- Tytuł:
- 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 - Powiązania:
- https://bibliotekanauki.pl/articles/1573781.pdf
- Data publikacji:
- 2020
- Wydawca:
- Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
- Tematy:
-
underwater dry welding
high strength low alloy steel
water depth
microstructural evolution
mechanical property - Opis:
- 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.
- Źródło:
-
Polish Maritime Research; 2020, 4; 112-119
1233-2585 - Pojawia się w:
- Polish Maritime Research
- Dostawca treści:
- Biblioteka Nauki
Artykuł