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In-situ observation of primary γ′ melting in Ni-base superalloy using confocal laser scanning microscopy

Attallah, M. M.; Terasaki, H.; Moat, R. J.; Bray, S. E.; Komizo, Y. and Preuss, M. (2011). In-situ observation of primary γ′ melting in Ni-base superalloy using confocal laser scanning microscopy. Materials Characterization, 62(8) pp. 760–767.

DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.matchar.2011.05.001
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Abstract

High-Temperature Confocal Laser Scanning Microscopy (HT-CLSM) was used to observe the initiation of incipient melting of primary γ′ in a Ni-base superalloy, and to quantitatively determine the liquation temperature. Specimens were cycled using different heating rates (5 and 50 °C/s) to peak temperatures of 1200 and 1300 °C to observe the influence of rapid heating on the development in the γ′-morphology. It was found that rapid heating prevented the dissolution of primary γ′, which melts leading to constitutional liquation and the formation of dendritic γ′ at the grain boundaries upon cooling. These observations are discussed in terms of the microstructural development of Nickel-based superalloys during welding, and their potential influence on the properties.

Item Type: Journal Item
Copyright Holders: 2011 Elsevier Inc.
ISSN: 1044-5803
Keywords: confocal laser scanning microscopy; in-situ studies; nickel-base superalloys; microstructure; constitutional liquation
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 29551
Depositing User: Richard Moat
Date Deposited: 22 Sep 2011 09:26
Last Modified: 15 Sep 2017 11:02
URI: http://oro.open.ac.uk/id/eprint/29551
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