Investigating Hot Deformation Behavior of Ti-6Al-4V Alloy with Fully Lamellar Microstructure Using Work Hardening Rate Characteristic and Processing Map Development

Document Type : Research Paper

Authors

Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute, P.O. Box: 14395-836, Tehran, Iran

Abstract

In this study, the hot deformation behavior of fully lamellar Ti-6Al-4V alloy was investigated through work hardening rate analysis and processing map development based on experimental hot compression data. Hot compression tests were performed over a temperature range of 700–1050 °C and strain rates from 0.001 to 1 s⁻¹. Work hardening rate curves were plotted against true stress and true strain using a numerical differentiation method. The results indicated that the work hardening rate increased during straining, reached a maximum, and subsequently decreased to zero due to the activation of dynamic softening mechanisms. The onset of dynamic recrystallization was identified by determining the critical stress from the work hardening rate–stress curve. Dynamic strain aging was detected as fluctuations in the work hardening rate–strain curve. A processing map at a strain of 0.8 was developed to characterize safe and unstable hot deformation domains. Furthermore, microstructural observations were employed to evaluate variations in power dissipation efficiency during hot deformation.

Keywords

References

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Iranian Journal of Materials Forming
Volume 13, Issue 1
January 2026
Pages 45-58

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