The effect of tungsten on microstructure and mechanical performance of an ultrafine Fe-Cr steel

•Fe-14Cr and Fe-14Cr-1 W alloys (wt%) were nanostructured by high pressure torsion.•Addition of W led to formation of smaller but more elongated ultrafine grains in Fe-Cr.•Ultrafine-grained Fe-Cr exhibited higher strength and plasticity with W alloying.•Ultrafine-grained Fe-Cr-W demonstrated better...

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Bibliographic Details
Published in:Materials letters 2018-09, Vol.227, p.292-295
Main Authors: Mazilkin, A., Abramova, M.M., Enikeev, N.A., Lomakin, I.V., Valiev, R.Z., Ivanisenko, Yu, Kübel, C., Etienne, A., Sauvage, X., Radiguet, B.
Format: Article
Language:English
Subjects:
Alloy steels
Chromium steels
Condensed Matter
Ferritic stainless steel
Ferritic steels
Ferrous alloys
Grain boundaries
High pressure torsion
Iron
Materials Science
Mechanical properties
Metals
Microstructure
Nanostructured materials
Physics
Plastic deformation
Silicon
Solid solutions
Transmission electron microscopy
Tungsten
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Summary:•Fe-14Cr and Fe-14Cr-1 W alloys (wt%) were nanostructured by high pressure torsion.•Addition of W led to formation of smaller but more elongated ultrafine grains in Fe-Cr.•Ultrafine-grained Fe-Cr exhibited higher strength and plasticity with W alloying.•Ultrafine-grained Fe-Cr-W demonstrated better thermal stability than Fe-Cr. Model Fe-Cr alloys with and without W were nanostructured by severe plastic deformation at 350˚C. Transmission electron microscopy observations of the microstructure indicate that the addition of 1 wt% of W led to a reduction of the mean grain size from 129 to 110 nm. Atom probe analyses show that only Cr and Si segregate at grain boundaries during deformation while W remains homogeneously distributed. This solid solution leads to higher mechanical strength and plasticity as compared to Fe-Cr. The origin of the beneficial effect of W on the mechanical performance is discussed.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.05.098