Paper Titles
Effects of Finishing Rolling Temperature on the Microstructural Behavior for Fe-0.1C Steel as a Function of Niobium Content
p.55
Plastic Deformation Behavior of Micro-Alloyed Cold Forging Steel
p.61
Abnormal Grain Growth of Fe-3%Si Steel Approached by Solid-State Wetting Mechanism
p.65
Analysis on Void Closure Behavior during Hot Open Die Forging
p.69
FIB and TEM Studies on the Bainitic Microstructure in Low Carbon HSLA Steels
p.73
The Potentiality of Micro-Scaled Multi-Filament Wire Forming Using Repetitive Hydrostatic Extrusion Process
p.77
Mechanical Behaviors of Mg-6%Al-0.2%Mn Based Casting Alloys
p.83
Processing and Tensile Property of Nano Dispersed Al-Fe-(Mo, V, Zr) Bulk Alloy
p.87
Enhanced Formability of AZ31 Magnesium Alloy Sheet Processed by Equal Channel Angular Rolling and Annealing Treatment
p.91

FIB and TEM Studies on the Bainitic Microstructure in Low Carbon HSLA Steels

Article Preview

Abstract:

In the present study, focused ion beam (FIB) technique was applied to make site-specific TEM specimens and to identify the 3-dimensional grain morphologies of bainitic microstructure in low carbon HSLA steels such as granular bainite, acicular ferrite and bainitic ferrite. Granular bainite consisted of fine subgrains and 2nd phase constituents like M/A or pearlite located at grain and subgrain boundaries. Acicular ferrite was characterized by an aggregate of ramdomly orientated and irregular shaped grains. The high angle boundaries between adjacent acicular ferrite grains caused by intragranular nucleation during continuous cooling process. Bainitic ferrite revealed uniform and parallel lath structure within the prior austenite grain boundaries and its’ packet size could effectively decreased by the formation of intragranular acicular ferrite.

You might also be interested in these eBooks
Advanced Materials and Processing View Preview

Info:

Periodical:

Advanced Materials Research (Volumes 26-28)

Pages:

73-76

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.26-28.73

Citation:

Cite this paper

Online since:

October 2007

Authors:

J.S. Kang, S.S. Ahn, C.Y. Yoo, Chan Gyung Park

Keywords:

Acicular Ferrite, Bainitic Ferrite, Focused Ion Beam (FIB), Granular Bainite, HSLA Steel

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] B. L. Bramfitt and J. G. Speer, Metall. Trans., Vol. 21A, April 1990, p.817.

Google Scholar

[2] H. Ohtani et al., Metall. Trans., Vol. 21A, April 1990, p.877.

Google Scholar

[3] G. Krauss and S. W. Thompson, ISIJ international, Vol 35 (1995), No. 8, pp.937-945.

Google Scholar

[4] L. C. Chang, Mater. Sci. and Eng., A368 (2004), pp.175-182.

Google Scholar

[5] H. J. Jun, J. S. Kang et al., Mater. Sci. And Eng., A422 (2006) p.157.

Google Scholar

[6] J. S. Kang, H. J. Jun et al., The 5th International Offshore and Polar Engineering Conference, June 19-24, 2005, Seoul, Korea.

Google Scholar

[7] Y. Ohmori, Microstructural Evolutions with Precipitation of Carbides in Steels, ISIJ international, Vol. 41, No. 6, (2001) 554-565S.

DOI: 10.2355/isijinternational.41.554

Google Scholar