Interdiffusion and Microstructure Simulation in Ni and Co Based Overlay Coatings on a Ni Based Superalloy at High Temperatures

Kang Yuan; Robert Eriksson; Ru Lin Peng; Xin Hai Li; Sten Johansson; Yan Dong Wang

doi:10.4028/www.scientific.net/AMR.922.850

Paper Titles

Bainitic Forging Steels for Cyclic Loading
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Tensile Fracture Characteristics of a Single Crystal Nickel-Based Superalloy
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Nitrogen-Enhanced Nanostructural Evolution and its Effect on Phase Stability in Biomedical Co-Cr-Mo Alloys
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Interface Migration with Segregation in MoSi₂-Based Lamellar Alloy Simulated by Phase-Field Method
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EB-Irradiation Induced Strengthening of Carbon Fiber Reinforced Thermoplastic Polymers
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Mechanical Properties at Elevated Temperatures of an S304H-Type Austenitic Stainless Steel Processed by Warm Rolling
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Interdiffusion and Microstructure Simulation in Ni and Co Based Overlay Coatings on a Ni Based Superalloy at High Temperatures
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Microstructural and Mechanical Characterizations of a Ductile Metastable β Titanium Alloy Subjected to Low Temperature Annealing
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Effect of Grain Size on Cryogenic Mechanical Properties of an Al-Mg-Sc Alloy
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Interdiffusion and Microstructure Simulation in Ni and Co Based Overlay Coatings on a Ni Based Superalloy at High Temperatures

Abstract:

In turbine engines, Ni or Co based alloys are used at high temperature, either as base materials, superalloys, or deposited on the surface of superalloys, as coatings. In the present study, two different MCrAlY overlay coatings, Ni and Co based, on a Ni based superalloy IN792 were aged for different times in air at three temperatures, 900°C, 1000°C and 1100°C. The aging processes were simulated by using DICTRA software by focusing on the interdiffusion behavior in the superalloy-coating systems. The results of simulation captured the main microstructural features observed and were used to analyze the diffusion behavior of alloying elements and the corresponding microstructure development. It was found that coating composition and temperature affected significantly the microstructure near the superalloy-coating interface, and their relations were mapped as a summary.