# Hot Deformation Behavior and Constitutive Equation of TA15N Titanium Alloy

## TL;DR

This study investigates the hot deformation behavior of TA15N titanium alloy to determine optimal processing conditions and develop reliable constitutive equations.

## Contribution

The paper presents new constitutive equations and a thermal processing map for TA15N titanium alloy based on experimental data.

## Key findings

- Flow stress of TA15N decreases with higher deformation temperatures and lower strain rates.
- Dynamic recovery replaces dynamic recrystallization as η decreases, observed via EBSD analysis.
- A reliable thermal processing interval for TA15N was established using the dynamic materials model.

## Abstract

In order to accurately obtain the deformation characteristics and suitable thermal deformation conditions of TA15N titanium alloy and guide the design of deformation process parameters, a Gleeble 1500D was used to conduct hot compression tests on the thermal deformation behavior of a deformed TA15N titanium alloy under the condition of a strain rate of 0.01–10 s−1 and a deformation temperature of 850–1090 °C. The constitutive equations for the deformed TA15N titanium alloy based on the Arrhenius formula were developed, and the reliability of the constitutive equations was verified. A thermal processing map of the deformed TA15N titanium alloy was established by using the dynamic materials model (DMM). The research results show that the flow stress of the TA15N alloy decreased with an increase in deformation temperature and a decrease in strain rate. By utilizing electron backscattered diffraction (EBSD), the microstructural evolution and deformation process were analyzed. As the value of η decreased, dynamic recovery (DRV) gradually replaced dynamic recrystallization (DRX). This study supplies a relatively reliable processing interval for the new TA15N titanium alloy.