Structural evolution during nanostructuring of additive manufactured 316L stainless steel by high-pressure torsion
| Autor: | Isshu Lee, Stanislav A. Evlashin, Yulia O. Kuzminova, Megumi Kawasaki, Klaus-Dieter Liss, Jae-Kyung Han, Xiaojing Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Austenite
Materials science Mechanical Engineering Torsion (mechanics) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material Grain size 0104 chemical sciences Mechanics of Materials Lattice (order) Phase (matter) Martensite General Materials Science Crystallite Composite material 0210 nano-technology |
| Zdroj: | Materials Letters. 302:130364 |
| ISSN: | 0167-577X |
| DOI: | 10.1016/j.matlet.2021.130364 |
| Popis: | This study investigates the structural evolution including crystallite size, micro-strain, and lattice parameters of an additive manufactured 316L stainless steel during post-printing nanostructuring by high-pressure torsion (HPT) at room temperature. Formation of a martensite phase was observed in the nanostructured austenitic steel having an average grain size of 60 nm after 8 HPT turns. Significant strain gradients exist between the close-packed planes and out-of-close-packed-planes in the nanocrystalline structure, while such strain gradient was not observed in the as-built material. Structural changes occur in a very early stage of nanostructuring through 1/2 HPT turn and are attributed to severe lattice distortion by the excess of dislocations and defects. |
| Databáze: | OpenAIRE |
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