Constitutive model for a new kind of metastable β titanium alloy during hot deformation

The constitutive model was developed to describe the relationship among flow stress, strain, strain rate, and deformation temperature completely, based on the characteristics of flow stress curves for a new kind of metastable β Ti2448 titanium alloy from isothermal hot compression tests, in a wide r...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2012-03, Vol.22 (3), p.634-641
Main Authors: WANG, Zhe-jun, QIANG, Hong-fu, WANG, Xue-ren, WANG, Guang
Format: Article
Language:English
Subjects:
constitutive model
Constitutive relationships
Deformation
dynamic recovery
dynamic recrystallization
Flow stress
hot compression
Mathematical models
metastable β titanium alloy
Softening
Strain rate
Titanium base alloys
Yield strength
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Summary:The constitutive model was developed to describe the relationship among flow stress, strain, strain rate, and deformation temperature completely, based on the characteristics of flow stress curves for a new kind of metastable β Ti2448 titanium alloy from isothermal hot compression tests, in a wide range of temperatures (1023-1123 K) and strain rates (63-0.001 s−1). During this process, the adopted hyperbolic sine function based on the unified viscoplasticity theory was used to model the flow behavior of alloy undergoing flow softening caused by dynamic recovery (DRV) at high strain rates (≥1 s−1). The standard Avrami equation was adopted to represent the softening mechanism attributed to dynamic recrystallization (DRX) at low strain rates (
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61225-9