Detailed Analysis of the Solution Heat Treatment of a Third-Generation Single Crystal Nickel-Base Superalloy CMSX-10K®
Metallurgical and Materials Transactions A
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Pang, H., D'Souza, N., Dong, H., Stone, H., & Rae, C. (2015). Detailed Analysis of the Solution Heat Treatment of a Third-Generation Single Crystal Nickel-Base Superalloy CMSX-10K®. Metallurgical and Materials Transactions A, 47 889-906. https://doi.org/10.1007/s11661-015-3252-2
A detailed analysis of the response of as-cast third-generation single-crystal nickel-base superalloy CMSX-10K® to solution heat treatment (SHT) has been carried out, alongside an SHT optimisation exercise. The analysis was conducted through microstructural characterisation, differential scanning calorimetry (DSC) and compositional homogeneity measurements, quantifying (i) the dissolution and microstructural evolution of the interdendritic constituents, (ii) the shift in thermo-physical characteristics of the material, and (iii) the change in compositional homogeneity across the microstructure, in order to gain further understanding of these phenomena during the progression of the SHT. During the early stages of SHT, the coarse cellular γ^/ / narrow γ channel inter-dendritic constituents which were the last areas to solidify during casting, progressively dissolve; homogenisation between these inter-dendritic areas and adjacent dendritic areas leads to a rapid increase in the incipient melting temperature T_IM. The fine γ / γ^/ morphology which were the first inter-dendritic constituents to solidify after primary γ dendrite solidification, were found to progressively coarsen; however, subsequent dissolution of these coarsened γ / γ^/ inter-dendritic areas did not result in significant increases in the T_IM until the near-complete dissolution of these interdendritic areas. After the final SHT step, residual compositional micro-segregation could still be detected across the microstructure despite the near-complete dissolution of these remnant inter-dendritic areas; even so the T_IM of the material approached the solidus temperature of the alloy.
Superalloys, Solution Heat Treatment, Inter-dendritic Microstructure, Thermophysical analysis, Micro-segregation
The authors would like to acknowledge funding through the EPSRC/Rolls-Royce Strategic Partnership (EP/H500375/1 and EP/M005607/1). The authors also wish to express appreciation to Dr. Chris Hayward at the School of Geosciences, University of Edinburgh for carrying out the EPMA composition measurements and to Mr. Kevin Roberts of Dept. of Materials Science and Metallurgy for assistance in carrying out the solution heat treatment runs. Requests for access to the underlying research data should be directed to the corresponding author and will be considered against commercial interests and data protection.
External DOI: https://doi.org/10.1007/s11661-015-3252-2
This record's URL: https://www.repository.cam.ac.uk/handle/1810/252582
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