Dissolution of Fine γ’ Precipitates of MC2 Ni-Based Single-Crystal Superalloy in Creep-Fatigue Regime

Jean Briac Le Graverend; Jonathan Cormier; Franck Gallerneau; Pascal Paulmier

doi:10.4028/www.scientific.net/AMR.278.31

Paper Titles

Dislocation Mechanisms during High Temperature Creep Experiments on MC2 Alloy
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Evolution of Raft Structure during Creep Deformation of the Ni-Based Single-Crystal Superalloy TMS-138
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Dislocation Structures in the Gamma Prime-Phase of CMSX-4 and TMS75 after Degradation under Service Conditions
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Dissolution of Fine γ’ Precipitates of MC2 Ni-Based Single-Crystal Superalloy in Creep-Fatigue Regime
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Diffraction Profile, Strain Distribution and Dislocation Densities during Stage II Creep of a Superalloy
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In Situ Investigation with Neutrons on the Evolution of γ ' Precipitates at High Temperatures in a Single Crystal Ni-Base Superalloy
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In Situ Measurement of Internal Stresses and Strain Rates by High Energy X-Ray Diffraction during High Temperature Mechanical Testing
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A Study of the Effects of Alloying Additions on TCP Phase Formation in 4^th Generation Nickel-Base Single-Crystal Superalloys
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 278Dissolution of Fine γ’ Precipitates of MC2...

Dissolution of Fine γ’ Precipitates of MC2 Ni-Based Single-Crystal Superalloy in Creep-Fatigue Regime

Abstract:

The dissolution kinetics of an ultra-fine γ’ precipitation occurring in the γ matrix between the standard secondary precipitates of MC2 Ni-based single crystal superalloy was investigated. Creep-fatigue experiments at 1050°C including an overheating at 1200°C were performed on <111> oriented specimens to study the effects of fine γ’ particles on the plastic deformation. During these experiments, a decrease of the plastic deformation rate was observed just after the temperature peak. This hardening effect disappears once the fine γ’ precipitates had been dissolved. A mean time for this hyperfine precipitation dissolution could then be highlighted. Based on both simple binary diffusion and complex diffusion analysis, the mean time for the dissolution of the fine γ’ precipitates is analyzed and compared to the experimental ones. It is shown that considering only a simple binary diffusion is not sufficient and it should be considered a more complex diffusive analysis involving additional interplays.

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Periodical:

Advanced Materials Research (Volume 278)

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31-36

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.278.31

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Online since:

July 2011

Authors:

Jean Briac Le Graverend, Jonathan Cormier, Franck Gallerneau, Pascal Paulmier

Keywords:

Creep Fatigue, Dissolution/Precipitation, High-Temperature, Micro-Structure Evolution

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