Abstract
This investigation examines the effect of thermal cycle on the microstructural development in a powder metallurgy (P/M) superalloy braze material. Using a vertical quench furnace, samples were quenched at various stages within the heat treatment. Microstructures were analyzed using optical microscopy and an electron microprobe. The results show that borides having a blocky morphology are stable at all temperatures, both compositionally and morphologically. Script phase undergoes a drastic change in chemistry; however, it remains morphologically stable throughout. The chemical analysis of the microstructure supports the conclusion that the extended heat treatment, which is employed in industry to homogenize the microstructure and dissolve detrimental phases, does not have a significant effect in preventing these phases from forming. By using shorter times at elevated temperatures, similar microstructures can be produced.
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Iacocca, R.G. The effect of thermal cycle on the microstructural development of a powder metallurgy superalloy braze material. Metall Mater Trans A 27, 145–153 (1996). https://doi.org/10.1007/BF02647755
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DOI: https://doi.org/10.1007/BF02647755