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Microstructure Evolution of GH4742 Ni-Based Superalloy during Hot Forming

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Abstract

In this work, the microstructure evolution and dynamic recrystallization (DRX) mechanism of double-cone specimens of GH4742 superalloys during hot compression were studied by means of various microtechniques. Two hot deformation regimes are designed and implemented, i.e., γ single-phase region (1080-1100 °C) and γ + γ′ double-phase region (1120-1140 °C). Microstructure analysis shows that coarse carbides (> 1 μm) promote the development of DRX through PSN, and the contribution to recrystallization is more than 5 times that of the fraction of carbides. Moreover, the average recrystallized grain size of PSN is always smaller than the average DRX grain size, and it does not exceed 7 μm and even deforms at a higher temperature of 1140 °C. When deformed in the double-phase region, a large number of fine γ' particles with a diameter less than 0.8 μm hinder DRX. In addition to traditional dynamic recrystallization (DRX), twin recrystallization begins at the initial deformation twin boundary, and necklace recrystallized grains are formed inside the grains.

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Acknowledgment

This research was supported by the National Science and Technology Major Project (2017-VI-0018-0090).

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Authors and Affiliations

  1. High Temperature Materials Research Division, Central Iron & Steel Research Institute, Beijing, 100081, China

    Heyong Qin, Qiang Tian & Ping Yu

  2. College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei, China

    Wenwen Zhang, Qiang Du, Haizhu Li & Xingang Liu

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  1. Heyong Qin
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Qin, H., Tian, Q., Zhang, W. et al. Microstructure Evolution of GH4742 Ni-Based Superalloy during Hot Forming. J. of Materi Eng and Perform 31, 5652–5667 (2022). https://doi.org/10.1007/s11665-022-06636-4

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