Authors: Nassar, H.¹; Korojy, B.²; Fredriksson, H.²

Source: Ironmaking & Steelmaking, Volume 36, Number 7, October 2009 , pp. 521-528(8)

Publisher: Maney Publishing

Abstract:

Growth irregularities in continuous casting are believed to be associated with crack formation and breakouts. Differential thermal analysis on 310S stainless steel samples indicated primary precipitations of both austenite and ferrite during solidification. In tensile tests on solidifying samples, abrupt shrinkages in volume were detected in the peritectic range of temperatures. Micrographic and microsegregation analysis on samples extracted from a breakout shell revealed high ratios of primary-precipitated austenite in the thick sections of the shell, and high ratios of primary-precipitated ferrite in the thin sections. Alternating precipitations of austenite and ferrite are proposed to occur during solidification. Regions of the shell with high ratios of primary austenite remain in contact with the mould and exhibit high growth rates, whereas regions with high ratios of primary ferrite shrink in volume due to the ferrite to austenite transformation, which results in the formation of air gaps between the shell and the mould and reductions in growth rate.

Keywords: GROWTH IRREGULARITIES; CONTINUOUS CASTING; SHRINKAGE; PERITECTIC; STAINLESS STEEL; PRECIPITATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328109X445714

Affiliations: 1: Materials Processing, Royal Institute of Technology (KTH), Brinellvägen 23, S-10044 Stockholm, Sweden;, Email: hanin@matpr.kth.se 2: Materials Processing, Royal Institute of Technology (KTH), Brinellvägen 23, S-10044 Stockholm, Sweden

Publication date: 2009-10-01

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