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| Effect of heat treatment on oxide inclusion in Si-killed 304 stainless steel |
| ZHANG Xue-liang1，YANG Shu-feng1，LI Jing-she1，ZHAI Jun2 |
（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China
2. Technology Center， Shanxi Taigang Stainless Steel Co.， Ltd.，Taiyuan 030003， Shanxi， China） |
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Abstract To clarify the effect of heat treatment on the characteristics of inclusions in solid steel， the Si-killed 304 stainless steel was heat-treated at 1 250 ℃ in a resistance furnace. The morphology， size and composition of the oxide inclusions in the samples before and after heat treatment were analyzed by scanning electron microscopy. The experimental results show that the inclusions are mainly spherical single-phase CaO-SiO2-Al2O3-MnO-（Cr2O3） before heat treatment. Mean while，a small amount of MnS is also observed at the edges of some oxide inclusions. After heat treatment at 1 250 ℃ for 1 h， angular MnO-Al2O3-Cr2O3 phase precipitates on the surface of partial oxide inclusions with dimensions less than 4 μm. With the heat-treatment time increasing to 2.5 h， the oxide inclusion size of MnO-Al2O3-Cr2O3 phase observed increases. Meanwhile， the MnO-Al2O3-Cr2O3 phase gradually grows into the center of the oxide inclusions. In addition， for the oxide inclusions existed still as single-phase CaO-SiO2-Al2O3-MnO-（Cr2O3） after heat treatment， the contents of CaO and MnO components in the oxide inclusions are reduced and increased， respectively. However， there is no obvious change in the contents of the Cr2O3，SiO2 and Al2O3 components in the oxide inclusions.
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Received: 06 September 2017
Published: 11 May 2018
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2018, Vol. 53 
