Effect of cooling rate on the Morphological changes in the secondary γ' precipitation in FGH97 nickel-based PM superalloy
Source abstract
Abstract
The forming and evolving mechanism of γ ′ precipitates during continuous cooling after super-solvus heat-treatment (SSHT) for a nickel-based powder metallurgy (PM) superalloy FGH97 was systematically investigated. A series of cooling rates ranging from 0.1 °C/s to 500 °C/s were carried out using the DIL 805A dynamic dilatation machine. The results show that the size of the secondary γ ′ precipitates was linearly related to the logarithm of the cooling rate, and the serrated grain boundaries became straight with the increase of cooling rate. A bimodal size distribution of γ ′ precipitates, including secondary γ ′ precipitates and tertiary γ ′ precipitates, was observed at a relatively lower cooling rate, in contrast to a monomodal size distribution of γ ′ precipitates at higher cooling rates. The morphology of the secondary γ ′ precipitates changed from spherical to cuboidal, butterfly-like and octet shapes as the cooling rate decreased, at the same time the γ / γ ` lattice mismatch increased, and the microhardness decreased. The Al elements were found to be enriched in the secondary γ ′ precipitates according to the TEM results, while Cr and Co elements were found to have a higher concentration in the γ matrix.
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Research context
OpenAlex topics: High Temperature Alloys and Creep · Aluminum Alloy Microstructure Properties · Microstructure and Mechanical Properties of Steels
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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