High-Pressure Torsion Assisted Segregation and Precipitation in a Fe-18Cr-8Ni Austenitic Stainless Steel
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.
A. Hoffman et al., "High-Pressure Torsion Assisted Segregation and Precipitation in a Fe-18Cr-8Ni Austenitic Stainless Steel," Materials Letters, vol. 243, pp. 116-119, Elsevier B.V., May 2019.
The definitive version is available at https://doi.org/10.1016/j.matlet.2019.02.030
Materials Science and Engineering
Keywords and Phrases
Atom probe tomography; Diffusion; High pressure torsion; Nanocrystalline materials; Segregation; Severe plastic deformation
International Standard Serial Number (ISSN)
Article - Journal
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