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Submicron/nano Grained Stainless Steel with Superior Mechanical Properties

Published online by Cambridge University Press:  26 February 2011

Shreyas Rajasekhara ,
M. C. Somani ,
M. Koljonen ,
L. P. Karjalainen ,
A. Kyröläinen  and
P. J. Ferreira
Shreyas Rajasekhara
Affiliation:
[email protected], The University of Texas at Austin, Materials Science and Engineering, 1 University Station, C2201, Austin, TX, 78712, United States, (512) 471-3963
M. C. Somani
Affiliation:
Department of Mechanical Engineering, University of Oulu, 90014 Oulu, Finland
M. Koljonen
Affiliation:
Department of Mechanical Engineering, University of Oulu, 90014 Oulu, Finland
L. P. Karjalainen
Affiliation:
Department of Mechanical Engineering, University of Oulu, 90014 Oulu, Finland
A. Kyröläinen
Affiliation:
Outokumpu Stainless Oy, 95400 Tornio, Finland
P. J. Ferreira
Affiliation:
Materials Science and Engineering, The University of Texas at Austin, Austin, Texas – 78712, USA
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Abstract

Metastable austenitic stainless steels may transform to martensite when subjected to cold rolling. Upon subsequent annealing the martensite reverts back to ultra-fine grained austenite. Based on this concept, nano/submicron austenitic grains have been produced in a 63% cold rolled commercial AISI 301LN subjected to annealing treatments at 600°C, 800°C and 1000°C for 1, 10 and 100 seconds.

Transmission Electron Microscopy (TEM) observations show the formation of equiaxed austenitic grains as small as ∼ 200nm in samples annealed at 800°C, and a dramatic increase in grain size as the annealing temperature and duration is increased. Additional tensile tests indicate that samples annealed at 800°C for 1 second exhibit a yield strength of ∼ 740 MPa and an total elongation of ∼ 45%. This combination of strength and ductility is excellent exceeding those of conventionally annealed steels (σy=350 MPa; Ductility ∼ 40%) or cold-rolled steels (σy=650 MPa; Ductility ∼ 30%).

Finally, a correlation between the observed grain sizes and mechanical properties, in particular the yield strength, is obtained. Preliminary analysis indicates that the Hall-Petch equation can satisfactorily relate the observed yield strength with corresponding grain sizes.

Keywords

strengthnanoscaletransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 903: Symposium Z – Amorphous and Nanocrystalline Metals for Structural Applications , 2005 , 0903-Z05-40
Copyright
Copyright © Materials Research Society 2006

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