During irradiation or high-temperature aging, stainless steel can develop precipitates, significantly affecting mechanical properties. In this study atom probe tomography (APT) was used to study grain boundary segregation and secondary phases in a purely austenitic SS304 (a Fe-18Cr-8Ni steel) processed by high-pressure torsion (HPT) at 300 °C. Ni, Mn, Si enriched phase was observed at grain boundaries, and Cu nanoprecipitates were observed along and near phase/grain boundaries. Precipitation is facilitated by deformation assisted segregation along grain boundaries with a mechanism similar to vacancy diffusion in irradiated steels.
|Ранняя дата в режиме онлайн||12 фев 2019|
|Состояние||Опубликовано - мая 2019|
|Опубликовано для внешнего пользования||Да|
- Nanocrystalline materials
- Atom probe tomography
- Severe plastic deformation
- high pressure torsion