Microstructure evolution and mechanical properties of underwater dry welded metal of high strength steel Q690E under different water depths

• Autorzy: Sun Kun , Huc Yu , Shi Yonghua , Liao Baoyi

Identyfikatory

DOI

10.2478/pomr-2020-0071

• Języki publikacji: EN

Abstrakty

EN

Q690E high strength low alloy (HSLA) steel has been intensively applied in maritime engineering. Also, the underwater dry welding (UDW) technique has been widely used to repair important offshore facilities. In this paper, joints of Q690E steel were fabricated through single-pass underwater dry welding at three pressures (0, 0.2, and 0.4 MPa). To study the effect of the pressure on the microstructure and mechanical properties of the UDW joint, an optical microscope (OM) and scanning electron microscope (SEM) were used to observe the microstructure and fracture morphology of the welded joints. The electron backscattered diffraction (EBSD) technique was used to analyse the crystallographic features and the crystallographic grain size of the ferrites. The proportion of acicular ferrite (AF) in the UDW joints and the density of low-angle boundaries increase dramatically with the increasing depth of water. The weld metal of UDW-40 shows higher strength because more fine ferrites and low-angle boundaries within UDW-40 impede the dislocation movement.

Słowa kluczowe

EN

underwater dry welding; high strength low alloy steel; water depth; microstructural evolution; mechanical property

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2020
• Tom: nr 4
• Strony: 112--119
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Sun Kun

• School of Mechanical and Automotive Engineering South China University of Technology, Guangzhou 510640, China
• Guangdong Provincial Engineering Research Center for Special Welding Technology and Equipment South China University of Technology, Guangzhou 510640, China

autor

Huc Yu

• School of Mechatronic Engineering and Automation, Foshan University, Foshan 528000, China

autor

Shi Yonghua

• School of Mechanical and Automotive Engineering South China University of Technology, Guangzhou 510640, China
• Guangdong Provincial Engineering Research Center for Special Welding Technology and Equipment South China University of Technology, Guangzhou 510640, China

autor

Liao Baoyi

• School of Mechanical and Automotive Engineering South China University of Technology, Guangzhou 510640, China
• Guangdong Provincial Engineering Research Center for Special Welding Technology and Equipment South China University of Technology, Guangzhou 510640, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).