Modelling of TMF Crack Initiation in Smooth Single-Crystal Superalloy Specimens

Daniel Leidermark; Mikael Segersäll; Johan Moverare; Kjell Simonsson

doi:10.4028/www.scientific.net/AMR.891-892.1283

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 891-892Modelling of TMF Crack Initiation in Smooth...

Modelling of TMF Crack Initiation in Smooth Single-Crystal Superalloy Specimens

Abstract:

In this paper the TMF crack initiation behaviour of the single-crystal nickel-base superalloyMD2 is investigated and modelled. TMF tests were performed in both IP and OP for varying mechanicalstrain ranges in the [001] crystallographic direction until TMF crack initiation was obtained. Acrystal plasticity-creep model was used in conjunction with a critical-plane approach, to evaluate thenumber of cycles to TMF crack initiation. The critical-plane model was evaluated and calibrated ata stable TMF cycle, where the effect of the stress relaxation had attenuated. This calibrated criticalplanemodel is able to describe the TMF crack initiation, taking tension/compression asymmetry aswell as stress relaxation anisotropy into account, with good correlation to the real fatigue behaviour.

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Periodical:

Advanced Materials Research (Volumes 891-892)

Pages:

1283-1288

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.891-892.1283

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Online since:

March 2014

Authors:

Daniel Leidermark*, Mikael Segersäll, Johan Moverare, Kjell Simonsson

Keywords:

Anisotropy, Crack Initiation, Creep, Single-Crystal Superalloy, Stress Relaxation, Tension/Compression Asymmetry, Thermomechanical Fatigue

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