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Strain-induced precipitation behaviour in hot rolled strip steel

journal contribution
posted on 2001-02-15, 00:00 authored by E V Pereloma, B R Crawford, Peter HodgsonPeter Hodgson
The strain-induced precipitation of Nb(C, N) into the austenite in a Nb-microalloyed steel was investigated both experimentally and using a predictive model. The precipitation of Nb(C, N) was measured indirectly from the hardness at room temperature after thermomechanical treatment. The predictive model combined the precipitation start model of Dutta and Sellars with the Avrami equation and the additivity principle to allow prediction of the volume fraction of Nb(C, N) precipitated. The effects of several thermomechanical schedules were studied. These were (i) the effect of isothermal hold temperature and duration; (ii) the effect of deformation temperature at high and low cooling rates; (iii) the effect of cooling rate prior to the austenite to ferrite transformation; and (iv) the effect of multiple pancaking deformations. The fit between the experimental data and calculated results was found to be good in all cases with the exception of the slow cooling rate results of schedule (ii). It was concluded that the model could, once calibrated, successfully predict the hardness and strength of thermomechanically processed Nb-microalloyed steels.

History

Journal

Materials science and engineering: A

Volume

299

Issue

1-2

Pagination

27 - 37

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0921-5093

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2001, Elsevier Science