CHEN, Tso-Wei; WANG, Pei-Te; KANG, Yung-Chang; WU, Bo-Cheng; TSOU, Nien-Ti; GLATZEL, Uwe; GORSSE, Stéphane; YEH, An-Chou

doi:10.1016/j.jallcom.2023.170620

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CHEN, Tso-Wei
PhD. Program in Prospective Functional Materials Industry,
High Entropy Materials Center

WANG, Pei-Te
Department of Materials Science and Engineering

KANG, Yung-Chang
Gloria Material Technology Corporation

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Journal of Alloys and Compounds. 2023, vol. 960, p. 170620

Elsevier

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This study aims to elucidate the underlying mechanism of grain boundary serration and investigate its effects on hot workability of U720Li superalloy. Industrial scale as-cast ingots were subjected to heat treatments at 1180 °C followed by different cooling rates (15 °C/s, 0.1 °C/s, 0.02 °C/s and 0.003 °C/s) prior hot deformation. With 15 °C/s fast cooling, samples possessed straight boundaries and fine L12 structured γ’ particles dispersion. When the cooling rate was decreased to 0.1 °C/s and below, continuous and discontinuous precipitation of the γ' phase led to the formations of Type-I and Type-II grain boundary serrations, respectively. Lamellar γ/γ’ behind the mobile grain boundary was observed for Type-II boundary, which exhibited larger degree of undulation than that of Type-I boundary. With increasing fractions of Type-II boundary, the hot formability of U720Li was significantly improved during compression tests at 1000 °C; 70 % reduction ratio (true strain=1.2) could be achieved without crack formation. This work presents a simple process route to improve the hot deformability of U720Li fabricated on an industrial scale.< Réduire

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Grain boundary serration tuning and its effect on hot workability of a wrought superalloy

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