The Ce-Fe alloy is added at the stage of RH in the process of smelting IF steel to improve the overall performances of automobile sheet steel through industrial tests. The industrial sampling was carried out for the test results so that the type, size and microstructure of rare earth inclusions in the entire process of smelting were systematically analyzed with the SEM-EDS electron microscope, ASPEX automatic scanning of inclusions, X-ray diffraction(XRD) and thermodynamic calculation. The results showed that such inclusions as Al2O3 and MnS could be modified with rare earth Ce from RH to slab and rolled products so that such rare earth inclusions as Ce2O3, Ce2O2S and CeO2 were preferentially formed, rare earth inclusions were gradually transformed from Al-O-Ce to such inclusions as Al-O-Ce, Ce-O-S and Al-O-Ce-S as well as the shape tended to be spherical and ellipsoidal and the size was below 5 μm.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |