INFLUENCING OF TRANSFORMATION KINETIC OF 25CRMO4 STEEL BY THE THERMOMECHANICAL PARAMETERS

1 KAWULOK Rostislav
Co-authors:
1 KAWULOK Petr 1 SCHINDLER Ivo 1 PLEVÁK Dan 1 KIŠAC Ladislav 2 TUROŇ Rostislav 1 OPĚLA Petr
Institutions:
1 VSB - Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, 17 listopadu 15, 708 33 Ostrava - Poruba, Czech Republic, EU, rostislav.kawulok@vsb.cz, petr.kawulok@vsb.cz, ivo.schindler@vsb.cz, dan.plevak.st@vsb.cz, ladislav.kisac.st@vsb.cz, petr.opela@vsb.cz
2 Třinecké železárny, a.s., Průmyslová 1000, 739 70 Třinec – Staré Město, Czech Republic, EU, rostislav.turon@trz.cz
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
236-241
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
48 views / 10 downloads
Abstract

The aim of the contribution is creation of transformation diagrams of hypoeutectoid 25CrMo4 steel that is used for tube production for the OCTG (Oil Country Tubular Goods) industry. For a comparison purpose, the CCT diagrams with and even without influence of previous deformation were assembled. In addition, the DCCT diagram (i.e. with previous deformation influence) was exposed to different austenitization conditions. The transformation diagrams were assembled on the basis of dilatometric tests which were confronted with the metallographic analysis and hardness measurement. Due to the influence of previous deformation and different austenitization conditions, peremptory movements of curves in the assembled transformation diagrams were occurred, which, of course, was reflected also on the structure and hardness, respectively. After the previous deformation, the structures of samples had considerably increased share of quenching phases, including of share of acicular ferrite. This, of course, was manifested by increased values of hardness.

Keywords: Transformation diagrams, dilatometric tests, microstructure, deformation
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