Original scientific paper

Hot flow stress models of the steel C45

P. Opěla ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
I. Schindler ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
P. Kawulok ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
F. Vančura ; Kovárna VIVA SpA, Czech Republic
R. Kawulok ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
S. Rusz ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic
T. Petrek ; VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic

Abstract

Flows stress of the steel C45 were predicted on the basis of experimentally obtained flow stress curves, using uniaxial hot compression tests on the plastometer HDS-20, by two completely different types of mathematical models, moreover with comparison to a model comprised in the FEM database of the FORGE software. The tests were carried out within the temperature range from 900 to 1 280 °C, at the strain rate from 0,1 to 100 s-1 and deformations up to 1,0. It follows from the results of flow stress prediction that models designed on the basis of experimental measurements have much better information capability than the generated model implemented into the database of the FORGE software, however, their extrapolation for larger deformations is limited.

Keywords

medium-carbon steel; uniaxial hot compression test; flow stress curves; hot flow stress model

Hrčak ID:

131599

URI

https://hrcak.srce.hr/131599

Publication date:

1.7.2015.

Visits: 2.672 *