| Title |
Solidification and Segregation Behaviors during Directional Solidification of High Chromium Martensitic Steels |
| Authors |
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) |
| DOI |
https://doi.org/10.3365/KJMM.2013.51.3.211 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
alloys; solidification; segregation; undercooling |
| 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. |