- By:
- Kopparthi, Ravikiran; Li, Leijun; Lehnhoff, Greg; Sharma, Nitin; Kannan, Rangasayee ; Saini, Nitin; Dev choudhury, Suvan; Lyu, Zhe
- Journal Name:
- Materials Chemistry and Physics
- Page Number:
- 127758
- Volume:
- 302
- Issue Number:
- N/A
- Publication Date:
- April 19, 2023
- View DOI Listing:
- https://doi.org/10.1016/j.matchemphys.2023.127758
Abstract
Microstructure and crystallographic texture and their correlation with impact toughness of high-frequency electric resistance welded (HF-ERW) X65 Grade pipeline steel have been investigated. X65 base metal after HF-ERW has formed a typical hourglass-shaped weld joint with four different regions, including the thermomechanical-affected zone (TMAZ), fine-grained heat affected zone (FGHAZ), coarse-grained heat affected zone (CGHAZ), and bondline (Weld Zone). X65 base metal shows prominent (113) [110] and (112) [110] texture components due to thermomechanical-controlled processing. TMAZ depicted random texture with a minor intensity of Cube component (001)[110] due to the partial recrystallization during welding. In the FGHAZ and CGHAZ, near the bondline, the base metal texture has been converted to rotated Goss (110) [110], Goss (110) [001], and rotated cube (001) [110] due to the recrystallization of the austenite and the shear deformation in the austenite temperature range. A high density of {100} and {110} cleavage planes is observed in the CGHAZ, which is often found to be the fracture location for the impact toughness testing.
