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| IN SITU OBSERVATION OF MnS INCLUSION BEHAVIOR IN RESULFURIZED FREE-CUTTING STEEL DURING HEATING |
| SHAO Xiaojing, WANG Xinhua, JIANG Min, WANG Wanjun, HUANG Fuxiang, JI Yunqing |
| School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083 |
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Cite this article:
SHAO Xiaojing WANG Xinhua JIANG Min WANG Wanjun HUANG Fuxiang JI Yunqing. IN SITU OBSERVATION OF MnS INCLUSION BEHAVIOR IN RESULFURIZED FREE-CUTTING STEEL DURING HEATING. Acta Metall Sin, 2011, 47(9): 1210-1215.
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Abstract MnS is a common type of non-metallic inclusions in steel, which is of good deformability during rolling. As elongated MnS inclusions in rolling direction often cause poor mechanical property of steel. However, MnS is indispensable in resulfurized free-cutting steel. In order to improve mechanical property, especially cutting property of free-cutting steel, the good control of shape and size of MnS is important. In this study, confocal scanning laser microscope was used firstly to observe the morphology evolution of large-sized slender MnS during heating. The effect of heating rate was also considered. The results indicated that for morphology evolution of MnS, the shrink occurred in longitudinal direction, whereas expansion and contraction happened in radial direction, which finally caused the split of slender MnS. When samples were heated at the rate between 0.5-2℃/s, the split degree of MnS decreased with the increase of heating rate. When the heating rate was in the range of 6-10℃/s, the splitting behavior of MnS could not occur.
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Received: 31 March 2011
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