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Effects of temperature on the β-phase depletion in MCrAlYs: a modelling and experimental study towards designing new bond coat alloys

Chen, H.; Rushworth, A.; Hou, X.; He, J.; Guo, H.

Authors

H. Chen

A. Rushworth

J. He

H. Guo



Abstract

This paper investigates the effects of varied temperature conditions on the kinetics of β-phase depletion in MCrAlYs by DICTRA diffusion simulations and experimental observations. A commercially available MCrAlY composition and two modelled compositions were examined at temperature regimes of 1000 °C, 1100 °C and 1200 °C. A previously developed temperature-dependent oxidation model was used at the boundary to examine the β-phase depletion kinetics at different temperatures. The oxide growth kinetics and the corresponding Al flux were calculated based on the oxidation model. The MCrAlY phase equilibrium calculations were conducted in Thermo-Calc and the oxidation-diffusion simulations were carried out using the finite difference diffusion software, DICTRA. It was found that the MCrAlYs exhibit a predominantly dual-phase γ + β structure at 1000 °C and above. It was revealed that varying the temperature had a strong effect on the β-phase depletion in low Al-content MCrAlYs from DICTRA simulations and available experimental measurements. In addition, it was demonstrated from the diffusion simulations that MCrAlYs with high Al content exhibit an enhanced lifetime in maintaining the two-phase structure with less β-phase depletion at high temperatures due to the high Al and β-phase content.

Journal Article Type Article
Publication Date Apr 15, 2019
Journal Surface and Coatings Technology
Print ISSN 0257-8972
Electronic ISSN 1879-3347
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 363
Pages 400-410
APA6 Citation Chen, H., Rushworth, A., Hou, X., He, J., & Guo, H. (2019). Effects of temperature on the β-phase depletion in MCrAlYs: a modelling and experimental study towards designing new bond coat alloys. Surface and Coatings Technology, 363, 400-410. https://doi.org/10.1016/j.surfcoat.2019.02.024
DOI https://doi.org/10.1016/j.surfcoat.2019.02.024
Keywords McrAlY; Phase equilibrium; β-Phase depletion; DICTRA; Al content
Publisher URL https://www.sciencedirect.com/science/article/pii/S0257897219301707

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