Quick Search:       Advanced Search
戴勇,吕亚平,李少君,张晓泳,周科朝.针片Ti-5Al-5Mo-5V-3Cr-1Zr热加工过程中的球化动力学及有限元仿真[J].稀有金属材料与工程(英文),2019,48(4):1109~1115.[Yong Dai,Ya-ping Lv,Shao-jun Li,Xiao-yong Zhang and 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.]
Dynamic globularization kinetics and Finite Element Analysis for the Hot Working of Ti-5Al-5Mo-5V-3Cr-1Zr with Initial Lamellar Microstructure
Download Pdf  View/Add Comment  Download reader
Received:November 02, 2017  Revised:January 25, 2018
DOI:
Key words: Near β titanium alloy  Ti-55531  Hot deformation  Dynamic globularization kinetics model  Finite element method.
Foundation item:2015粉末冶金国家重点实验室自主课题,湖南省重点研发计划(2016JC2003)
Author NameAffiliation
Yong Dai,Ya-ping Lv,Shao-jun Li,Xiao-yong Zhang and Ke-chao Zhou  
Hits: 59
Download times: 53
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.