| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Characterization of Residual Stresses in Fe-10 wt.% Ni Steel Weld Metal |
| Author(s) |
Daniel Bechetti, Tyler Christ, Brett Leister, Matthew Dantin |
| On-Site Speaker (Planned) |
Daniel Bechetti |
| Abstract Scope |
Welding residual stresses play an important role in the hydrogen cracking susceptibility, fatigue performance, and fabrication-induced distortion of high strength steels. Weldments fabricated using a U.S. Navy-developed Fe-10 wt.% Ni steel (‘10Ni steel’) filler metal have demonstrated qualitatively less distortion than those made using other high strength steel welding consumables. This work describes multi-scale and multi-technique investigations of the residual stress state associated with 10Ni steel weldments. Dilatometric analysis has identified the austenite-to-martensite reaction as the primary solid state transformation in 10Ni steel weld metal during cooling and has characterized the stability of the transformation across a range of cooling rates relevant to welding. Coupon-scale weld metal evaluation via the controlled-cooling Satoh test technique has demonstrated reduced stress build up in 10Ni steel, as compared to other high strength steel weld metals. Residual stresses in identically fabricated weldments produced using 10Ni steel and two other filler materials were quantified by neutron diffraction at Oak Ridge National Laboratory’s High Flux Isotope Reactor (HFIR). Hole drilling techniques were applied to the same weldments after neutron diffraction to complete correlations between coupon-scale, bulk-local, and bulk-multi-directional residual stresses. Finally, temperature-dependent weld metal thermophysical and mechanical properties were used to computationally model residual stresses using Simufact Welding. The experimental data were used to validate the model predictions. |
| Proceedings Inclusion? |
Undecided |