Modeling of microstructural evolution in an MCrAlY overlay coating on different superalloy substrates

Karunaratne, Mudith; Di Martino, Irene; Ogden, Sarah L.; Oates, David L.; Thomson, Rachel

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Modeling of microstructural evolution in an MCrAlY overlay coating on different superalloy substrates

journal contribution

posted on 2014-07-25, 14:26 authored by Mudith Karunaratne, Irene Di Martino, Sarah L. Ogden, David L. Oates, Rachel ThomsonRachel Thomson

A multicomponent, one-dimensional diffusion model that was developed for simulating microstructure evolution in coated gas turbine blade systems has been used to compare the phase structures of three MCrAlY coated superalloy systems. The model is based on finite differences and incorporates oxidation and equilibrium thermodynamic computations. The superalloy substrates considered were the nickel-based superalloy CMSX-4, a high-Cr single-crystal superalloy, and a cobalt-based MAR-M509, and these were all coated with an MCrAlY bond coat of similar composition. The results predicted by the model have been compared with similar experimental systems. The model can predict many features observed experimentally and therefore can be expected to be a useful tool in lifetime prediction and microstructural assessment of turbine blade systems based on superalloys. The work also highlighted the fact that for a given coating, the phase evolution within system is dependent on the substrate material.

Funding

The authors acknowledge the support of The Energy Programme, which is a Research Councils UK cross council initiative led by EPSRC and contributed to by ESRC, NERC, BBSRC, and STFC, and specifically the Supergen initiative [Grant numbers GR/S86334/01 and EP/ F029748].The authors thank the following companies: Alstom Power Ltd., E.ON, National Physical Laboratory (NPL), QinetiQ, Rolls-Royce plc, RWE npower, Sermatech Ltd., Siemens Industrial Turbomachinery Ltd., and Tata Steel for their valuable contributions to the project. We appreciate the support given by the NPL staff, in particular Dr. Jim Robinson, on implementing MTDATA on a parallel computation environment and RWEnpower for supporting the doctoral studies of I. Di Martino and D. L. Oates.

History

School

Aeronautical, Automotive, Chemical and Materials Engineering

Department

Materials

Published in

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

Volume

43A

Issue

2

Pages

774 - 788 (15)

Citation

KARUNARATNE, M. ... et al, 2012. Modeling of microstructural evolution in an MCrAlY overlay coating on different superalloy substrates. Metallurgical and Materials Transactions A, 43 (2), pp. 774 - 788.

Publisher

Springer / © The Minerals, Metals & Materials Society and ASM International

Version

VoR (Version of Record)

Publication date

2012

Notes

Copyright 2011 ASM International and The Minerals, Metals & Materials Society. This paper was published in Metallurgical and Materials Transactions A, Vol. 43, Issue 2, pp. 774-788 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.