MICROSEGREGATION OF SOLUTE ELEMENTS IN SOLIDIFYING MUSHY ZONE OF STEEL AND ITS EFFECT ON LONGITUDINAL SURFACE CRACKS OF CONTINUOUS CASTING STRAND

Acta Metall Sin

2009, Vol. 45

Issue (8): 949-955 DOI:

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MICROSEGREGATION OF SOLUTE ELEMENTS IN SOLIDIFYING MUSHY ZONE OF STEEL AND ITS EFFECT ON LONGITUDINAL SURFACE CRACKS OF CONTINUOUS CASTING STRAND

CAI Zhaozhen; ZHU Miaoyong

School of Materials and Metallurgy; Northeastern University; Shenyang 110004

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CAI Zhaozhen ZHU Miaoyong. MICROSEGREGATION OF SOLUTE ELEMENTS IN SOLIDIFYING MUSHY ZONE OF STEEL AND ITS EFFECT ON LONGITUDINAL SURFACE CRACKS OF CONTINUOUS CASTING STRAND. Acta Metall Sin, 2009, 45(8): 949-955.

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Abstract

The solidification of molten steel in continuous casting mold is a complicated nonequilibrium process with high cooling rate of 10—100 ℃/s. At such a cooling rate, the segregation of the solute elements such as C, Si, Mn, P and S in brittle temperature range (Δθ_B) will vary with their initial contents and influence on the thermal strain significantly which could greatly increase the incidence of surface defects of strand. In this paper, a microsegregation model of solute elements in mushy zone with δ/γ transformation during solidification was established based on the regular hexagon transverse cross section of dendrite shape proposed by Ueshima by finite difference method under the non-equilibrium solidification condition at 10 ℃/s of cooling rate and the brittle temperaturerange Δθ_B was determined. The distribution characteristics of solute elements and the effect of their segregations on Δθ_B and thermal strin were nvestigatedTe results show that both P and S are the most serious segregation elements in final stage of solidification and affect on Δθ_B sinificantly together with carbon content in molten steel. The mechanism that increasing contents of P and S may incrasthe probability of longitudinal surface crack for continuous casting strand was presented by calculatng the change law of thermal strain with carbn content under different of P and S contents.

Key words: continuous casting microsegregation longitudinal surface cracks brittle temperature range thermal strain

Received: 15 January 2009

ZTFLH:

TG777

Fund:

Supported by Program for New century Excellent Talents in University (No. NCET–04–0285)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I8/949

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