Modelling of flow stresses during hot deformation of Ti-6Al-4Mo-1V-0.1Si alloy

The present study describes the hot deformation behaviour of a novel Ti-6Al-4Mo-1V-0.1Si alloy. The flow characteristics of the alloy were investigated in the strain rate range of 0.01s(-1) to 10 s(-1) and at temperatures ranging from 800 to 1050 degrees C. The increase in deformation temperature and decrease in strain rate results in gradual decrease of flow stress. Flow softening was observed for deformation at lower temperatures (800-900 degrees C) due to lamellae kinking, whereas flat flow curve characteristics were observed for deformation at higher temperatures (950-1050 degrees C) due to a balance of dynamic recovery and recrystallization. The flow stress characteristics during hot deformation were predicted using constitutive modelling based on the Arrhenius hyperbolic sine equation. The strain rate sensitivity map was created for 0.69 strain. The optimum hot deformation zone was observed at 0.01s(-1) in the temperature range (925-1050 degrees C), and at strain rates of 1s(-1) and 5 s(-1) from 900 to 975 degrees C.

Automated summary

The present study investigates the hot deformation behavior of a new Ti-6Al-4Mo-1V-0.1Si alloy. Flow characteristics were studied at strain rates ranging from 0.01s(-1) to 10s(-1) and temperatures from 800 to 1050 degrees C. The flow stress decreases with increasing deformation temperature and decreasing strain rate. Flow softening occurs at lower temperatures (800-900 degrees C) due to lamellae kinking, while flat flow curve characteristics are observed at higher temperatures (950-1050 degrees C) due to a balance of dynamic recovery and recrystallization. Constitutive modeling based on the Arrhenius hyperbolic sine equation predicts the flow stress characteristics during hot deformation. The strain rate sensitivity map was created for 0.69 strain. The optimal hot deformation zone was observed at 0.01s(-1) in the temperature range of 925-1050 degrees C, and at strain rates of 1s(-1) and 5s(-1) from 900 to 975 degrees C.