Paper Titles
Lotus-Type Porous Nickel-Free Stainless Steel with High Temperature Nitriding
p.756
Selective Oxidation of Manganese and Chromium during Annealing of Low Carbon Strip Steels
p.762
Enhancing Surface Properties of Fine Grain Duplex Stainless Steel via Superplastic Carburizing
p.768
Deformation Behaviour of Martensite in a Low-Carbon Dual-Phase Steel
p.774
Effect of Second Phase on Mechanical Properties of Bainite-Base Steels
p.780
Effects of Thermo-Mechanical Process on the Microstructure and Mechanical Properties of Low Carbon HSLA Steels
p.786
Oxide Scales Grown on Stainless Steels during Simulated Reheat
p.792
Original Position Statistic Distribution Analysis for Al Inclusion in Continuous-Casting Thin Slab
p.798
Fatigue Strength and Fracture Mechanisms of IF28 Steels
p.804

Effect of Second Phase on Mechanical Properties of Bainite-Base Steels

Article Preview

Abstract:

Effects of acicular ferrite and retained austenite on the mechanical properties of bainite-base steels were investigated. Various morphology and volume fraction of constituent phases have been obtained by control of hot rolling conditions and alloy compositions. It has been shown that the steels containing retained austenite have better combinations of strength and ductility than the ones with no retained austenite. However, there is no noticeable change in DBTT by the incorporation of retained austenite in the microstructure since retained austenite exists as fine particles. On the other hand, DBTT of the steels are largely affected by the presence of acicular ferrite in the microstructure. EBSD analyses of fractured Charpy specimens show that cracks are deflected within the morphological packet of acicular ferrite, indicating its role in reducing the effective grain size of the steels.

You might also be interested in these eBooks
THERMEC 2006 Supplement View Preview

Info:

Periodical:

Advanced Materials Research (Volumes 15-17)

Pages:

780-785

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.15-17.780

Citation:

Cite this paper

Online since:

February 2006

Authors:

Hak Cheol Lee, Xiao Dan Wu, Young Min Kim, Nack Kim

Keywords:

Acicular Ferrite, Bainite-Base Steel, Retained Austenite, Toughness

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] N.J. Kim and G. Thomas: Scr. Metall. Vol. 18 (1984), p.817.

Google Scholar

[2] Y.S. Choi, I.M. Park, J.H. Kim, K.M. Cho and D.L. Lee: Met. Mater. -Int. Vol. 11 (2005), p.327.

Google Scholar

[3] J. W. Kim, J. W. Choi and D. B. Lee: Met. Mater. -Int. Vol. 11 (2004), p.131.

Google Scholar

[4] Y. M. Kim, S. K. Kim, Y. J. Lim and N. J. Kim: ISIJ Inter. Vol. 42 (2002), p.1571.

Google Scholar

[5] B. Hwang, S. Lee, Y.M. Kim, N.J. Kim and S.S. Ahn: Metall. Mater. Trans. A Vol. 36 (2005), p.725.

Google Scholar

[6] N. J. Kim and G. Thomas: Metall. Mater. Trans. A Vol. 12 (1981), p.483.

Google Scholar

[7] N. J. Kim, S. Lee and Y. W. Chang: POSCO report (2003).

Google Scholar

[8] Y. M. Kim, S. K. Kim and N. J. Kim: Mater. Sci. Forum Vol. 475-479 (2005), p.289.

Google Scholar

[9] H. J. Koh, S. K. Lee, S. H. Park, S. J. Choi, S. J. Kwon and N. J. Kim: Scripta Mater. Vol. 38 (1998), p.763.

Google Scholar

[10] W. C. Chang and J. H. Chung: Mater. Charact. Vol. 26 (1991), p.53.

Google Scholar

[11] C. G. Lee , S.J. Kim, T.H. Lee and S. Lee: Mater. Sci. Eng. A Vol. 371 (2004), p.16.

Google Scholar

[12] A. R. Marder: Formable HSLA and Dual Phase Steels (TMS-AIME, USA 1979).

Google Scholar

[13] J. B. Glimour, G. R. Purdy and J. S. Kirkaldy: Metall. Mater Trans. A Vol. 3 (1972), p.1445.

Google Scholar

[14] Y. M. Kim, H. Lee, J. Y. Yoo and N. J. Kim: Proceeding of ISOPE, 2005 (2005).

Google Scholar

[15] N. J. Kim and A. H. Nakagawa: Mater. Sci. Eng. A Vol. 83 (1986), p.145.

Google Scholar