The fatigue strength evaluation of S540Q steel and its welded joints

• Autorzy: Cicholska M.

Identyfikatory

DOI

10.5604/12314005.1130427

• Języki publikacji: EN

Abstrakty

EN

The research deals with the examination of thermally hardened sheets of weldable S540Q steel of high strength, obtained by thermo mechanical treatment. Conventional rolling and controlled rolling with rapid cooling processes were compared. Example of technological process of high strength sheets production was presented. The basic mechanical properties of this steel were determined (static tensile tests results as well as technological bend tests results were given). Then the steel sheets were welded by a semi-automatic MAG method. The research on the quality of welded joints was performed and their suitability for further research was worked out. Mechanical properties of S540Q steel welded joints were elaborated. The mechanical properties of native material were compared to the properties of welded joints. Joints microstructure was examined in the joints axis, in heat-affected zone and in native material. Fatigue tests were conducted in the non-symmetric tension - compression cycle for the welded joints. The computational fatigue strength was determined and then compared to fatigue strength of the welded joints. The tests results were elaborated statistically by the analysis of linear regression. Wöhler charts were made after conducting fatigue tests. The analysis of increasing the fatigue strength of S540Q steel welded joints was also performed.

Słowa kluczowe

EN

weldability; fatigue strength; weldable steels of high strength

• 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: 37--42
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Cicholska M.

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

Bibliografia

• [1] Besu, B., Micro structural variations in high-strength structural steel weld under isohead input conditions, Welding Journal, Nr 11, 2002.
• [2] Brózda, J., Spawalność stali o wysokiej wytrzymałości, Opracowanie Instytutu Spawalnictwa w ramach SPUB, 2005.
• [3] Cicholska, M., Czechowski, M., Materiałoznastwo okrętowe, Skrypt AM w Gdyni, 2012.
• [4] Cicholska, M., Analiza przydatności ulepszanych cieplnie stali 15G2ANb, 18G2AV-1 i 14HNMBCu na konstrukcje koparek, Rozprawa doktorska, Politechnika Gdańska, Gdańsk 1994.
• [5] Cudny, K., Bugłacki, H., Krzysztofowicz, T., Puchaczewski, N., Metaloznawstwo Okrętowe, WPG, Gdańsk 2002.
• [6] Det norske Veritas, Rules for ship steel classiflcation, Part 2, Chapter 3, Section 2, Welding procedure and aprowal of welders, Oslo 2010.
• [7] Polski Rejestr Statków, Przepisy klasyfikacji i budowy statków morskich 1990, T. 7, Cz. IX,Zmiany Nr 1/2009, Gdańsk 2009.
• [8] TMCP steelplates for building structures, Nippon Steel Corporation.