| About this Abstract |
| Meeting |
2022 AWS Professional Program
|
| Symposium
|
2022 AWS Professional Program
|
| Presentation Title |
Effect of Composition on Solidification Behavior and Resultant Microstructure in Dissimilar Electron Beam Welds between Commercially Pure Iron and Nickel |
| Author(s) |
Joris Hochanadel, Boyd Panton, Carolin Fink, John C. Lippold |
| On-Site Speaker (Planned) |
Joris Hochanadel |
| Abstract Scope |
Electron beam welding has a high degree of control and high welding speeds which enables unique processing regions for dissimilar metal welding. In this work, an electron beam weld was made between commercially pure nickel and iron. The weld started entirely in the nickel and progressed with a shallow angle across the joint, finishing entirely in the iron. This effectively allowed for a variable dilution level throughout the length of the weld. The beam was deflected in a circular pattern to promote complete fusion. Transverse cross-sections of the weld were made at 4 mm intervals to encompass the whole range of composition. The percentage of iron in the fusion zone increased along the length of the joint. Near 96wt% Fe, the fusion zone displayed a change in solidification mode from FCC austenite to BCC ferrite. The effect of composition on both solidification behavior and final microstructure was characterized using light optical microscopy and scanning electron microscopy of etched cross sections. Weld microstructure as a function of dilution of Ni and Fe as well as the region where the composition transitioned from the base material to the fusion zone were analyzed using energy dispersive spectroscopy, electron backscatter diffraction, and hardness measurements. |
| Proceedings Inclusion? |
Undecided |