Evolution of Al2O3 inclusions by cerium treatment in low carbon high manganese steel

IF 3.1 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-09-01 DOI:10.1016/S1006-706X(17)30135-8

Hao Li , Yan-chong Yu , Xiang Ren , Shao-hua Zhang , She-bin Wang

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引用次数: 41

Abstract

The influence of cerium (Ce) treatment on the morphologies, size and distributions of Al₂O₃ inclusions in low carbon high manganese steel was investigated by OM, SEM-EDS and theoretical calculation. The results showed that Ce can modify the morphologies and types of Al₂O₃ inclusions. After Ce treatment, the irregular Al₂O₃ inclusions were replaced by smaller and dispersive spherical cerium oxysulfides. The effects of treatment time and Ce content on the evolution of Al₂O₃ inclusions were examined. It indicated that Al₂O₃ inclusions were wrapped by rare earth inclusions to form a ring like shape Ce-enriched band around the inclusions. Model was established to elucidate the evolution mechanism of Al₂O₃ inclusions. Evolution kinetics of inclusions was discussed qualitatively to analyze the velocity controlled step. It was found that diffusion of Ce³⁺ and Al³⁺ in solid inclusion core and the formed intermediate layer would be the limited step during the evolution process.

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低碳高锰钢中铈处理Al2O3夹杂物的演变

采用OM、SEM-EDS和理论计算研究了铈(Ce)处理对低碳高锰钢中Al2O3夹杂物形貌、尺寸和分布的影响。结果表明，Ce能改变Al2O3夹杂物的形态和类型。Ce处理后，不规则的Al2O3夹杂物被更小、更分散的球形氧化硫化铈所取代。考察了处理时间和Ce含量对Al2O3夹杂物演化的影响。结果表明，Al2O3包裹体被稀土包裹体包裹，在包裹体周围形成环状富ce带。通过建立模型来阐明Al2O3夹杂物的演化机理。定性讨论了夹杂物的演化动力学，分析了速度控制步骤。结果表明，Ce3+和Al3+在固体包裹体核心及形成的中间层中的扩散是其演化过程中的限制步骤。

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