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Metals 2019, 9(3), 298; https://doi.org/10.3390/met9030298

Dynamic Recrystallization and Hot-Working Characteristics of Ni-Based Alloy with Different Tungsten Content

1
College of Materials and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010, China
2
Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Received: 27 January 2019 / Revised: 18 February 2019 / Accepted: 1 March 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Alloys for High-Temperature Applications)
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Abstract

The hot deformation behavior of the GY200 Ni-based alloys with different tungsten (W) content were investigated by means of hot compression tests, microscopic observations, and processing maps at temperatures between 950 °C and 1200 °C, strain rate between 0.01 s−1 and 10 s−1 with strain of 0.9. The hyperbolic-sine type constitutive equations were established between peaks tress and deformation conditions through Z parameters, and for alloys with higher W content results in higher activation energy and complete recrystallization temperature. The hot-working maps were exploited based on the experimental data. The hot-working maps showed that the instability zone extended with increasing W content. The stable domain of alloys are located in the temperature range between 1025 °C and 1200 °C and strain rate range between 0.01 s−1 and 1 s−1, dominated by the dynamic recrystallization (DRX) microstructural evolution, suited for hot deformation. The cracking on the surface of the sample compressed at 950 °C was resulted from the tensile stress, while the fracture of the sample compressed at 1200 °C was triggered by the melting of grain boundaries. View Full-Text
Keywords: GY200 Nickel base alloy; cracking mechanism; activation energy; dynamic recrystallization; hot-working maps GY200 Nickel base alloy; cracking mechanism; activation energy; dynamic recrystallization; hot-working maps
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Gong, Z.; Bao, H.; Yang, G. Dynamic Recrystallization and Hot-Working Characteristics of Ni-Based Alloy with Different Tungsten Content. Metals 2019, 9, 298.

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