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Effects of cooling rate and Al on MnS formation in medium-carbon non-quenched and tempered steels
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Effects of cooling rate and Al on MnS formation in medium-carbon non-quenched and tempered steels
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Journal Article
Effects of cooling rate and Al on MnS formation in medium-carbon non-quenched and tempered steels
2015
Overview
The effect of Al on the morphology of MnS in medium-carbon non-quenched and tempered steel was investigated at three different cooling rates of 0.24, 0.43, and 200°C·s^-1. The formation mechanisms of three types of MnS were elucidated based on phase diagram information combined with crystal growth models. The morphology of MnS is governed by the precipitation mode and the growth conditions. A monotectic reaction and subsequent fast solidification lead to globular Type I MnS. Type II MnS inclusions with different morphological characteristics form as a result of a eutectic reaction followed by the growth in the Fe matrix. Type III MnS presents a divorced eutectic morphology. At the cooling rate of 0.24°C·s^-1, the precipitation of dispersed Type III MnS is significantly enhanced by the addition of 0.044wt% acid-soluble Al（Als）, while Type II MnS clusters prefer to form in steels with either 0.034wt% or 0.052wt% Als. At the relatively higher cooling rates of 200°C·s^-1 and 0.43°C·s^-1, the formation of Type I and Type II MnS inclusions is promoted, and the influence of Al is negligible. The results of this work are expected to be employed in practice to improve the mechanical properties of non-quenched and tempered steels.
Publisher
University of Science and Technology Beijing,Springer Nature B.V,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China%School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China,State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
