Correlation of Microstructure and Cracking Phenomenon Occurring during Hot Rolling of Lightweight Steel Plates |
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Authors: | Sang Yong Shin Hackcheol Lee Seung Youb Han Chang-Hyo Seo Kayoung Choi Sunghak Lee Nack J. Kim Jai-Hyun Kwak Kwang-Geun Chin |
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Affiliation: | (1) Center for Advanced Aerospace Materials, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea;(2) Graduate Institute of Ferrous Technology, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea;(3) Plate Research Group, Technical Research Laboratories, Pohang Iron and Steel Company (POSCO), Pohang, 790-785, Korea;(4) Automotive Steels Research Group, Technical Research Laboratories, Pohang Iron and Steel Company (POSCO), Pohang, 790-785, Korea;; |
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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 κ-carbides were well developed along the rolling direction. Detailed microstructural analyses showed that cracks initiated at film-type κ-carbides continuously formed interfaces between bands, while the band populated with κ-carbides did not play an important role in initiating cracks. Thus, the formation of band structures and film-type interfacial κ-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. |
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