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This work has concentrated on acquiring information on the response of the two-phase structure to deformation in the intercritical temperature range. Each partner concentrated on a specific set of steels. The main steels investigated were: CMn and CMnNb strip steels, CMn and CMnNb plate steels, and a dual phase steel. Some data were also used from ULC, IF, ELC and LC steels.

Models of flow curves, softening and transformation were derived and used by the project partners. This involved different modelling techniques being used, including mathematical fitting of curves to the data, metallurgical modelling and FE. The assumption that use of the law of mixtures was valid for phase contributions to flow curves was assumed by some of the partners, but shown possibly not to be true, at low factions of austenite, by others.

This project was one of the first to investigate the hot flow behaviour in steels at intercritical temperatures. Thus a lot of the results lead to more questions and suggestions for future work, rather than answers. For universally applicable models, more accurate data need to be obtained for a wider range of compositions and grains sizes. If accurate data (especially temperature) were available from commercial rolling mills, this would be a valuable source of information.

Additional information

Authors: WHITTAKER N A, CORUS UK Limited, Rotherham (GB);BODIN A, CORUS NL BV, Ljmuiden (NL);HERZIG C, RWTH-IEHK, Aachen (DE);GROSSTERLINDEN R, Thyssen-Krupp Stahl, Duisburg (DE)
Bibliographic Reference: EUR 20879 EN (2003), 188pp. Euro: 25
Availability: EUR-OP reference: KI-NA-20879-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-6254-X
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