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New constitutive model for high-temperature deformation behavior of inconel 718 superalloy
Graphical abstract Display Omitted
Highlights The flow behavior is greatly affected by strain rate and deformation temperature. Two-stage constitutive models are developed for the studied nickel-based superalloy. Isotropic internal variable can be used to describe work hardening-dynamic recovery behavior. Dissolution of δ phase induces obvious deviation between the predicted and measured results.
Abstract Hot deformation behavior of an aged inconel 718 superalloy is investigated by isothermal compression tests over wide ranges of strain rate and deformation temperature. In this study, the effects of hot deformation parameters (deformation temperature and strain rate) on flow stress are analyzed. It is found that the flow stress of the studied superalloy is significantly affected by deformation temperature and strain rate. The flow stress decreases with the decrease of strain rate or the increase of deformation temperature. Based on the experimental results, a new constitutive model is developed to describe the hot deformation behavior. For the work hardening-dynamic recovery stage, an isotropic internal variable is used to represent the plastic deformation resistance, and a viscoplastic constitutive model is developed to describe the work hardening and dynamic recovery behavior. For the dynamic softening stage, the phenomenological constitutive models, which consider the coupled effects of deformation temperature, strain rate and strain on hot deformation behavior, are developed. The predicted flow stresses are in a good agreement with the experimental ones, indicating that the developed models can accurately characterize the hot deformation behavior of the studied Ni-based superalloy.
New constitutive model for high-temperature deformation behavior of inconel 718 superalloy
Graphical abstract Display Omitted
Highlights The flow behavior is greatly affected by strain rate and deformation temperature. Two-stage constitutive models are developed for the studied nickel-based superalloy. Isotropic internal variable can be used to describe work hardening-dynamic recovery behavior. Dissolution of δ phase induces obvious deviation between the predicted and measured results.
Abstract Hot deformation behavior of an aged inconel 718 superalloy is investigated by isothermal compression tests over wide ranges of strain rate and deformation temperature. In this study, the effects of hot deformation parameters (deformation temperature and strain rate) on flow stress are analyzed. It is found that the flow stress of the studied superalloy is significantly affected by deformation temperature and strain rate. The flow stress decreases with the decrease of strain rate or the increase of deformation temperature. Based on the experimental results, a new constitutive model is developed to describe the hot deformation behavior. For the work hardening-dynamic recovery stage, an isotropic internal variable is used to represent the plastic deformation resistance, and a viscoplastic constitutive model is developed to describe the work hardening and dynamic recovery behavior. For the dynamic softening stage, the phenomenological constitutive models, which consider the coupled effects of deformation temperature, strain rate and strain on hot deformation behavior, are developed. The predicted flow stresses are in a good agreement with the experimental ones, indicating that the developed models can accurately characterize the hot deformation behavior of the studied Ni-based superalloy.
New constitutive model for high-temperature deformation behavior of inconel 718 superalloy
Lin, Y.C. (author) / Li, Kuo-Kuo (author) / Li, Hong-Bin (author) / Chen, Jian (author) / Chen, Xiao-Min (author) / Wen, Dong-Xu (author)
2015-03-02
11 pages
Article (Journal)
Electronic Resource
English
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