In-Situ observation of primary gamma ' melting in Ni-base superalloy using confocal laser scanning microscopy
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Colleges, School and Institutes
High-Temperature Confocal Laser Scanning Microscopy (HT-CLSM) was used to observe the initiation of incipient melting of primary gamma' in a Ni-base superalloy, and to quantitatively determine the liquation temperature. Specimens were cycled using different heating rates (5 and 50 degrees C/s) to peak temperatures of 1200 and 1300 degrees C to observe the influence of rapid heating on the development in the gamma'-morphology. It was found that rapid heating prevented the dissolution of primary gamma', which melts leading to constitutional liquation and the formation of dendritic gamma' 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. (C) 2011 Elsevier Inc. All rights reserved.
|Number of pages||8|
|Publication status||Published - 1 Aug 2011|
- Constitutional liquation, Nickel-base superalloys, In-situ studies, Confocal laser scanning microscopy, Microstructure