钢凝固两相区溶质元素的微观偏析及其对连铸坯表面纵裂纹的影响

金属学报

2009, Vol. 45

Issue (8): 949-955

论文

本期目录 | 过刊浏览

钢凝固两相区溶质元素的微观偏析及其对连铸坯表面纵裂纹的影响

蔡兆镇;朱苗勇

东北大学材料与冶金学院; 沈阳 110004

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

引用本文:

蔡兆镇朱苗勇 . 钢凝固两相区溶质元素的微观偏析及其对连铸坯表面纵裂纹的影响[J]. 金属学报, 2009, 45(8): 949-955.
, . MICROSEGREGATION OF SOLUTE ELEMENTS IN SOLIDIFYING MUSHY ZONE OF STEEL AND ITS EFFECT ON LONGITUDINAL SURFACE CRACKS OF CONTINUOUS CASTING STRAND[J]. Acta Metall Sin, 2009, 45(8): 949-955.

全文: PDF(1522 KB)

摘要:

以Ueshima的正六边形横断面枝晶模型为原型, 采用有限差分方法建立了钢凝固过程伴随δ/γ相变的两相区溶质微观偏析模型, 确立了在冷却速率为10 ℃/s非平衡凝固条件下钢的脆性温度区间, 研究分析了各溶质元素在该温度区内的偏析特点及对脆性温度区间Δθ_B与热应变的影响规律, 定量计算了不同P, S含量下脆性温度区热应变随C含量的变化规律, 揭示了P, S含量的增加使连铸坯出现表面纵裂纹几率提高的机理.

关键词 ：连铸, 微观偏析, 表面纵裂纹, 脆性温度区, 热应变

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

收稿日期: 2009-01-15

ZTFLH:

TG777

基金资助:

新世纪优秀人才支持计划资助项目NCET--04--0285

作者简介: 蔡兆镇, 男, 1982年生, 博士生

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