MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Microstructure of Cast Strip in 0.1 mass%C Steels Containing Phosphorus
Koichi HirataOsamu UmezawaKotobu Nagai
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2002 Volume 43 Issue 3 Pages 305-310

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Abstract

Cast strips of 0.1 mass%C steels with phosphorus contents ranging from 0.01 to 0.2 mass% have been produced by using a twin drum type continuous casting machine, and their microstructures have been characterized. Fine dendrite structure in the strips provides a fine dispersion of the segregated phosphorus regime. Phosphorus addition changes the α grain structure dramatically and decreases the γ grain size. The EPMA (Electron Probe Micro Analyzer) mapping and the diffusion analysis of phosphorus in the γ phase indicate the presence of a retained δ phase in the austenite temperature. The pinning effect of the δ-ferrite on the γ-grain growth must be kept in the temperature range of the rapid γ grain growth. The balance of strength and ductility for the cast strip is improved as the phosphorus content increases.

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© 2002 The Japan Institute of Metals and Materials
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