| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Steels for Sustainable Development
|
| Presentation Title |
Probing Hydrogen-assisted Phase Transformations in Austenitic Stainless Steels Using Synchrotron X-ray Diffraction |
| Author(s) |
Samantha K. Lawrence, Reeju Pokharel, Bjørn Clausen, Donald W. Brown, John S. Carpenter, Mary K. O'Brien, Christopher W. San Marchi |
| On-Site Speaker (Planned) |
Samantha K. Lawrence |
| Abstract Scope |
Microstructures and defect populations produced by additive manufacturing (AM) are distinct from wrought products and influence performance in hydrogen-containing environments. The present work builds upon studies of microstructure, mechanical properties, and fracture of AM stainless steels (SS) by utilizing high energy synchrotron x-ray diffraction to probe hydrogen-metal interactions. The objective is to highlight unique aspects of hydrogen-deformation interactions and microstructural evolution during tensile deformation and fatigue loading of 304L SS produced through conventional upset forging and laser powder-bed fusion AM, with and without internal hydrogen (H). Solute H lowers the onset strain for austenite decomposition to martensite in both microstructures. The total fraction of transformation product is larger when the microstructure is H-saturated. Importantly, in the non-charged condition, forged SS did not undergo martensite transformation, while AM SS transformed readily at moderate strains. The interplay between microstructure, loading condition, and hydrogen content on propensity for austenite decomposition will be explored. |