumovskiy, V.I. |
| Zdroj: |
Advanced Materials Research; July 2011, Vol. 278 Issue: 1 p96-101, 6p |
| Abstrakt: |
The effect of ’ particle size upon the mechanical properties of Ni base superalloy EP741NP obtained by powder metallurgy was investigated. The particle size of ’ phase in -’ 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 ’ 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 650C: 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. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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