EFFECT OF TEMPERATURE-STRAIN PARAMETERS ON THE STRUCTURE AND MECHANICAL PROPERTIES OF NB, V, NI - ALLOYED STEELS IN TERMS OF HIGH TEMPERATURE THERMOMECHANICAL PROCESSING

1 RUDSKOI Andrei
Co-authors:
1 KODZHASPIROV Georgii 2 KLIBER Jiri
Institutions:
1 Peter the Great St. Petersburg Polytechnic University, 195251, St. Petersburg, Russia, gkodzhaspirov@gmail.com
2 VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
314-319
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
68 views / 21 downloads
Abstract

The effect of rolling temperature (800-1000°C) - strain accumulation (number of rolling passes: 3÷5) - cooling rate (8.6 – 250C/s) parameters at the High Temperature Thermomechanical Processing (HTMP) on the microstructure, mechanical properties at the room and low temperatures of C-Ni-Nb and C-Ni-V steels intended for the usage as a high- strength material for production of the shelf constructions, strips and other special welded products has been studied. Experiment planning method (EPM) has been used to study the effect of the mentioned above parameters on the mechanical properties. By results of experiments the regression equations described the qualitative and quantitative effect of HTMP parameters on the mechanical properties of steel are constructed. The analysis of microstructure and SEM analysis of the fracture at +200C and -400C temperatures has been carried out. It was shown that the highest strength (YS = 987 MPa) in combination with a high impact strength (W = 154 J) has a Ni-Nb-bearing steel with lower bainite structure formed result in maximum passes and highest deformation temperature and cooling rate realization. The best cold resistance has steel with low bainite structure transformed at the accelerate cooling from the fine fragmented hot deformed austenite.

Keywords: Mechanical properties, HSLA steels, rolling, microstructure, fracture
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