Abstract
After isothermal aging at 850 °C for different hours, the microstructures as well as creep-rupture properties of a novel directionally solidified Ni-based superalloy M4706 are studied under the condition of 980 °C and 180 MPa. We found that the mean edge length of γ′ particles only increases up to 484 ± 99 nm after the aging treatment of 850 °C/5000 h, and the corner of the γ′ particle becomes more and more rounded with particle size, whereas the γ′ volume fraction remains unchanged with time. At grain boundaries, the carbide film, which is consisted of MC and M23C6 carbides, is produced after thermal exposure for 1000 h, and its content increases with time. Creep-rupture tests reveal that the creep-rupture life is reduced only from 180 ± 15 to 106 ± 15 h, and the elongation to fracture decreases from 32 ± 2% to 21 ± 1% after isothermal aging for 5000 h. Microstructural observations disclose that creep deformation is achieved mainly by dislocation climb, although shearing of γ′ particles by pairs of a/2 < 011 > dislocations also takes place occasionally. Based on the experimental results, the relationship between the creep-rupture properties and microstructures together with the creep deformation mechanisms is discussed.
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Acknowledgements
This work was financially supported by Natural Science Basic Research Plan in Shaanxi Province of China (grant number 2022JQ-314, 2022JQ-460), Research and Development Funds of Xi’an Thermal Power Research Institute Co., Ltd. (grant number TA-20-TYK03), Young Elite Scientists Sponsorship Program by CSEE (grant number JLB-2020-165), Sichuan Science and Technology Program (grant number 2019ZDZX0022), the Science & Technology Foundation of Huaneng Group Co, Ltd. (grant number HNKJ20-H41).
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Zhang, P., Yuan, Y., Niu, Q. et al. Correlation microstructural evolution with creep-rupture properties of a novel directionally solidified Ni-based superalloy M4706. J Mater Sci 57, 17812–17827 (2022). https://doi.org/10.1007/s10853-022-07735-2
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DOI: https://doi.org/10.1007/s10853-022-07735-2