The weldability assessment of thermally hardened S540Q steel sheets

• Autorzy: Cicholska M.

Identyfikatory

DOI

10.5604/12314005.1130428

• Języki publikacji: EN

Abstrakty

EN

High strength thermally hardened steels are more difficult to weld than low carbon construction steels. There is a danger of cold cracking caused by the presence of martensite in welded joints. The thermally hardened 12 mm sheets of S540Q steel underwent research. The sheets were welded semi-automatically by MAG method, in the welding conditions usually applied in industry for welding normalized sheets of this steel. The welding technology was presented. The X-ray tests were performer, which confirmed the achievement of metallically continuous joints. Samples were taken from the joints and the joints hardness distribution measurements were conducted. The microstructure was examined and the static tensile tests as well as technological bend tests were carried out. Hardness measurements were performed in three measurement lines for each joint according to PN-EN 1043-1:2000 requirements. Joints microstructures were examined in the joints axis, in HAZ and in native materials. Steel microstructures were classified as low carbon tempered matrensite of layered construction. Mean values of the selected joints tensile strengths were also presented. The tensile tests values of native materials of metallurgic certificates were given for the sake of comparison. The research results presented in the paper made it possible to determine the weldability of S540Q steel.

Słowa kluczowe

EN

low-alloyed quality steels; heat treatment of S540Q steel; welded constructions

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2014
• Tom: Vol. 21, No. 4
• Strony: 43--48
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Cicholska M.

• Gdynia Maritime University, The Faculty of Marine Engineering Morska Street 83, 81-225 Gdynia tel.: [phone]

Bibliografia

• [1] Polski Rejestr Statków, Przepisy klasyfikacji i budowy statków morskich 1990, T. 7. Cz. IX, Zmiany Nr 1/2009, Gdańsk 2009.
• [2] Żaczek, Z., Cicholska, M., Rymkiewicz, S., Łabanowski, J., Zastosowanie na konstrukcje koparek stali ulepszonych cieplnie o Rg=500-690 MPa, Etap I, Praca badawcza BZ8500I8, Politechnika Gdańska, Gdańsk 1995.
• [3] Brózda, J., Spawalność stali o wysokiej wytrzymałości, Opracowanie Instytutu spawalnictwa w ramach SPUB, 2005.
• [4] Miller, Ch., The metallurgy & welding of high strength steels, Doc. TWI Nr WTC84hss, 2004.
• [5] Cicholska, M., Piaseczny, L., Ulepszenie wytrzymałości na zmęczenie przez obróbkę brzegów doczołowych złączy spawanych, Zeszyty Naukowe AMW, 1996.
• [6] Det norske Veritas, Rules for classification steel ships, Part 2, Chapter 3, Section 2, Welding procedurę and approwal of welders, Oslo 1990.
• [7] Basu, B., Microstructural variations in high-strength structural steel weld under isohead input conditions, Welding Journal, Nr 11, 2002.
• [8] Reumont, G. H., Die Schweisseingnung hochfester Feinkornbaustdhle - ihre Ermittlung und Bedeutung, DVS-Berichte, H. 22, 1971.
• [9] Cicholska, M., Influence of welding S620Q for hardnes distribution in their joints, Journal of KONES Warszawa 2012.