TY - JOUR
T1 - Effect of warm deformation on microstructure and mechanical properties of a layered and nanostructured 304 stainless steel
AU - Chen, A. Y.
AU - Shi, S. S.
AU - Tian, H. L.
AU - Ruan, H. H.
AU - Li, X.
AU - Pan, D.
AU - Lu, J.
PY - 2014
Y1 - 2014
N2 - A layered and nanostructured (LN) stainless steel was fabricated by surface mechanical attrition treatment (SMAT) combined with warm co-rolling (WCR) in order to improve the low ductility of nanostructured metallic materials. The influences of rolling temperature and strain on the microstructure are investigated. The microstructure of LN steel is characterized by methods of transmission electron microscopy (TEM), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results reveal that the microstructure of LN steels presents a periodic distribution of nanocrystalline layer, ultra-fine grained layer and coarse grained layer with graded transition of grain size. The integrated effects of SMAT and WCR on the refinement of grain size, involving in dislocation subdivision, twinning and dynamic recrystallization, are discussed. The tensile properties of LN steels exhibit both high strength and good ductility resulting from good work hardening behavior. The strengthening mechanisms by grain size refinement, α'-martensite transformation and twinning are explored. © 2013 Elsevier B.V.
AB - A layered and nanostructured (LN) stainless steel was fabricated by surface mechanical attrition treatment (SMAT) combined with warm co-rolling (WCR) in order to improve the low ductility of nanostructured metallic materials. The influences of rolling temperature and strain on the microstructure are investigated. The microstructure of LN steel is characterized by methods of transmission electron microscopy (TEM), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The experimental results reveal that the microstructure of LN steels presents a periodic distribution of nanocrystalline layer, ultra-fine grained layer and coarse grained layer with graded transition of grain size. The integrated effects of SMAT and WCR on the refinement of grain size, involving in dislocation subdivision, twinning and dynamic recrystallization, are discussed. The tensile properties of LN steels exhibit both high strength and good ductility resulting from good work hardening behavior. The strengthening mechanisms by grain size refinement, α'-martensite transformation and twinning are explored. © 2013 Elsevier B.V.
KW - Mechanical properties
KW - Microstructure
KW - Nanostructured material
KW - SMAT
KW - Stainless steel
KW - Warm deformation
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84890338245&origin=recordpage
U2 - 10.1016/j.msea.2013.11.052
DO - 10.1016/j.msea.2013.11.052
M3 - RGC 21 - Publication in refereed journal
SN - 0921-5093
VL - 595
SP - 34
EP - 42
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
ER -