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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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References

1 The Materials Information Society. ASM Specialty Handbook: Stainless Steel. Metals Park: ASM International, 1994 Google Scholar
2 Tomimura, K., Takaki, S., Tanimoto, S., Tokunaga, Y., ISIJ International, 31 No. 7 (1991): 721 Google Scholar
3 Takaki, S., Tomimura, K., Ueda, S., ISIJ International, 34 No. 6 (1994): 522Google Scholar
4 Ma, Y., Jin, J. E., Lee, Y. K., Scripta Materialia, 52 (2005): 1311 Google Scholar
5 Somani, M. C, Karjalainen, P., Juntunen, P., Rajasekhara, S., Ferreira, P. J., Kyröläinen, A., Taulavuori, T., Aspegren, P., ISUGS-2005, Sanya, China. Google Scholar
6 Johannsen, D. L., Ferreira, P. J., Kyröläinen, A., Metall. Trans. A, (submitted)Google Scholar
7 Rajasekhara, S., Somani, M. C., Karjalainen, L. P. Kyröläinen, A., Ferreira, P. J., ISUGS – 2005, Sanya, China.Google Scholar
8 Somani, M. C, Karjalainen, L. P., Kyröläinen, A., Taulavuori, T., Aspegren, P., CEDINOX-2005, Seville, Spain Google Scholar
9 Sourmail, T., Materials Science and Technology, 17 No. 1 (2001): 1 Google Scholar
10 di Schino, A., Barteri, M., Kenny, J. M, J. of Materials Science Letters, 21 No. 9 (2002) 751 Google Scholar
11 Rajasekhara, S., Karjalainen, L. P., Kyröläinen, A., Ferreira, P. J., (to be submitted)Google Scholar
12 Kashyap, B. P., Tangri, K., Acta Metall. Mater., 43 No. 11 (1995) 3971 Google Scholar
13 Chen, X. H., Lu, J., Lu., K., Lu, L., Scripta Materialia, 52 (2005) 1039 Google Scholar