Journal Published Online: 11 June 2019
Volume 8, Issue 5

Constitutive Analysis of Zr-1Nb Alloy for Different Phase Regions



The hot deformation behavior of alloys that exhibit allotropy is expected to be dependent on phase/phase mixture present. Therefore, the development of a constitutive equation for finite element method (FEM) simulation of industrial hot deformation processes should consider the effect of phase/phase mixture on parameters of constitutive equation. Hot compression tests of Zr-1Nb alloy were carried out at temperatures covering single α–phase, single β–phase, and two-phase α+β, for a range of strain rates. The stress–strain data of hot compression test were corrected for adiabatic temperature rise (ATR) at a strain rate of 1 s−1 and above. Constitutive equations were developed based on phase(s) present. Developed constitutive equations were validated by experimental flow stress data and FEM simulation. FEM simulation confirmed that the phase-wise constitutive equation provides better simulation results of the industrial extrusion process. Furthermore, the ram force profile obtained from the simulation was similar to the ram force profile of the physical extrusion experiment. Thus, by using correct phase-wise constitutive parameters in FEM simulation, the ram force for industrial hot processes can be correctly predicted.

Author Information

Saxena, K. K.
Department of Mechanical Engineering, Institute of Engineering and Technology, GLA University, Mathura, Uttar Pradesh, India
Chetan, K.
Nuclear Fuel Complex Limited, Hyderabad, India
Vaibhav, K.
Nuclear Fuel Complex Limited, Hyderabad, India
Mani Krishna, K. V.
Materials Science Division, Bhabha Atomic Research Center, Mumbai, India
Pancholi, V.
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, Uttarakhand, India
Jha, S. K.
Mishra Dhatu Nigam Limited, Hyderabad, Telangana, India
Srivastava, D.
Nuclear Fuel Complex Limited, Hyderabad, India
Pages: 12
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Stock #: MPC20190020
ISSN: 2379-1365
DOI: 10.1520/MPC20190020