| Microstructure evolution in grey cast iron during directional solidification |
| |
| 作者姓名： | Xian-fei Ding Xiao-zheng Li Qiang Feng Warkentin Matthias Shi-yao Huang |
| |
| 作者单位： | National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China |
| |
| 基金项目： | The fi-nancial support provided by Ford Motor Company (Univer-sity Research Program) is also acknowledged |
| |
| 摘 要： | The solidification characteristics and microstructure evolution in grey cast iron were investigated through Jmat-Pro simulations and quenching performed during directional solidification. The phase transition sequence of grey cast iron was determined as L → L + γ → L +γ + G → γ + G → P (α + Fe3C) + α + G. The graphite can be formed in three ways:directly nucleated from liquid through the eutectic reaction (L → γ + G), independently precipitated from the oversaturated γ phase (γ → γ + G), and produced via the eutectoid transformation (γ → G + α). The area fraction and length of graphite as well as the primary dendrite spacing decrease with increasing cooling rate. Type-A graphite is formed at a low cooling rate, whereas a high cooling rate results in the precipitation of type-D graphite. After analyzing the graphite precipitation in the as-cast and transition regions separately solidified with and without inoculation, we concluded that, induced by the inoculant addition, the location of graphite precipitation changes from mainly the γ interdendritic region to the entire γ matrix. It suggests that inoculation mainly acts on graphite precipitation in the γ matrix, not in the liquid or at the solid-liquid front.
|
| 关 键 词： | directional solidification grey cast iron phase transition graphite |
Microstructure evolution in grey cast iron during directional solidification |
| |
| Xian-fei Ding,Xiao-zheng Li,Qiang Feng,Warkentin Matthias,Shi-yao Huang.Microstructure evolution in grey cast iron during directional solidification[J].International Journal of Minerals,Metallurgy and Materials,2017,24(8):884-890. |
| |
| Authors: | Xian-fei Ding Xiao-zheng Li Qiang Feng Warkentin Matthias Shi-yao Huang |
| |
| Affiliation: | 1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;Beijing Key Laboratory of Special Melting and Preparation of High-end Metal, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;3. Beijing Key Laboratory of Special Melting and Preparation of High-end Metal, University of Science and Technology Beijing, Beijing 100083, China;State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China;4. Ford Research & Advanced Engineering Europe, AA-FFA-1,Süsterfeldstr. 200 Aachen, 52072, Germany;5. Materials and Process Research, Ford Motor Research and Engineering Center, Nanjing 211100, China |
| |
| Abstract: | The solidification characteristics and microstructure evolution in grey cast iron were investigated through Jmat-Pro simulations and quenching performed during directional solidification. The phase transition sequence of grey cast iron was determined as L→ L +γ→ L +γ + G→γ + G→ P (α + Fe3C) +α + G. The graphite can be formed in three ways: directly nucleated from liquid through the eutectic reac-tion (L→γ + G), independently precipitated from the oversaturatedγ phase (γ→γ + G), and produced via the eutectoid transformation (γ→ G +α). The area fraction and length of graphite as well as the primary dendrite spacing decrease with increasing cooling rate. Type-A graphite is formed at a low cooling rate, whereas a high cooling rate results in the precipitation of type-D graphite. After analyzing the gra-phite precipitation in the as-cast and transition regions separately solidified with and without inoculation, we concluded that, induced by the inoculant addition, the location of graphite precipitation changes from mainly theγ interdendritic region to the entireγ matrix. It suggests that inoculation mainly acts on graphite precipitation in theγ matrix, not in the liquid or at the solid–liquid front. |
| |
| Keywords: | directional solidification grey cast iron phase transition graphite |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
|
点击此处可从《矿物冶金与材料学报》下载全文 |
|
