| About this Abstract |
| Meeting |
2023 AWS Professional Program
|
| Symposium
|
2023 AWS Professional Program
|
| Presentation Title |
Isothermal Low Cycle Fatigue of Steel to Ni-based Alloys Dissimilar Joints |
| Author(s) |
Jacque Berkson, Antonio Ramirez, Shutong Zhang |
| On-Site Speaker (Planned) |
Jacque Berkson |
| Abstract Scope |
When designing structures utilizing dissimilar metal joints, material response to loading each thermal and mechanical must be taken into consideration. Furthermore, welded regions are scrutinized as potential points of failure. This work deploys an innovative Isothermal Low Cycle Fatigue (ILCF) test to simulate and predict pressure vessel service conditions of steels welded with nickel-base filler materials. Weld mockups fabricated by several welding procedures on a range of base and filler materials are evaluated at a temperature of 250C at strains ranging from 0.8% to 2%. Development of the ILCF test using a Gleeble 3800 thermo-mechanical simulator allows fully reversed strain control to be imposed on each base material, weld metal, and weld transition specimens elevated to the desired temperature by joule heating. Data outputs from the Gleeble as well as deployment of digital image correlation (DIC) methods allow the cyclic response and strain partitioning behavior to be evaluated. Metallurgical characterization compliments ILCF testing to specify the material evolution as it progresses from the as-welded condition throughout its fatigue life. The implications of this work are further expanded by incorporating a modeling component reflecting the material properties generated by the ILCF tests. This stage of work exemplifies the potential of this methodology to inform each fabrication and repair efforts employing dissimilar metal welding. A summary of findings surrounding the dissimilar metal welds in this study provide a unique insight into pressure vessel fabrication and repair from a material-focused perspective. Finally, critical discussion regarding the development of this ILCF test, including DIC adaptations, seeks to provide a framework for deployment, independent of industry or material. |
| Proceedings Inclusion? |
Undecided |