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Characterization of γ′ precipitates in a nickel base superalloy quenching from aging temperature at different rates

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Abstract

The characteristics of γ′ precipitates in a superalloy quenched from 1050°C at different rates were investigated using field emission scanning electron microscope (FESEM). When quenched from 1050°C, the size of primary aging γ′ precipitates has a small increase in the specimens that experienced iced-brine-quenching, oil-quenching, and air-cooling-quenching conditions and a drastic increase in the specimen that experienced a furnace-cooling-quenching condition. The cooling γ′ precipitates have unimodal distributions after quenching at the air-cooling rate and bimodal distributions after quenching at the furnace-cooling rate, but there are not these distributions in the specimens that experienced iced-brine-quenching and oil-quenching conditions. When aging at 760°C, the size of primary aging γ′ precipitates appears unaffected in the specimens that experienced iced-brine-quenching, oil-quenching, and air-cooling-quenching conditions. However, it has a drastic increase in the specimen that experienced a furnace-cooling-quenching condition, and it is interesting that the bigger cooling γ′ precipitates have a coalescence and octodendritic shape. The microhardness study indicates that the hardness has no variation in the specimens that experienced iced-brine-quenching, oil-quenching, and air-cooling-quenching conditions and has a drastic decrease in the specimens that experienced a furnace-cooling-quenching condition and obtains the minimum microhardness value 390.8 HV.

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Authors and Affiliations

  1. State Key Lab for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Hongyu Li, Xiping Song, Yanli Wang & Guoliang Chen

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  1. Hongyu Li
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  2. Xiping Song
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  3. Yanli Wang
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  4. Guoliang Chen
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Correspondence to Hongyu Li.

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Li, H., Song, X., Wang, Y. et al. Characterization of γ′ precipitates in a nickel base superalloy quenching from aging temperature at different rates. Rare Metals 29, 204–208 (2010). https://doi.org/10.1007/s12598-010-0035-1

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  • DOI: https://doi.org/10.1007/s12598-010-0035-1

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