Effect of Bulging and Solidification Structure on Segregation in Continuously Cast Slab

• Published in: Transactions of the Iron and Steel Institute of Japan 1984, Vol.24(11), pp.907-916
• Main Authors: SAEKI, Tsuyoshi, IMURA, Hiroshi, OONISHI, Yasuyuki, NIIMI, Hidetoshi, MIWA, Eiichi, YOSHIDA, Takaharu, IGARI, Shigenori, KITAMINE, Seiji
• Format: Article
• Language: English
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Gravity die casting and continuous casting; Iron and steel making; Materials science; Metals. Metallurgy; Methods of crystal growth; physics of crystal growth; Physics; Production of metals
• ISSN: 0021-1583; 1881-1183
• DOI: 10.2355/isijinternational1966.24.907

By the use of a center segregation simulator evaluation method, a test of center segregation was made quantitatively in relation to the amount of bulging and solidification structure. It became clear from the test that segregation is insignificant when the amount of bulging is zero but intensifies when the amount of bulging exceeds 200μm. On the basis of the test result, short pitch divided roll segments were installed on a continuous slab caster and a segregation alleviating test was made. The test results revealed that center segregation can greatly be alleviated if the solidification structure of the slab is changed to an equiaxed structure, and the bulging of slab is reduced by the use of a short-pitch divided roll stand. Solidification phenomena in the part of segregation-spot are discussed theoretically. And the EPMA data of spot segregation are well explained by the results of theoretical analysis.