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Simulation Test for Crystallization of Inclusions in Semi-killed Steels during Heat Treatment Prior to Hot Rolling

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ISIJ International, Vol. 48 (2008), No. 6, pp. 747-754.pdf1.72 MBPDFView/Open
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Title: Simulation Test for Crystallization of Inclusions in Semi-killed Steels during Heat Treatment Prior to Hot Rolling
Authors: Zhao, Chong Browse this author
Jung, Sung-Mo Browse this author
Kashiwaya, Yoshiaki Browse this author →KAKEN DB
Gaye, Henri Browse this author
Lee, Hae-Geon Browse this author
Keywords: slag crystallization
semi-killed steel
TTT diagram
hot thermocouple
Heat treatment cycle
Issue Date: 15-Jun-2008
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 48
Issue: 6
Start Page: 747
End Page: 754
Publisher DOI: 10.2355/isijinternational.48.747
Abstract: The SHTT (Single Hot Thermocouple Technique) has been used to determine the crystallization behavior of a composition of the CaO–Al2O3–SiO2 system, representative of inclusions in semi-killed steels. XRD and SEM have been employed, respectively, to detect the crystalline phases and to analyze the morphology, quantity and properties of crystals. The same composition has also been studied by quenching the oxides in iron crucibles, a method which had been proven reliable to simulate the actual behavior of inclusions in steel samples during heat treatment prior to hot rolling. The TTT diagrams obtained by using the above two techniques are almost identical. The observed crystalline phases for this composition are gehlenite (2CaO·Al2O3·SiO2) and anorthite (CaO·Al2O3·2SiO2). The TTT diagram from SHTT gives the nose position of gehlenite and anorthite of, respectively, 1200 s at 1200°C and 4800 s at 1300°C. Thus, the Hot Thermocouple Technique (DHTT or SHTT), already largely used to study the crystallization behavior of CC mold slags is shown to be suitable to simulate the crystallization behavior of inclusions with much higher SiO2 contents.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 柏谷 悦章

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