Abstract
The selection and the formation of carbide govern quality and the service life of hot steel milling rolls. Thus the microsegregation and the formation of the carbides and the graphite during the solidification have been investigated for high speed steel type cast iron and Ni-hard type cast iron. The crystallization of high speed steel type cast iron proceeds in the order of primary austenite (γ), γ+MC and γ+M2C eutectic. On the other hand, in Ni-hard type cast iron, eutectic graphite flakes can crystallize after the formation of primary γ, and γ+M3C eutectic by controlling the content of Ni and Si in spite of containing strong carbide formers such as Cr. As γ+carbide eutectic grows, the residual liquid among eutectic cells becomes rich or poor in carbide formers according the partition coefficient between residual liquid and eutectic cell. It is realized that the change of composition of carbide formers during the solidification is estimated with Scheil-Gulliver equation and computed phase diagrams in both of cast irons. The graphite forming tendency is also evaluated by applying the parameter, which expresses the solubility limit of carbon to the molten iron for Ni-hard type cast iron.
| Original language | English |
|---|---|
| Pages (from-to) | 1075-1079 |
| Number of pages | 5 |
| Journal | isij international |
| Volume | 49 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - Oct 23 2009 |
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All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Mechanics of Materials
- Materials Chemistry
- Metals and Alloys
Cite this
Solute concentration and carbides formation for steel milling rolls. / Miyahara, Hirofumi; Bravo, Sergio Villanueva; Yamamoto, Kaoru; Ogi, Keisaku.
In: isij international, Vol. 49, No. 7, 23.10.2009, p. 1075-1079.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Solute concentration and carbides formation for steel milling rolls
AU - Miyahara, Hirofumi
AU - Bravo, Sergio Villanueva
AU - Yamamoto, Kaoru
AU - Ogi, Keisaku
PY - 2009/10/23
Y1 - 2009/10/23
N2 - The selection and the formation of carbide govern quality and the service life of hot steel milling rolls. Thus the microsegregation and the formation of the carbides and the graphite during the solidification have been investigated for high speed steel type cast iron and Ni-hard type cast iron. The crystallization of high speed steel type cast iron proceeds in the order of primary austenite (γ), γ+MC and γ+M2C eutectic. On the other hand, in Ni-hard type cast iron, eutectic graphite flakes can crystallize after the formation of primary γ, and γ+M3C eutectic by controlling the content of Ni and Si in spite of containing strong carbide formers such as Cr. As γ+carbide eutectic grows, the residual liquid among eutectic cells becomes rich or poor in carbide formers according the partition coefficient between residual liquid and eutectic cell. It is realized that the change of composition of carbide formers during the solidification is estimated with Scheil-Gulliver equation and computed phase diagrams in both of cast irons. The graphite forming tendency is also evaluated by applying the parameter, which expresses the solubility limit of carbon to the molten iron for Ni-hard type cast iron.
AB - The selection and the formation of carbide govern quality and the service life of hot steel milling rolls. Thus the microsegregation and the formation of the carbides and the graphite during the solidification have been investigated for high speed steel type cast iron and Ni-hard type cast iron. The crystallization of high speed steel type cast iron proceeds in the order of primary austenite (γ), γ+MC and γ+M2C eutectic. On the other hand, in Ni-hard type cast iron, eutectic graphite flakes can crystallize after the formation of primary γ, and γ+M3C eutectic by controlling the content of Ni and Si in spite of containing strong carbide formers such as Cr. As γ+carbide eutectic grows, the residual liquid among eutectic cells becomes rich or poor in carbide formers according the partition coefficient between residual liquid and eutectic cell. It is realized that the change of composition of carbide formers during the solidification is estimated with Scheil-Gulliver equation and computed phase diagrams in both of cast irons. The graphite forming tendency is also evaluated by applying the parameter, which expresses the solubility limit of carbon to the molten iron for Ni-hard type cast iron.
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U2 - 10.2355/isijinternational.49.1075
DO - 10.2355/isijinternational.49.1075
M3 - Article
VL - 49
SP - 1075
EP - 1079
JO - ISIJ International
JF - ISIJ International
SN - 0915-1559
IS - 7
ER -