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Integrated model for thermo-mechanical controlled process in rod (or bar) rolling

journal contribution
posted on 2002-09-09, 00:00 authored by Y Lee, S Choi, Peter HodgsonPeter Hodgson
This study presents an integrated model for computing the thermo-mechanical parameters (cross-sectional shape of workpiece, the pass-by-pass strain and strain rate and the temperature variation during rolling and cooling between inter-stands) and metallurgical parameters (recrystallisation behaviour and austenite grain size—AGS), to assess the potential for developing “Thermo-Mechanical Controlled Process” technology in rod (or bar) rolling, which has been a well-known technical terminology in strip (or plate) rolling since 1970s.

The advantage of this model is that metallurgical and mechanical parameters are obtained simultaneously in a short computation time compared with other models. The model has been applied to a rod mill to predict the exit cross-sectional shape, area and AGS per pass by incorporating the equations for AGS evolution being used in strip rolling. At the finishing train of rod mills, the strain rates reach as high as 1000–3000 s−1 and the inter-pass times are around 10–60 ms.

The results show that the proposed model is an efficient tool for evaluating the effects of process-related parameters on product quality and dimensional tolerance of the products in rod (or bar) rolling. The results of the simulation demonstrated that the equation for AGS evolution being used in strip rolling might have limitations when applied directly to rod rolling at a high strain rate.


History

Journal

Journal of materials processing technology

Volume

125

Issue

126

Pagination

678 - 688

Publisher

Elsevier Science B.V.

Location

Amsterdam, The Netherlands

ISSN

0924-0136

eISSN

1873-4774

Language

eng

Notes

Available online 12 June 2002.

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2002, Elsevier Science B.V.