High Temperature Flow Response Modeling of Ultra-Fine Grained Titanium

Metals

Seyed Vahid Sajadifar²  Guney Guven Yapici¹ 

[1] Mechanical Engineering Department, Ozyegin University, Istanbul 34794, Turkey; E-Mail

关键词: severe plastic deformation;    titanium;    equal channel angular extrusion/pressing;    high temperature;    ultra-fine grained;    Johnson-Cook model;   

DOI  :  10.3390/met5031315

来源: mdpi

【 摘 要 】

This work presents the mechanical behavior modeling of commercial purity titanium subjected to severe plastic deformation (SPD) during post-SPD compression, at temperatures of 600-900 °C and at strain rates of 0.001-0.1 s⁻¹. The flow response of the ultra-fine grained microstructure is modeled using the modified Johnson-Cook model as a predictive tool, aiding high temperature forming applications. It was seen that the model was satisfactory at all deformation conditions except for the deformation temperature of 600 °C. In order to improve the predictive capability, the model was extended with a corrective term for predictions at temperatures below 700 °C. The accuracy of the model was displayed with reasonable agreement, resulting in error levels of less than 5% at all deformation temperatures.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.