Study on the modification of inclusions by Ca treatment in GCr18Mo bearing steel
| Autor: | Meng-Ran Qiao, Li-Bin Qin, Hong-Yan Zheng, Shu-Qiang Guo, Zhongming Ren, Xiu-Jing Zou |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0209 industrial biotechnology
Materials science Bearing (mechanical) Polymers and Plastics Kinetic model Mechanical Engineering Analytical chemistry Deoxidization chemistry.chemical_element Liquid phase 02 engineering and technology Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering chemistry Mechanics of Materials Aluminium law Calcium aluminates Oxygen content |
| Zdroj: | Advances in Manufacturing. 7:438-447 |
| ISSN: | 2195-3597 2095-3127 |
| Popis: | The effect of Ca treatment on the modification of inclusions in Al-killed GCr18Mo bearing steel was studied and a thermodynamic and kinetic model was established. The experimental results showed that oxygen content in the steel could be reduced from 120 μg/g to the range 5.5–21.6 μg/g by Al-Ca complex deoxidization at 1 873 K. An appropriate increase in Ca/Al mass ratio is beneficial to reduce the total oxygen content in steel. When the content of dissolved aluminum was in the range of 0.03%–0.3%, with the increase of Ca/Al mass ratio from 0.8–1.6 to 2.4–3.2, the number of inclusions per unit area significantly reduced. In addition, the main types of inclusions were modified from large-sized Al2O3 clusters to plastic or semi-plastic liquid phase calcium aluminates. The experimental results matched well with the thermodynamic analysis. |
| Databáze: | OpenAIRE |
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