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Hot compressive deformation behavior of a new hot isostatically pressed Ni–Cr–Co based powder metallurgy superalloy
Research highlights ► Constitutive equation including the variable of strain is established. ► The dynamic RTT curve is developed. ► Flow curves show the characteristics of dynamic recovery and recrystallization. ► Flow stress decreases with increasing temperature and decreasing strain rate.
Abstract The hot compressive deformation behavior of a new hot isostatically pressed Ni–Cr–Co based powder metallurgy (P/M) superalloy was studied in the temperature range of 950–1150°C and strain rate range of 0.0003–1s−1 using Gleeble-1500 thermal simulator. The dynamic recrystallization-time–temperature (RTT) curve was developed and the constitutive equation of flow stress during hot deformation was established. The results show that the flow stress decreases with increasing deformation temperature and decreasing strain rate. The flow stress represents as the characteristic of dynamic crystallization with the increasing of strain at the deformation temperatures lower than 1100°C and strain rates higher than 0.0003s−1. The beginning time of dynamic crystallization has no linear relationship with deformation temperature in the condition of strain rate lower than 0.01s−1. Besides, the experiments verify that the hyperbolic sine model including the variable of strain reflects the changing law of flow stress during the hot deformation process.
Hot compressive deformation behavior of a new hot isostatically pressed Ni–Cr–Co based powder metallurgy superalloy
Research highlights ► Constitutive equation including the variable of strain is established. ► The dynamic RTT curve is developed. ► Flow curves show the characteristics of dynamic recovery and recrystallization. ► Flow stress decreases with increasing temperature and decreasing strain rate.
Abstract The hot compressive deformation behavior of a new hot isostatically pressed Ni–Cr–Co based powder metallurgy (P/M) superalloy was studied in the temperature range of 950–1150°C and strain rate range of 0.0003–1s−1 using Gleeble-1500 thermal simulator. The dynamic recrystallization-time–temperature (RTT) curve was developed and the constitutive equation of flow stress during hot deformation was established. The results show that the flow stress decreases with increasing deformation temperature and decreasing strain rate. The flow stress represents as the characteristic of dynamic crystallization with the increasing of strain at the deformation temperatures lower than 1100°C and strain rates higher than 0.0003s−1. The beginning time of dynamic crystallization has no linear relationship with deformation temperature in the condition of strain rate lower than 0.01s−1. Besides, the experiments verify that the hyperbolic sine model including the variable of strain reflects the changing law of flow stress during the hot deformation process.
Hot compressive deformation behavior of a new hot isostatically pressed Ni–Cr–Co based powder metallurgy superalloy
Wu, Kai (author) / Liu, Guoquan (author) / Hu, Benfu (author) / Li, Feng (author) / Zhang, Yiwen (author) / Tao, Yu (author) / Liu, Jiantao (author)
2010-12-06
8 pages
Article (Journal)
Electronic Resource
English
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