摘要
为阐明热处理对固态钢中夹杂物特性的影响,利用电阻炉对硅脱氧304不锈钢在1 250℃下进行了热处理,并使用扫描电子显微镜分析了热处理前后试样内氧化物夹杂的形貌、尺寸和成分等特性变化。试验结果表明,热处理前,试样内夹杂物主要为球形的单相CaO-SiO2-Al2O3-MnO-（Cr2O3）,部分夹杂物边缘伴有少量Mn S。在1 250℃下热处理1 h后,部分尺寸小于4μm的夹杂物表面析出棱角状的MnO-Al2O3-Cr2O3相。随着热处理时间增加至2.5 h,能够析出MnO-Al2O3-Cr2O3相的夹杂物尺寸增加,且新析出相在夹杂物表面逐渐长大。对于热处理后仍以单相CaO-SiO2-Al2O3-MnO-（Cr2O3）形式存在的夹杂物,CaO组元减少,MnO组元增加,Cr2O3,SiO2和Al2O3组元无明显变化。
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 Mn S 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.
作者
张雪良
杨树峰
李京社
翟俊
ZHANG Xue-liang;YANG Shu-feng;LI Jing-she;ZHAI Jun(School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;Technology Center, Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030003, Shanxi, China)
出处
《钢铁》
CAS
CSCD
北大核心
2018年第5期32-38,共7页
Iron and Steel
基金
国家自然科学基金资助项目(51574020,51674023)
关键词
硅脱氧304不锈钢
热处理
氧化物夹杂
成分变化
Si-killed 304 stainless steel
heat treatment
oxide inclusion
composition change
