MICROSTRUCTURAL PARAMETERS AND MECHANICAL PROPERTIES OF THE THERMALLY SIMULATED HAZ SAMPLES OF T24 STEEL

1 SZTEFEK Radek
Co-authors:
2 VODÁREK Vlastimil 2 SCHWARZ Drahomír 2 JAROLÍMOVÁ Mária
Institutions:
1 Vítkovice Heavy Machinery a.s., Ostrava, Czech Republic, EU, radek.sztefek@vitkovice.cz
2 VŠB – Technical University of Ostrava, Ostrava, Czech Republic, EU, vlastimil.vodarek@vsb.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:
904-909
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:
147 views / 39 downloads
Abstract

The paper is dealing with microstructural characterisation and mechanical properties of thermally simulated parts of the heat affected zone in homogeneous weldments of T24 steel. The study has been targeted on the blunt peripheral weld joints of T24 steel between two tubes, which are an integral part of the production of membrane walls. Investigations on thermally simulated HAZ samples were performed in two states: after simulation (as-welded) and after PWHT 740 °C / 1 h. Thermal cycles for simulation of basic parts of HAZ in homogeneous welds of T24 steel were obtained by real measurements with subsequent corrections based on numerical simulations of welding using the Sysweld software. Thermal simulations were carried out on samples of Vallourec & Mannesmann tubes using a simulator TCS 1405. On the thermally simulated samples hardness and impact energy were evaluated. Microstructural characterisation was carried out using both light microscopy and transmission electron microscopy. Extraction replicas were used for identification of minor phases. Results of thermal simulations were validated on a real weldment. Results on simulated samples reasonably complied with results obtained on the real homogeneous weldment of T24 steel.

Keywords: weld joint, T24 steel, HAZ, thermal cycle, thermal simulation, precipitation

© 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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