| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Computational Process-microstructure-impact Toughness Optimization for Fe-10Ni Groove Welds |
| Author(s) |
Salman Matan, Boian Alexandrov, Daniel Bechetti |
| On-Site Speaker (Planned) |
Salman Matan |
| Abstract Scope |
U.S. Navy researchers recently developed a solid wire consumable based on the Fe-10Ni alloy system. The weld metal has demonstrated acceptable mechanical properties for the GTAW and GMAW processes. However, the toughness of the GTA weld metal was significantly higher than seen in the GMA weld metal. This work aims to reduce the toughness variability in Fe-10Ni groove welds produced with the GMAW process. The effect the different regions of the GMAW multi-pass welds have on impact toughness will be investigated. The weld metal impact toughness will be optimized using an ICME approach. This will involve accurately modeling the GMAW Fe-10Ni groove welds using SysWeld, developing thermal history property relationships for Fe-10Ni, and running optimization simulations in the computational design of experiments (CDoE) framework until sufficient parameters are developed.
Charpy V-Notch samples will be machined from a Fe-10Ni weld build-up and subjected to thermal simulations using the Gleeble thermo-mechanical simulator. Thermal histories from the CGHAZ, FGHAZ, and IC-CGHAZ, ICHAZ regions will be extracted and used for the Gleeble simulations. Charpy samples will also be taken from the top of the build-up to represent the as solidified weld metal condition. These regions represent the different microstructure regions that appear in multi-pass groove welds. All Charpy samples will be tested according to ASTM E23 and at the -60˚C (-51 ˚C) condition. Once the toughness values are obtained, they will be integrated into the CDoE along with the thermal history property relationships for microstructure and grain size. Welding parameters will be altered, and simulations will be run in the CDoE until the microstructure regions of lower toughness are reduced and the regions with superior toughness are increased. This will result in optimized welding parameters that produce welds with improved impact toughness |
| Proceedings Inclusion? |
Undecided |