INFLUENCE OF CHROMIUM CONTENT ON THE MECHANICAL PROPERTIES AND HAZ SIMULATIONS OF LOW-CARBON BAINITIC STEELS

1 NYO Tun Tun
Co-authors:
1 KAIJALAINEN Antti 1 HANNULA Jaakko 1 SOMANI Mahesh 1 KÖMI Jukka
Institution:
1 Materials and Mechanical Engineering, CASR, University of Oulu, Finland, EU, tun.nyo@oulu.fi
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:
520-525
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:
27 views / 11 downloads
Abstract

During thermomechanically controlled processing (TMCP) of carbon steels, controlled rolling in no-recrystallization regime followed by directing quenching results in excellent mechanical properties, besides enabling cost-saving in respect of energy costs normally incurred during reheating and quenching procedure. The effects of three different combinations of Cr with 0.06 wt.% of Nb on the microstructures and mechanical properties of thermomechanically rolled and direct-quenched low-carbon (0.035 wt.%) microalloyed steel plates have been investigated to obtain balanced mechanical properties. Laboratory-scale ingots were cast, hot rolled and direct quenched into 12 mm thick plates as per an experimental plan. Tensile properties, impact toughness, hardness and hardenability were studied. In addition, coarse grained heat affected zone (CGHAZ) simulations were performed in a Gleeble simulator to evaluate the weldability of the investigated steels using cooling time from 800 °C to 500 °C (t8/5) of 5 s and 15 s.

Keywords: CGHAZ, direct quenching, lower bainite, upper bainite
Scroll to Top