The Effect of Multiaxial Stress State on Formation of Rafts in CMSX-4 Superalloy during Creep

Marek Gebura; Juraj Lapin

doi:10.4028/www.scientific.net/AMR.278.222

Paper Titles

Application of Thermodynamic and Kinetic Modeling to Diffusion Simulations in Nickel-Base Superalloy Systems
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Numerical Modelling of Stress and Strain Evolution during Solidification of a Single Crystal Superalloy
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Modelling Texturised Cast Structures in the Forging of Superalloys
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Viscoplastic Phase Field Simulation of Microstructural Evolutions under Complex Loadings in Ni-Base Superalloys
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The Effect of Multiaxial Stress State on Formation of Rafts in CMSX-4 Superalloy during Creep
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Modelling of Phase Evolution during Aluminizing Processes
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Continuum Damage Mechanics Modeling of Creep in DS GTD-111^TM Superalloy
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Behaviour of Ni-Based Alloys for Fossil-Fired Power Plant Components in the Long-Term Creep Regime
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Simulation of the External Pressure Influence on the Micro-Structural Evolution of a Single Crystal Ni-Based Superalloy
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The Effect of Multiaxial Stress State on Formation of Rafts in CMSX-4 Superalloy during Creep

Abstract:

The effect of multiaxial stress state caused by a notch effect on microstructure degradation of single crystal nickel based superalloy CMSX-4 was studied during creep at a temperature of 950 °C, under constant nominal stress of 120 MPa for 500 and 1000 h. In order to minimize surface oxidation effects on microstructure degradation and notched geometry of specimens, all experiments were performed under protective atmosphere. The geometry of creep specimens was designed with the aim to obtain defined interval of principal stresses, which is sufficiently large to get reliable microstructure response during tensile creep experiments. Flat specimens with “U-type” notch were designed using elastic finite element method (FEM) calculations. Microstructure analysis of the crept specimens showed that notches affect degradation processes of the studied superalloy significantly. FEM elastic-plastic analysis was performed to simulate creep of the notched specimens. Material creep behaviour was integrated into calculations by a subroutine using equations derived from experimentally measured data for cylindrical creep specimens tested at various constant nominal stresses. Magnitude, distribution and orientation of principal stresses resulting from the specimen loading were calculated and their effect on formation of rafts was described.

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Periodical:

Advanced Materials Research (Volume 278)

Pages:

222-227

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.278.222

Citation:

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Online since:

July 2011

Authors:

Marek Gebura, Juraj Lapin

Keywords:

Creep, Microstructure Degradation, Multiaxial Stress State, Superalloy

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Creative Commons CC BY 4.0

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