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In the frame of this project the influence of high strain rates on the deformation behaviour and the micro-structural evolution in the austenitic region has been investigated. The main focus was aimed at relatively high strain rates by using the different facilities of the project partners. Five steel grades have been included: two IF steel with Ti and TiB additions, a low carbon steel (LC) and two carbon steels (P355 and S355). In a round robin test the comparability of data from different machines has been proven on the steel grade S355.

All experimental data have been analysed with the dislocation model after Bergström. The model parameters have been determined via a least square fit. The residual variance is in the range of 1MPa, i.e. ~1%. The model parameters have been evaluated by a multiple regression analysis concerning the strain rate and temperature dependency. Finally, calculated stress-strain curves have been compared with experimental ones over a large range of strain rates. It turns out that the Bergström model is suitable to describe the flow curves over the strain rate interval from 0.1 (IF-Ti 0.001) up to 500/s.

Additionally the influence of temperature and strain rate on static softening and the alpha-gamma transformation has been investigated. Higher strain rates generally accelerate the microstructure evolution, but the effect of temperature and cooling rate are more pronounced.

This is a corrected version of the report first published as ISBN: 92-894-5151-3; Catalogue No. KI-NA-20581-EN-S.

Additional information

Authors: SELLGER R, TKS, Duidburg (DE);JUNGNICKEL W, BAF, Freiberg (DE);COLIJN J, Corus, IJmuiden (NL);DAMIEN F, IRSID, Maizières-lès-Metz (FR);HERZIG C, RWTH, Aachen (DE)
Bibliographic Reference: EUR 20581 EN (2003), 81 pp. Euro: 15.00
Availability: EUR-OP reference: KI-NA-20581-EN-R Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-5615-9
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