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CHARACTERIZATION OF BAINITIC MICROSTRUCUTRES IN LOW CARBON HSLA STEELS SCIE SCOPUS

Title
CHARACTERIZATION OF BAINITIC MICROSTRUCUTRES IN LOW CARBON HSLA STEELS
Authors
Kang, JSPark, CG
Date Issued
2008-12-30
Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
Abstract
The austenite phase of low carbon steels can be transformed to various bainitic microstructures such as granular bainite, acicular ferrite and bainitic ferrite during continuous cooling process. In the present study site-specific transmission electron microscope (TEM) specimens were prepared by using focused ion beam (FIB) to identify the bainitic microstructure in low carbon high strength low alloy (HSLA) steels clearly. Granular bainite was composed of fine subgrains and 2(nd) phase constituents like M/A or pearlite located at grain and/or subgrain boundaries. Acicular ferrite was identified as an aggregate of randomly orientated needle-shaped grains. The high angle relations among acicular ferrite grains were thought to be caused by intra-granular nucleation, which could be occur under the high cooling rate condition. Bainitic ferrite revealed uniform and parallel lath structure within the packet. In some case, however, the parallel lathes showed high angle relations due to packet overlapping during grow of bainitic ferrite, resulting in high toughness properties in bainitic ferrite based steels.
Keywords
Granular bainite; acicular ferrite; bainitic ferrite; low carbon steels; DEFORMATION; MORPHOLOGY
URI
https://oasis.postech.ac.kr/handle/2014.oak/28649
DOI
10.1142/S0217979208051443
ISSN
0217-9792
Article Type
Article
Citation
INTERNATIONAL JOURNAL OF MODERN PHYSICS B, vol. 22, no. 31-32, page. 5965 - 5970, 2008-12-30
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박찬경PARK, CHAN GYUNG
Dept of Materials Science & Enginrg
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