稀土元素對耐候鋼元素偏析的影響

郭宏海; 宋波; 毛璟紅; 趙沛

doi:10.13374/j.issn1001-053x.2010.01.020

稀土元素對耐候鋼元素偏析的影響

doi: 10.13374/j.issn1001-053x.2010.01.020

1. 北京科技大學冶金與生態工程學院, 北京 100083;
2. 北京科技大學材料科學與工程學院, 北京 100083;
3. 中國鋼研科技集團有限公司, 北京 100081

基金項目:

國家重點基礎研究發展計劃資助項目（No.2004CB619107）

詳細信息

作者簡介:
郭宏海(1981-),男,博士研究生;宋波(1963-),男,教授,博士生導師,E-mail:songbo@metal.ustb.edu.cn

中圖分類號: TG142.7
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- 被引次數: 0
出版歷程
- 收稿日期: 2009-09-10

Effect of rare earth elements on macrosegregation in weather-resisting steel

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. China Iron&Steel Research Institute Group, Beijing 100081, China

摘要

摘要: 應用金屬原位統計分布分析技術(OPA)研究了耐候鋼鑄錠中C、P、S、Cu、Si和Mn的宏觀偏析規律,并分析了稀土元素對耐候鋼中元素偏析的影響.結果表明,在30%～40%等軸晶率,20℃過熱度下,元素C、S、P和Cu能產生嚴重的宏觀偏析,C、S呈中心正偏析,P、Cu呈中心負偏析并伴隨有反偏析,而Si和Mn的分布較為均勻.各個元素中心偏析位置完全相同.稀土元素在鋼中的固溶度為10-5～10-4,固溶稀土元素可以細化枝晶,提高等軸晶率.鋼中加入質量分數0.38%～0.55%的稀土元素可以有效改善C、S、P和Cu的宏觀偏析.
- 耐候鋼 /
- 稀土元素 /
- 宏觀偏析 /
- 固溶度
Abstract: The macrosegregation of C,P,S,Cu,Si and Mn in cast ingots of weather-resisting steel was studied by applying the technology of original position statistic distribution analysis(OPA),and the effect of rare earth elements(RE) on the macrosegregation in the steel was analyzed.The results showed that under the condition of the equiaxial crystal rate of 30% to 40% and the overheating temperature of 20 ℃ in the ingot,there was serious macrosegregation of C,S,P and Cu in the steel.C and S present center positive segregation,P and Cu the center negative segregation,and P and Cu the inverse segregation,while the solute distributions of Si and Mn were more uniform.The segregated zone of each element was of exactly the same.The solid solubility of RE in the steel were 10^-5 to 10^-4,and the soluted RE could refine dendrites and increase the equiaxial crystal rate.The macrosegregation of C,P,S and Cu was improved obviously by adding RE of 0.38% to 0.55% into the steel.
- weather-resisting steel /
- rare earth element /
- macrosegregation /
- solid solubility