1. Modeling and Finite Element Analysis for the Dynamic Recrystallization Behavior of Ti-5Al-5Mo-5V-3Cr-1Zr Near β Titanium Alloy During Hot Deformation.
- Author
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Lv, Ya-ping, Li, Shao-jun, Zhang, Xiao-yong, Li, Zhi-you, and Zhou, Ke-chao
- Subjects
DEFORMATIONS (Mechanics) ,MICROSTRUCTURE ,STRAIN rate ,RECRYSTALLIZATION (Metallurgy) ,TITANIUM alloys - Abstract
Evolution for the dynamic recrystallization (DRX) volume fraction of Ti-5Al-5Mo-5V-3Cr-1Zr near β titanium alloy during hot deformation was characterized by using the Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation. To determine the equation parameters, a series of thermal simulation experiments at the temperature of 1023–1098 K and strain rate of 0.001–1 s
‒1 to the true strain of 0.7 were conducted to obtain the essential data about stressσ and strainε . By further transforming the relationship ofσ versusε into the relationship of strain hardening rate dσ /dε versusσ , two characteristic strains at the beginning of DRX (critical strainε ) and at the peak stress (peak strainc ε ) were identified from the dp σ /dε-σ curves. Sequentially, the parameters in the JMAK equation were determined from the linear fitting of the different relationships among critical strainε , peak strainc ε and deformation conditions (including temperaturep T , strain rate ε ˙ $\dot \varepsilon $ and strainε ). The as-obtained JMAK equation was expressed asX =1-exp[-0.0053((DRX ε-ε )/c ε )c 2.1 ], whereε =0.6053c ε andp ε =0.0031 ε ˙ $\dot \varepsilon $p 0.0081 exp(28,781/RT ). Finally, the JMAK equation was implanted into finite element program to simulate the hot compression of thermal simulation experiments. The simulation predictions and experimental results about the DRX volume fraction distribution showed a good consistency. [ABSTRACT FROM AUTHOR]- Published
- 2018
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