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Effect of Boron and Carbon on the Hot Deformation Behavior of a Novel Third Generation Nickel-Based Powder Metallurgy Superalloy WZ-A3

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Abstract

Isothermal compression tests with different conditions were performed on an as-extruded WZ-A3 alloys with different level of boron and carbon. The results show that low angle grain boundaries (LAGBs) and γ′ phases with diameter greater than 300 nm increase rapidly and Σ3 twin boundaries (TBs) decrease after hot compression deformation at lower temperature for as-extruded alloys. In addition, compared to that of as-extruded state, the grains are refined after hot compression as the compression temperature decreases. The HB\C sample (alloy with higher B and C content) has more LAGBs and less TBs as well as lower complete recrystallization zone fraction compared with those for the LB\C sample (alloy with lower B and C content) for all the same compression conditions performed. Furthermore, under all identical compression conditions performed, the HB\C sample shows a higher peak stress (σp) than that of the LB\C sample. The HB\C sample has larger area fraction and smaller average size of γ′ phases (>300 nm) than that of the LB\C sample for all the same compression conditions performed. Hence, more γ′ particles (>300 nm) in HB\C have larger average inhibition force for boundaries migration compared with that in LB\C during hot compression deformation. The area fraction of γ′ phase (>300 nm) decreases with increasing of deformation temperatures and shows different variation characteristic with small amplitude decreasing of strain rate at different constant deformation temperatures. More γ′ phases exist in samples compressed at lower temperature, inhibiting dynamic recrystallization (DRX) behavior. In addition, the dissolution rate of fine γ′ phases is faster in the LB\C sample than that in the HB\C sample especially at 1100 °C compression temperature. Boron mainly stabilizes γ′ phases by inhibiting diffusion of solute atoms (Al, Ti) during hot compression and carbon mainly contributes to the precipitation of carbides. Continuous DRX (CDRX) and discontinuous DRX (DDRX) both happen during hot compression for the as-extruded WZ-A3 alloy.

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Acknowledgment

The authors appreciate the financial supports by National Science and Technology Major Project [2017-VI-0009-0080].

Funding

This study was supported by National Science and Technology Major Project [2017-VI-0009-0080].

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Authors and Affiliations

  1. Shenzhen Wedge Central South Research Institute Co., Ltd, Shenzhen, 518000, China

    Yuan Li, Junyi Cheng, Xiangdong Ma, Yingjie He & Jianzheng Guo

  2. Powder Metallurgy Research Institute, Central South University, Changsha, 410083, China

    Jianzheng Guo

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Li, Y., Cheng, J., Ma, X. et al. Effect of Boron and Carbon on the Hot Deformation Behavior of a Novel Third Generation Nickel-Based Powder Metallurgy Superalloy WZ-A3. J. of Materi Eng and Perform 31, 5340–5357 (2022). https://doi.org/10.1007/s11665-022-06674-y

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