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Modeling of the deformation behavior of single crystalline Nickel-based superalloys under thermal mechanical loading

  • The focus of this paper is the simulation of the thermal-mechanical fatigue behavior (TMF) of two single crystalline Nickel-based superalloys in a temperature range between 400 degrees C and 980 degrees C. The newly developed rhenium-free alloy Astra-3OptW and the rhenium-free alloy CMSX-6 are analyzed concerning the basic deformation mechanisms, i.e. elasticity, time-independent and time-dependent plasticity contributing to hardening. In detail, the relevant parameters for high temperature deformation are identified from isothermal creep experiments and used in a numerical model to simulate the deformation behavior under instationary thermal and mechanical loading. Special attention is focused on the determination of the hardening by the second phase (gamma'-precipitates) and their influence on time-dependent deformation and relaxation mechanisms. Therefore, the parameters describing the stress and temperature dependence of the creep rate (i.e. stress exponent n and activation energy Q) are interpreted in terms of a threshold stress taking into account the hardening contribution of the gamma'-phase. Thus, only a reduced effective stress is active for plastic deformation. Particular attention is focused on the accurate determination of the threshold stress as a function of temperature and applied stress from the Langeborg-Bergmann-plot. The comparison of the simulated TMF-deformation to the experimental TMF-data clearly indicates the accuracy of the model in predicting the resulting stresses induced by instationary thermal and mechanical loading. (C) 2016 Elsevier Ltd. All rights reserved.

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Metadaten
Author:Franz Wilhelm, Ernst Eugen AffeldtGND, Ernst W. Fleischmann, U. Glatzel, Joachim Hammer
DOI:https://doi.org/10.1016/j.ijfatigue.2016.12.003
Parent Title (English):International Journal of Fatigue
Publisher:Elsevier
Document Type:Article
Language:English
Year of first Publication:2017
Release Date:2022/05/04
Tag:Creep; MICROSTRUCTURAL MODEL; Modeling; PARTICLES; Plasticity; Single crystalline Nickel-based superalloys; THERMOMECHANICAL FATIGUE; Thermal-mechanical fatigue; Threshold stress concept
Volume:97
First Page:1
Last Page:8
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Werkstoffprüfung und Metallographie
Begutachtungsstatus:peer-reviewed
research focus:Produktion und Systeme
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG