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Correlation of Microstructure and Cracking Phenomenon Occurring during Hot Rolling of Lightweight Steel Plates

Title
Correlation of Microstructure and Cracking Phenomenon Occurring during Hot Rolling of Lightweight Steel Plates
Authors
Sang Yong ShinHackcheol LeeSeung Youb HanChang-Hyo SeoKayoung ChoiLee, SKim, NJJai-hyun KwakKwang-Geun Chin
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2010
Publisher
SPRINGER
Abstract
An investigation was conducted into the correlation of microstructure and the cracking phenomenon that often occurred in hot-rolled lightweight steel plates. Two kinds of steels were fabricated with varying Mn and Al contents, and their microstructures, tensile properties, and high-temperature transformation behavior were investigated. In the two steels, banded structures containing ferrite grains and kappa-carbides were well developed along the rolling direction. Detailed microstructural analyses showed that cracks initiated at film-type kappa-carbides continuously formed interfaces between bands, while the band populated with kappa-carbides did not play an important role in initiating cracks. Thus, the formation of band structures and film-type interfacial kappa-carbides must be minimized to prevent the cracking. The decreased content of hardenability elements, including aluminum, higher finish-rolling temperature, reduced central segregation during the slabmaking process, and decreased material variation during hot rolling, were suggested as practical methods for preventing the cracking.
URI
http://oasis.postech.ac.kr/handle/2014.oak/26006
DOI
10.1007/S11661-009-0081-1
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 41A, no. 1, page. 138 - 148, 2010-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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