کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10156098 | 1666372 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructural evolution of an aluminide coating on alloy 625 during wet air exposure at 900â¯Â°C and 1000â¯Â°C
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The microstructural changes of the aluminized alloy 625 during cyclic oxidation in airâ¯+â¯6% H2O at 900â¯Â°C and 1000â¯Â°C were analyzed using optical metallography (OM), scanning electron microscopy (SEM) with energy and wave length dispersive X-ray analysis (EDX/WDX) as well as electron backscatter diffraction (EBSD). An in-house developed thermodynamic-kinetic procedure was employed to predict the microstructural evolution of aluminized alloy 625 during high temperature exposure by considering simultaneously occurring surface oxidation and interdiffusion processes. Due to the lack of mobility data for the relevant alloying elements in the Ï-phase, assumptions for the mobilities were made based on the value of the mobilities in α-Cr. Despite these assumptions, the calculated results were found to be in good agreement with experimental observations. The complete depletion of β-NiAl in the coating observed during exposure at 1000â¯Â°C was correctly predicted by the model. The model was also able to predict dissolution of the precipitate phases α-Cr and Ï in the interdiffusion zone during exposures at 900â¯Â°C and 1000â¯Â°C. The model was however unable to predict the formation of the μ-phase in the alloy after 1000â¯h of exposure at 1000â¯Â°C. The developed modelling approach offers the potential to predict microstructural changes of aluminized nickel base alloys thus reducing cost and time consuming experimental efforts.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 354, 25 November 2018, Pages 268-280
Journal: Surface and Coatings Technology - Volume 354, 25 November 2018, Pages 268-280
نویسندگان
W. Leng, R. Pillai, P. Huczkowski, D. Naumenko, W.J. Quadakkers,