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Hot deformation behavior of a new tailored cobalt-based superalloy for turbine discs

机译：新型定制的涡轮盘钴基高温合金的热变形行为

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摘要

Hot deformation behavior of a new tailored cobalt-based superalloy for turbine discs was investigated in the temperature range of 1050-1200 ℃ and the strain rate range of 0.01-10 s~(-1). The results show that the flow stress is closely related to the deformation temperature and strain rate, and the flow stress curve of the new tailored alloy belongs to a typical dynamic recrystallization (DRX) type. Microstructure observation reveals that the dominant nucleation mechanism of DRX for the new tailored alloy belongs to discontinuous DRX, while continuous DRX only acts as an assistant nucleation mechanism. The optimum processing parameters of hot working are obtained in the temperature range of 1155-1200 ℃ and the strain rate range of 0.01-0.1 s~(-1). The activation energy for the new tailored alloy is determined to be 833.0 kJ/mol, and the relationship between grain size and processing parameters is established by appropriate constitutive equations.
机译：研究了一种新型的涡轮盘专用钴基高温合金的热变形行为，温度范围为1050-1200℃，应变速率范围为0.01-10 s〜（-1）。结果表明，流变应力与变形温度和应变速率密切相关，新的定制合金的流变应力曲线属于典型的动态重结晶（DRX）类型。显微组织观察表明，新型定制合金的DRX的主要成核机理属于不连续DRX，而连续DRX仅作为辅助成核机理。在1155-1200℃的温度范围和0.01-0.1 s〜（-1）的应变率范围内可获得最佳的热加工工艺参数。确定新的定制合金的活化能为833.0 kJ / mol，并通过适当的本构方程建立晶粒尺寸与加工参数之间的关系。

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    《Journal of Materials Research》 |2020年第6期|633-643|共11页
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    Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei Anhui 230031 China and University of Science and Technology of China Hefei Anhui 230026 China;

    Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei Anhui 230031 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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