THE INFLUENCE OF NIOBIUM CONTENT ON HOT FLOW STRESS OF HSLA STEELS

1 OPĚLA Petr
Co-authors:
1 HOFER Roman 1 SCHINDLER Ivo 1 KAWULOK Petr 2 HRUŠKA Miroslav 1 KAWULOK Rostislav 1 RUSZ Stanislav
Institutions:
1 VSB - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Czech Republic, EU, petr.opela@vsb.cz, roman.hofer.st@vsb.cz, ivo.schindler@vsb.cz, petr.kawulok@vsb.cz, rostislav.kawulok@vsb.cz, stanislav.rusz2@vsb.cz
2 Z-Group Steel Holding, a.s., Chomutov, Czech Republic, EU, Hruska.Miroslav@steel-holding.cz
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
383-388
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
175 views / 54 downloads
Abstract

Uniaxial hot compression tests performed on a HDS-20 Hot Deformation Simulator were utilized to compare the influence of niobium amount on hot flow stresses of these steels. For both steels, the temperature range from 700 °C to 1200 °C in combination with the nominal strain rate range from 0.1 s-1 to 100 s-1 were investigated. A unique computing method was employed to correct the shape of the experimentally obtained hot flow stress curves influenced by the barrel-like shape of the test samples at high strains. Decrease in temperature led to an increase in hot flow stress. The same influence had an increase in strain rate. The hot flow stress of the steel S355J2H is almost at each temperature higher when compared to the steel P355NH. Nevertheless, different flow stress behavior was observed at small strain rates.

Keywords: HSLA steel, uniaxial hot compression test, flow stress curves, peak stress

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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