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Simulation test for crystallization of inclusions in semi-killed steels during heat treatment prior to hot rolling

Title
Simulation test for crystallization of inclusions in semi-killed steels during heat treatment prior to hot rolling
Authors
Zhao, CJung, SMKashiwaya, YGaye, HLee, HG
POSTECH Authors
Jung, SM
Date Issued
2008-01
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKA
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 . SiO2). The TTT diagram from SHTT gives the nose position of gehlenite and anorthite of, respectively, 1200 s at 1200 degrees C and 4800 s at 1300 degrees 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.
Keywords
slag crystallization; semi-killed steel; TTT diagram; hot thermocouple; heat treatment cycle; IN-SITU OBSERVATION; THERMOCOUPLE TECHNIQUE; MOLD
URI
https://oasis.postech.ac.kr/handle/2014.oak/25949
ISSN
0915-1559
Article Type
Article
Citation
ISIJ INTERNATIONAL, vol. 48, no. 6, page. 747 - 754, 2008-01
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