The influence of treating welded joints edges on the strength and fatigue of S640Q steel

• Autorzy: Cicholska M.

Identyfikatory

DOI

10.5604/01.3001.0010.2900

• Języki publikacji: EN

Abstrakty

EN

Weldable steels of high strength were discussed. The factors influencing the achievement of low grain structure that ensures high strength of these steels was explained. Traditional and modern methods of producing high strength steel were shown. The scheme of production line was shown, the line which is used to manufacture steel of high strength in thermomechanical way. The methods of achieving strength to fatigue used for welded joints were presented. The factors influencing the increase of strength to fatigue of welded joints were elaborated. The thermally hardened steel sheets of high strength weldable S640Q steel underwent research. Basic mechanical properties of this steel were indicated. The results of static tensile test and technological bend test were given. Then the sheets were welded by semiautomatic MAG method. The examinations of welds quality were conducted and their usefulness for further tests was stated. Mechanical properties of welded joints were determined. The mechanical properties of native material and welded joints were compared. The microstructure of welded joints in the weld axis, in heat influence zone as well as in native material was examined. Fatigue tests in a non-symmetrical cycle of lengthening – compressing for the welded joints were carried out. The computational strength to fatigue was determined and compared with fatigue strength of welded joints. Tests results were elaborated by the statistical analysis of linear regression. After conducting fatigue tests, the Wöhler diagrams were made. Afterwards, the joints welded with TIG method, were penetrated without adding filler metal. The results were presented for the fatigue tests as well as the Wohler graph for welded joints after penetration of the joints edges with TIG method without adding filler metal. The results were compared.

Słowa kluczowe

EN

weldability; high strength weldable steel; thermomechanical treatment; increasing fatigue strength; fatigue 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: 2017
• Tom: Vol. 24, No. 2
• Strony: 59--64
• Opis fizyczny: Bibliogr. 12 poz., rys.

Twórcy

autor

Cicholska M.

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

Bibliografia

• [1] Besu, B., Microstructural variations in high-strengh structural steel weld under isohead input conditions, Welding Journal, No. 11, 2002.
• [2] Brózda, J., Spawalność stali o wysokiej wytrzymałości, Opracowanie Instytutu Spawalnictwa w ramach SPUB, 2005.
• [3] Cicholska, M., Czechowski, M., Materiałoznawstwo 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 clasification steel ship, Part 2, Chepter 3, Section 2, Welding procedure and approval of welders, Oslo 2010.
• [7] Górka, J., Spawalność stali obrabianej termomechanicznie o wysokiej granicy plastyczności, Biuletyn Instytutu Spawalnictwa, 5/2010.
• [8] Holzner, A., Spawanie wysokowytrzymałych drobnoziarnistych stali konstrukcyjnych metodą MAG drutami proszkowymi, Biuletyn Instytutu Spawalnictwa, 4/2011.
• [9] Pilarczyk, J., Zeman, W., Spawalnictwo dziś i jutro, Biuletyn Instytutu Spawalnictwa, 5/2012.
• [10] Polski Rejestr Statków. Przepisy klasyfikacji I budowy statków morskich 1990, T. 7, Cz. IX, Zmiany nr 1/2009, Gdańsk 2009.
• [11] Węglowski, M., Nowoczesne stale ulepszane cieplnie – własności i korzyści z ich zastosowania, Biuletyn Instytutu Spawalnictwa, 4/2012.
• [12] Zeman, M., Sitko, E., Przegląd stali wysokiej i bardzo wysokiej wytrzymałości, Biuletyn Instytutu Spawalnictwa, 3/2007.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).