The Effect of Heat Treatment on Creep Resistance of Castings from the Modified Superalloy MAR-247

Abstract:

mpact of heat treatment on durability has been evaluated in this study in conditions of high-temperature creep of castings made from nickel superalloy MAR-247 post production rejects. Castings made in the processes of modification and filtration when pouring into moulds were subject to solubilization (1185°C/2 h) with subsequent ageing (870°C/20 h). It has been found on the basis of performed tests that in conditions of high-temperature creep at temperature 980°C with stress σ = 150 MPa the resistance of specimens of coarse-grain structure was significantly higher when compared to fine-grain material. The conditions of initiation and propagation of cracks in these specimens were analysed with consideration of morphological properties of material macro-, micro-and substructure. Moreover, it has been proven that creep resistance of heat treated MAR-247 superalloy significantly improves when compared to its condition after the process of modification only. Macrostructural changes in the MAR-247 superalloy that determine the increase of superalloy creep resistance after solubilization and ageing, as observed in the tests, were also examined.

• Periodical: Solid State Phenomena (Volume 212)
• Pages: 229-236
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.212.229
• Online since: December 2013
• Authors: Marek Cieśla, Franciszek Binczyk, Marcin Mańka
• Keywords: Creep, Heat Treatment, Macrostructure, Modification, Nickel Superalloy

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