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Dynamic globularization kinetics and Finite Element Analysis for the Hot Working of Ti-5Al-5Mo-5V-3Cr-1Zr with Initial Lamellar Microstructure
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1.State Key Laboratory of Powder Metallurgy,Central South University;2.China

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2015 independent project of State Key Laboratory of Powder Metallurgy,Key research and development plan of Hunan province (2016JC2003).

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    Abstract:

    Characteristic of α phase is an important factor affecting the mechanical properties of titanium alloys. To predict the microstructure evolution of the Ti-55531 (Ti-5Al-5Mo-5V-3Cr-1Zr) with initial lamellar α, the dynamic globularization kinetics model of Ti-55531 during hot deformation was characterized by Avrami equation. A series of thermal simulation experiments were conducted to obtain the curves of stress σ versus strain ε to determine the equation parameters. By further transforming the stress σ-strain ε curves into strain hardening rate dσ/dε-ε curve, the critical strain εc (corresponding to the minimum value of dσ/dε) and the peak strain εp (the strain at dσ/dε = 0) be obtained. The dynamic globularized fraction fg at different deformation conditions was also measured. Sequentially, the parameters in the Avrami equation were determined from the linear fitting of the relationships among strain rate, temperature, and dynamic globularized fraction. The as-obtained Avrami equation was expressed as fg =1-exp[-0.5783((ε-εc)/εc)0.907], where εc =0.6053εp and εp =1.249×10-4?0.0807exp(58580/RT). Finally, the as-obtained dynamic globularization kinetic model was implanted into finite element program to simulate dynamic globularization kinetics. By combining the dynamic globularization kinetics model with the finite element method, the dynamic globularization of the lamellar α was predicted effectively.

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[Yong Dai, Ya-ping Lv, Shao-jun Li, Xiao-yong Zhang, Ke-chao Zhou. Dynamic globularization kinetics and Finite Element Analysis for the Hot Working of Ti-5Al-5Mo-5V-3Cr-1Zr with Initial Lamellar Microstructure[J]. Rare Metal Materials and Engineering,2019,48(4):1109~1115.]
DOI:10.12442/j. issn.1002-185X.20170991

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History
  • Received:November 02,2017
  • Revised:January 25,2018
  • Adopted:February 09,2018
  • Online: May 13,2019
  • Published: