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Application of identification techniques to determine effect of carbon content in steels on rheological parameters during hot deformation

conference contribution
posted on 2004-01-01, 00:00 authored by L Madej, Peter HodgsonPeter Hodgson, M Pietrzyk
The objective of the present work is searching for the correlation between the carbon content in steels and the parameters of the rheological models, which are used to describe the materials behavior during hot plastic deformation. This correlation can be expected in the internal variable models, which are based on physical phenomena occurring in the material. Such a model, based on the dislocation density as the internal variable, is investigated in this work. The experiments including hot torsion tests are used for the analysis.
The procedure is composed of three parts. Plastometric tests were performed for steels with various carbon content. Optimization techniques were applied next to determine the coefficients in the internal variable rheological model for these steels. Two versions of the model are considered. One is based on the average dislocation density and the second accounts for the distribution of dislocation densities. Evaluation of correlation between carbon content and such coefficients in the models as activation energy for self diffusion, activation energy for recrystallization, grain boundary mobility, recovery coefficient etc. was the main objective of the work. In consequence, the model which may be used for simulation of hot forming processes for steels with various chemical compositions, is proposed.

History

Event

International Conference on Numerical Methods in Industrial Forming Processes (8th : 2004 : Columbus, Ohio)

Pagination

554 - 559

Publisher

American Institute of Physics

Location

Columbus, Ohio

Place of publication

Melville, N.Y.

Start date

2004-06-13

End date

2004-06-17

ISBN-13

9780735401884

ISBN-10

0735401888

Language

eng

Publication classification

E2 Full written paper - non-refereed / Abstract reviewed

Copyright notice

2004, American Institute of Physics

Editor/Contributor(s)

S Ghosh, J Castro, J Lee

Title of proceedings

NUMIFORM 2004 : Proceedings of the 8th International Conference on Numerical Methods in Industrial Forming Processes : Materials Processing and Design : Modelling, Simulation and Applications

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