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Constitutive model of GH4720Li high temperature nickel base alloy at high strain rate and large temperature range

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Title Constitutive model of GH4720Li high temperature nickel base alloy at high strain rate and large temperature range
 
Creator Chen, Jie
Wang, Zhijun
Zhang, Haifeng
Zhang, Hongtao
Yang, Qingxiang
Ye, Longhai
 
Subject Nickel-based superalloy
High strain rate
Low strain rate
Precipitate
Constitutive equation
 
Description 554-566
The dynamic mechanical properties of GH4720Li nickel base superalloy under high and low strain rates in a wide
temperature range have been studied, and a constitutive model with higher fitting progress have been established. The
experimental results show that the abnormal phenomenon of dynamic mechanical properties of GH4720Li alloy appears
under the condition of high strain rate. This is because the change of Cr (MO) content in precipitates and the change of
precipitate morphology lead to the difference of dynamic mechanical properties of GH4720Li alloy at high and low strain
rates. Besides, A new piecewise function model based on a phenomenological representation of the stress-strain curves is
proposed to describe the constitutive equation of Nickel-based superalloy GH4720Li of stress-strain curves. Meanwhile,
new methods to obtain the material constant k and C are proposed to predicted accurately the flow stress. The comparison
between calculated values and experimental values based on the new constitutive modeling shows that these methods for
obtaining material constants k and C are valid and the new function model is significant for establishing constitutive
equations of Nickel-based superalloy GH4720Li in hot deformation processes.
 
Date 2022-03-03T10:22:15Z
2022-03-03T10:22:15Z
2021-12
 
Type Article
 
Identifier 0975-1017 (Online); 0971-4588 (Print)
http://nopr.niscair.res.in/handle/123456789/59272
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJEMS Vol.28(6) [December 2021]