Abstract
Progress in the industrial design of structural components for high temperature applications very often depends on the knowledge of the mechanical behavior of the advanced materials which are employed. An anisotropic coalescence modeling of γ nickel-base superalloys used for aircraft engine blades, is presented. This method, based on micros true tural information defined by a calculated anisotropic coarsening criterion for the (γ) phase in the (γ) phase matrix, and then introduced in a Monte Carlo simulation with Kawasaki dynamics, is able to reproduce experimental rafting behavior, even more accurately than the previous too costly Monte Carlo-Finite Element approach. This rapid computation allows for incorporation of further refinements to simulate more complex situations, thermomechanical fatigue, for example.
Résumé
Les progrès dans la détermination de composants structurels industriels pour des applications à haute température reposent sur la connaissance du comportement mecanique des nouveaux matériaux envisagés. Une modélisation de la coalescence anisotropique de superalliages à base de nickel utilisés en aubes de turbines d’avion, est présentée. Cette méthode est fondée sur la connaissance de la microstructure conduisant à la definition d’un critère calculable du grossissement anisotropique de la phase (γ ’) dans la phase (γ) constituant la matrice, qui, introduit dans une simulation de Monte Carlo utilisant la dynamique de Kawasaki, permet de décrire le comportement de coalescence observé expérimentalement, même plus précisément que la précédente approche, très coûteuse, associant la technique de Monte Carlo et les éléments finis. Ce type de calcul rapide permet d’introduire d’autres rajfinements conduisant à simuler des situations plus complexes, la fatigue thermomécanique, par exemple.
much shorter computation times. This rapid computation allows for the incorporation of further refinements, for example to account for the anisotropy in the diffusion constants or to perform evolutions under non-isothermal conditions. The long term aim of this project is to be able to simulate the material behavior under more complex loading and temperature conditions, particularly in the case of thermomechanical fatigue. The success of this study shows that the incorporation of microstructural information into an approach to predict the mechanical behavior of real materials is not only a desirable goal but also an achievable one.
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© 1998 Springer-Verlag Berlin Heidelberg
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Vallés, J.L., Arrell, D.J. (1998). Modeling of Anisotropic Coalescence of γ’ in Superalloys. In: Caliste, JP., Truyol, A., Westbrook, J.H. (eds) Thermodynamic Modeling and Materials Data Engineering. Data and Knowledge in a Changing World. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72207-3_36
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DOI: https://doi.org/10.1007/978-3-642-72207-3_36
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