The modelling of ring tests at elevated temperatures for the determination of friction in Ti-6Al-4V forgings

James D. Pollard¹, Andrew Watford², Martin Jackson³, Bradley P. Wynne³

¹EPSRC Centre for Doctoral Training in Advanced Metallic Systems, Dept. of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK..
²RTI Extrusions Europe, Ltd., Brighouse Road,Low Moor,Bradford,BD120QL, UK..
³Dept. of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, UK.

DOI:

https://doi.org/10.7494/cmms.2015.1.0515

Abstract:

Ring compression tests and finite element modelling were used to explore the friction conditions present in high temperature Ti-6Al-4V forgings where glass is used as the lubricant. The work explored the use of isothermal and nonisothermal simulations as a means of modelling non-isothermal test conditions. The friction factor is determined by comparison of the deformation of the internal diameter of the experimental compression rings and the simulated compression rings. It was determined that the heat transfer coefficients (HTCs) used in the simulations have a significant result on the friction factor predicted by the simulation results. It was found that it is possible to predict similar deformations through combinations of low HTC/high friction factor and high HTC/low friction factor. Consequently, it is considered critical that the heat transfer conditions for non-isothermal work where there is a high temperature gradient between workpiece and its surroundings be correctly modelled in order to determine the correct friction factor to be used in later simulations.

Cite as:

Pollard, J., Watford, A., Jackson, M., & Wynne, B. (2015). The modelling of ring tests at elevated temperatures for the determination of friction in Ti-6Al-4V forgings. Computer Methods in Materials Science, 15(1), 150-155. https://doi.org/10.7494/cmms.2015.1.0515

Article (PDF):

Keywords:

Ti-6Al-4V, Friction, Heat transfer, Ginite element modelling, Thermomechanical processing

References: