Chemical composition and structural identification of primary carbides in as-cast H13 steel

论文摘要

The aim of this study was to characterize the primary carbides formed in as-cast H13 steel. The composition, morphology, type, and size of primary carbides in as-cast H13 steel were investigated by optical microscope（OM）, field emission scanning electron microscopy（FE-SEM）, electron back-scattered diffraction（EBSD）, and X-ray diffraction（XRD） analysis. The number of primary carbides was investigated by ASPEX automated inclusion analysis system. The results indicated that primary carbides in as-cast H13 steel are mainly composed of Cr, Mo, V, and Ti, and there exist four kinds of primary carbides in the interdendritic zones of H13 steel, which are stripy Mo–Cr-rich M2C, eutectic Mo–Cr-rich M2C, V-rich MC, and V-rich MC with Ti and N. Thermodynamic calculation indicated that M2C precipitates in liquid phase at solid fractions larger than 0.99, while MC precipitates in liquid phase at solid fractions larger than 0.96. Statistical results indicated that the number of M2C is much greater than the number of other kinds of primary carbides. Most primary carbides are blocky, with lengths of no more than 10 μm and a length/width ratio of no more than 3. The large primary carbides in as-cast H13 steel are mainly M2C.

论文目录

• 1. Introduction
• 2. Experimental
•   2.1. H13 as-cast ingot
•   2.2. Microstructural characterization
•   2.3. Extraction and analysis of primary carbide
• 3. Results and discussion
•   3.1. Microstructure of as-cast H13 steel
•   3.2. Composition and morphology of primary carbides
•   3.3. Identification of types of primary carbides
•   3.4. Thermodynamic calculation of primary carbides
•   3.5. Statistical analysis of primary carbides
• 4. Conclusions

文章来源

类型: 期刊论文

作者: Ming-tao Mao,Han-jie Guo,Fei Wang,Xiao-lin Sun

来源: International Journal of Minerals Metallurgy and Materials 2019年07期

年度: 2019

分类: 工程科技Ⅱ辑,工程科技Ⅰ辑

专业: 金属学及金属工艺

单位: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials,Central Iron & Steel Research Institute

基金: financially supported by the National Natural Science Foundation of China (Nos. U1560203 and 51274031),the Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials at School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,China

分类号: TG115;TG142.1

页码: 839-848

总页数: 10

文件大小: 12136K

下载量: 17