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Thermal stability of bimodal grain structure in a cobalt-based superalloy subjected to high-temperature exposure

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Abstract

The present work investigates the thermal stability and mechanical properties of a Co–20Cr–15W–10Ni (wt%) alloy with a bimodal grain (BG) structure. The BG structure consisting of fine grains (FGs) and coarse grains (CGs) is thermally stable under high-temperature exposure treatments of 760 °C for 100 h and 870 °C for 100–1000 h. The size of both FGs and CGs remains no significant changes after thermal exposure treatments. The microstructural stability is associated with the slow kinetics of grain growth and the pinning of carbides. The thermal stability enables to maintain the BG structures, leading to the same mechanical properties as the sample without thermal exposure treatment. In particular, the BG alloy samples after thermal exposure treatment exhibit superior mechanical properties of both high strength and high ductility compared to the unimodal grain (UG) structured ones. The BG structure of the alloy samples after thermal exposure is capable of avoiding severe loss of ductility and retaining high strength. More specifically, the ductility of the BG alloy samples after thermal exposure treatments of 870 °C for 500–1000 h is ten times higher (44.6% vs. 3.5% and 52.6% vs. 5.0%) than that of the UG ones. The finding in the present work may give new insights into high-temperature applications of the Co–20Cr–15W–10Ni alloy and other metallic materials with a BG structure.

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Acknowledgements

This work was financially supported by the Fundamental Research Program of Korea Institute of Materials Science, Republic of Korea (No. PNK7140) and the National Key Research and Development Project, China (No. 2020YFC1107200).

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Authors and Affiliations

  1. School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China

    Cheng-Lin Li, Xin-Ming Mei & Qing-Song Mei

  2. Advanced Metals Division, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Jeong Mok Oh, Seong-Woo Choi, Jae-Keun Hong, Jong-Taek Yeom & Chan Hee Park

  3. Institute of Advanced Wear and Corrosion Resistant and Functional Materials, Jinan University, Guangzhou, 510632, China

    Zhen-Tao Yu

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  1. Cheng-Lin Li
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Correspondence to Cheng-Lin Li or Chan Hee Park.

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Li, CL., Oh, J.M., Choi, SW. et al. Thermal stability of bimodal grain structure in a cobalt-based superalloy subjected to high-temperature exposure. Rare Met. 40, 877–884 (2021). https://doi.org/10.1007/s12598-020-01627-7

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  • DOI: https://doi.org/10.1007/s12598-020-01627-7

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