Paper Title:
Modeling of Flow Stress for one New Kind of Metastable β Titanium Alloy at High Temperature
  Abstract

Based on the characteristics of the flow stress curves for one new kind of metastable Ti2448 titanium alloy from isothermal hot compression tests, the constitutive model was developed to describe the relation between flow stress and strain, strain rate, deformation temperature completely. During this process, the flow behavior of alloy at high temperature undergo flow softening caused by dynamic recovery (DRV) was modeled by the adopted hyperbolic sine function based on the unified viscoplasticity theory, the further drop in flow stress after the peak value in stress-strain curves was assumed to be caused by temperature rise and the constitutive model was modified accordingly. Additionally, the material constants were determined by optimization strategies, which is a new method to solve the nonlinear constitutive equation. The stress-strain curves predicted by the developed constitutive model well agree with experimental results, which confirms that the developed constitutive model gives an accurate estimate of the flow stress of Ti2448 titanium alloy and can provide an effect method to model the flow behavior of metastable titanium alloy at high temperature.

  Info
Periodical
Advanced Materials Research (Volumes 311-313)
Chapter
Metal Alloy Materials
Edited by
Zhongning Guo
Pages
716-721
DOI
10.4028/www.scientific.net/AMR.311-313.716
Citation
Z. J. Wang, H. F. Qiang, X. R. Wang, "Modeling of Flow Stress for one New Kind of Metastable β Titanium Alloy at High Temperature", Advanced Materials Research, Vols. 311-313, pp. 716-721, 2011
Online since
August 2011
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Price
$32.00
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