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Vol.51, No.3, 211 ~ 221, 2013
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| Title |
| Solidification and Segregation Behaviors during Directional Solidification of High Chromium Martensitic Steels |
| 박경미 Kyung Mi Park , 구지호 Ji Ho Gu , 서성문 Seong Moon Seo , 정희원 Hee Won Jeong , 신종호 Jong Ho Shin , 심권보 Kwon Bo Sim , 이재현 Je Hyun Lee |
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| Abstract |
| Directional solidification experiments were carried out on modified 9Cr1Mo steel and 10Cr1MoW steel to investigate their solidification and segregation characteristics. Under a given temperature gradient, both steels were solidified at the same growth rates of 1, 5, 50 and 100 μm/s, respectively. A detailed study of the solidification sequence for both steels revealed that delta ferrite was the leading phase and gamma austenite nucleated from the solid solidified earlier. A quick phase transformation of delta into gamma was made at growth rates faster than 50 μm/s. Therefore, almost all delta dendrites were identified as gamma phases to be transformed. On the other hand, compositional analyses performed on the solid/liquid interface confirmed that alloying elements in both steels were hardly segregated ahead of the solid/liquid interface. This appears to be responsible for a very narrow freezing range which suppresses elemental segregation. |
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| Key Words |
| alloys, solidification, segregation, undercooling |
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