About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2026 - In-Situ Characterization Techniques
|
| Presentation Title |
Investigation of Fracture Toughness in Repair Weld of Process Piping Using Electron Backscatter Diffraction and Atomic-Scale Modelling |
| Author(s) |
Gil Mabini Agag, Persia Ada de Yro, Clodualdo Aranas |
| On-Site Speaker (Planned) |
Persia Ada de Yro |
| Abstract Scope |
Weld repair is a critical issue in low-carbon steel piping due to the equipment’s importance in the energy and chemical processing sectors. This research evaluates both repair and original welds through empirical welding experiments. After welding, destructive tests are conducted, including microhardness, tensile, Charpy, and crack tip opening displacement at -29 °C. The assessment of repair welds is further supported by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and atomic-scale simulation and modelling using analytical techniques. The welding experiments are performed on A106 Grade B low-carbon steel piping with an 18-inch diameter. EBSD provides nanoscale information on phase fractions, crystal structures, and lattice parameters. Analytical modelling calculates the energy-volume derivative (d²E/dV²) to determine bulk modulus and fracture toughness, yielding values of 216 GPa and 130 MPa√m, respectively. These welds surpass industry standards, enhancing asset performance and extending equipment lifespan. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, Modeling and Simulation |