Paper Titles
Some New Trends in SPD Processing for Fabrication of Bulk Nanostructured Materials
p.3
Nanocrystalline Structure in Steels Produced by Various Severe Plastic Deformation Processes
p.11
Developing a Model for Grain Refinement in Equal-Channel Angular Pressing
p.19
Effect of Initial Grain Size, Die Angle and Pass Sequence on the Formation of Ultrafine Grain Structure in Cu by ECAP
p.25
Local Investigations of the Mechanical Properties of Ultrafine Grained Metals by Nanoindentations
p.31
The Positive Role of Back-Pressure in Equal Channel Angular Extrusion
p.37
On the Grain Refinement Mechanisms in SPD – Applying High Resolution Electron Microscopy and the LEDS Approach
p.45
On the Microstructure of HPT Processed Cu under Variation of Deformation Parameters
p.51
Deformation Induced Vacancies with Severe Plastic Deformation: Measurements and Modelling
p.57

Nanocrystalline Structure in Steels Produced by Various Severe Plastic Deformation Processes

Article Preview

Abstract:

The formation of nanocrystalline structure in steels by ball milling, shot peening and drilling were studied. In ball milling and shot peening, nanocrystalline layers form with sharp boundaries from deformed structure regions. Nanocrystalline layer showed extremely high hardness. By annealing, nanocrystalline layer showed substantially slow grain growth without recrystallization. The temperature of the specimen during deformation is low and deformation is done in ferrite state. In drilling, several μm thick nanocrystalline layers form at the top surface of a drill hole. Nanocrystalline layers showed high hardness and good thermal stability. The fresh martensite and retained austenite near a drill hole indicate that the temperature reached above Ac3 and nanocrystalline layers are produced in austenite condition. It is recognized that nanocrystalline layers produced in the processes studied in the present investigation has similar characteristics irrespective of the temperature it produced. It is proposed that deformation with a large strain gradient is an important condition to produce nanocrystalline structure.

You might also be interested in these eBooks
Nanomaterials by Severe Plastic Deformation View Preview

Info:

Periodical:

Materials Science Forum (Volumes 503-504)

Pages:

11-18

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.503-504.11

Citation:

Cite this paper

Online since:

January 2006

Authors:

Minoru Umemoto, Yoshikazu Todaka, Jin Guo Li, Koichi Tsuchiya

Keywords:

Ball Mill, Drilling, Microstructure, Nanocrystalline, Shot Peening, Steel, Strain Gradient

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2006 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] R.Z. Valiev, N.A. Krasilnikov and N.K. Tsenev: Mater. Sci. Eng. A 137 (1991) p.35.

Google Scholar

[2] Y. Saito, H. Utsunomiya, N. Tsuji and T. Sakai: Acta Mater. 47 (1999) p.579.

Google Scholar

[3] J.S.C. Jang and C.C. Koch: Sripta Metal. 24 (1990) p.1599.

Google Scholar

[4] R.Z. Valiev, Y.V. Ivanisenko, E.F. Rauch and B. Baudelet: Acta Mater. 44 (1996) p.4705.

Google Scholar

[5] P. Heilmann, W. A.T. Clark and D.A. Rigney: Acta Metall. 31 (1983) p.1293.

Google Scholar

[6] N.R. Tao, M.L. Sui, J. Ku and K. Lu: NanoStructured Mater. 11 (1999) p.433.

Google Scholar

[7] M. Umemoto, Y. Todaka, K. Tsuchiya: Mater. Trans. 44 (2003) p.1488.

Google Scholar

[8] Y. Todaka, M. Umemoto, S. Tanaka and K. Tsuchiya: Mater. Trans. 45 (2004) p.376.

Google Scholar

[9] S. Akcan, S. Shah, S.P. Moylan, S.N. Chhabra, S. Chandrasekar, H.T.Y. Yang : Metal. Mater. Trans. A, 33A(2002) p.1245.

Google Scholar

[10] B.J. Griffiths: J. Tribology 109 (1987) p.525.

Google Scholar

[11] M. Umemoto: Mater. Trans. 44 (2003) p. (1900).

Google Scholar

[12] N. Kamikawa, N. Tsuji, T. Sakai and Y. Minamino: Proc. of the 25th RISO Int. Symp. on Mater. Sci., (2004) p.369.

Google Scholar

[13] H. Lin, C. Xu, B.Q. Han, E.J. Lavernia and T.G. Langdon : Proceeding of Ultrafine Grained Materials III TMS (2004) p.523.

Google Scholar

[14] R. Kaibyshev, I. Kazakulov, T. Sakai, A. Belyakov : ISUGS (2001) p.152.

Google Scholar

[15] A.P. Zhilyaev, S. Lee, G.V. Nurislamova, R.Z. Valiev, and T.G. Langdon : Scripta mater. 44(2001) p.2753.

DOI: 10.1016/s1359-6462(01)00955-1

Google Scholar

[16] M. F. Ashby : Philos. Mag. 21(1970) p.399.

Google Scholar

[17] J. Gil Sevillano : Proc. of 25th Riso International. Symposium on Materials Sciece (2004) p.1.

Google Scholar