Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455497 | Materials Science and Engineering: A | 2017 | 10 Pages |
Abstract
The present study deals with the grain refinement of a high nitrogen duplex stainless steel through cold rolling up to 80% and subsequent reversion annealing in the range of 750 °C to 1100 °C at various duration times. The microstructural observations showed that the nano/ultrafine-grained (NG/UFG) austenite with the grain size of 400 nm was obtained by annealing at 900 °C for 30 s due to ά-martensite to austenite complete reverse transformation. The NG/UFG duplex steel indicated a superior mechanical properties consist of 1 GPa yield strength (YS) and 40% elongation to fracture. The transmission electron microscopy study of the tensile deformed NG/UFG material indicated that the nature of extraordinary plasticity in NG/UFG material is because of the dense planar defects, specifically, the twin/twin-like induced plasticity effect in austenite, accompanied with strain accommodation of coarse grain ferrite phase.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Mohammad Moallemi, Abbas Zarei-Hanzaki, Sung-Joon Kim, Changwan Hong, Pooriya Dastranjy Nezhadfar,