An Investigation of the Crystallization of a Continuous Casting Mold Slag Using the Single Hot Thermocouple Technique.
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- Kashiwaya Yoshiaki
- Faculty of Engineering, Hokkaido University
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- Cicutti Carlos E.
- Department of Materials Science and Engineering, Carnegie Mellon University
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- Cramb Alan W.
- Department of Materials Science and Engineering, Carnegie Mellon University
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The conditions under which crystallization develops in a mold slag must be understood in order to select or design a mold flux for use in the continuous casting of steels. In this paper, the crystallization of an industrial mold slag was quantified using a single hot thermocouple technique which, when combined with a video camera based observation system, allowed observation of the onset and growth of the crystals which were precipitated from the melt. The beginning of crystallization was determined by direct observation and the growth rate of crystals were measured by frame by frame image analysis of recordings of the progress of crystallization. Isothermal experiments were performed at different temperatures and a Time-Temperature-Transformation (TTT) diagram was determined for this industrial mold slag. X-ray diffraction of quenched samples was used to determine the type of crystalline phases that were precipitated. The TTT diagram was divided into two separate regions which corresponded to the precipitation of dicalcium silicate (Ca2SiO4) at temperatures over 1050°C and of Cuspidine (Ca4Si2O7F2) at temperatures below 1050°C. The evolution crystal fraction was described by Avrami's equation. This work indicates that industrial mold slags are easily undercooled, that crystallization occurs throughout the melt, that crystals grow initially as equiaxed dendrites and that the onset of crystallization is a function of cooling rate and must be described by either TTT or CCT curves.
収録刊行物
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- ISIJ International
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ISIJ International 38 (4), 357-365, 1998
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390001206452818432
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- NII論文ID
- 10002459151
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- NII書誌ID
- AA10680712
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- COI
- 1:CAS:528:DyaK1cXjsV2itbc%3D
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- ISSN
- 13475460
- 09151559
- http://id.crossref.org/issn/00211583
- http://id.crossref.org/issn/09151559
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- HANDLE
- 2115/75701
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可