About this Abstract |
| Meeting |
2025 AWS Professional Program
|
| Symposium
|
2025 AWS Professional Program
|
| Presentation Title |
Effect of Squeeze Deformation on Microstructure, Crystallographic Texture, and Impact Toughness of the Electric Resistance Welded X65 Line Pipe |
| Author(s) |
Ravikiran Kopparthi, Greg Lehnhoff, Leijun Li |
| On-Site Speaker (Planned) |
Ravikiran Kopparthi |
| Abstract Scope |
Electric resistance welding (ERW) is widely used to manufacture longitudinal seam-welded steel line pipes for transporting oil and natural gas. In ERW, high-frequency alternating current heats the steel strip edges, which are then compressed (squeeze deformation) to form a solid-state bondline. The complex thermomechanical processes in ERW can significantly alter the microstructure of the base metal, often leading to degraded mechanical properties. This study investigates the effect of squeeze deformation, via physical simulation, on the microstructure, crystallographic texture, and Charpy V-notch impact toughness of ERW X65 line pipe. The X65 base metal exhibits fine-grained polygonal ferrite, Nb-rich and Ti-rich precipitates, and prominent (113)[110] and (112)[110] texture components. Increased squeeze deformation reduces grain size but intensifies the Goss texture components (110)[110] and (110)[001] due to austenite recrystallization and shear deformation. A strong correlation was found between the experimental results and industrially manufactured ERW samples. Notably, the persistent presence of Goss texture in the coarse-grained heat-affected zone (CGHAZ) was a key factor in reducing the impact toughness of ERW line pipes. |
| Proceedings Inclusion? |
Undecided |