Morphology, size and distribution of MnS inclusions in non-quenched and tempered steel during heat treatment
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第5期
论文作者：Xiao-jing Shao Xin-hua Wang Chen-xi Ji Hai-bo Li Yang Cui Guo-sen Zhu
文章页码：483 - 491
摘 要：This article reports the morphology, size, and distribution evolution of Mn S inclusions in non-quenched and tempered steel during heat treatment. The variation of single large-sized Mn S inclusions at high temperature was observed in situ using a confocal scanning laser microscope（CSLM）. The slender Mn S inclusions first changed to pearl-like strings. These small-sized pearls subsequently coalesced and became closer together as the temperature increased. Large-sized Mn S inclusions in non-quenched and tempered steel samples with different thermal histories were investigated with respect to the evolution of their morphology, size, and distribution. After 30 min of ovulation at 1573 K, the percentage of Mn S inclusions larger than 3 μm decreased from 50.5% to 3.0%. After a 3 h soaking period, Ostwald ripening occurred. Most Mn S inclusions moved from the grain boundaries to the interior. The present study demonstrates that heat treatment is an effective method of changing the morphology, size, and distribution of Mn S inclusions, especially large-sized ones.
Xiao-jing Shao1，Xin-hua Wang1,2，Chen-xi Ji1，Hai-bo Li1，Yang Cui1，Guo-sen Zhu1
1. Shougang Research Institute of Technology2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
摘 要：This article reports the morphology, size, and distribution evolution of Mn S inclusions in non-quenched and tempered steel during heat treatment. The variation of single large-sized Mn S inclusions at high temperature was observed in situ using a confocal scanning laser microscope（CSLM）. The slender Mn S inclusions first changed to pearl-like strings. These small-sized pearls subsequently coalesced and became closer together as the temperature increased. Large-sized Mn S inclusions in non-quenched and tempered steel samples with different thermal histories were investigated with respect to the evolution of their morphology, size, and distribution. After 30 min of ovulation at 1573 K, the percentage of Mn S inclusions larger than 3 μm decreased from 50.5% to 3.0%. After a 3 h soaking period, Ostwald ripening occurred. Most Mn S inclusions moved from the grain boundaries to the interior. The present study demonstrates that heat treatment is an effective method of changing the morphology, size, and distribution of Mn S inclusions, especially large-sized ones.
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