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Constitutive Modeling of Dynamic Recrystallization Behavior of GH80A Superalloy

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Abstract:

The dynamic recrystallization (DRX) behavior of GH80A superalloy was investigated by isothermal compression tests on a Gleeble1500 thermomechanical simulator. True stress-strain curves and deformed specimens were obtained at the temperature range of 1273-1473K and the strain rate range of 0.01-5s-1. Experimental results show that the stress-strain curves at low strain rate display a typical DRX characteristic. By regression analysis of experimental results, Materials constant n, activation energy Q and Zener-Hollomon (Z) parameter were determined, and the critical strain model and austenite grain size model for dynamic recrystallization were established as a function of deformation temperature and strain rate. The dynamic recrystallization kinetic model for GH80A was established on the basis of the Avrami equation.

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Mechanical Materials and Manufacturing Engineering III View Preview

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Periodical:

Applied Mechanics and Materials (Volume 455)

Pages:

71-76

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.455.71

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Online since:

November 2013

Authors:

Hong Ke Wang, Liwen Zhang, Sen Dong Gu, Qiu Hong Quan, Wen Fei Shen

Keywords:

Dynamic Recrystallization (DRX), GH80A, Hot Deformation, Isothermal Compression Tests

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