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In this paper, the effects of adding rare earth into A572.Gr65 steel on its inclusions, microstructure and properties were studied with industrial experiments. The results showed that the inclusions in steel were mainly Al2O3 and Al2O3-CaO before add the rare earth and the size was about 5 μm as well as the inclusions were changed to spherical RE2O2S with the size less than 2 μm after add the rare earth. The thermodynamic and dynamics calculations showed that RE2O2S was the most easily formed inclusion in steel after add rare earth as well as the diffusion rate of RE3+ and Al3+ in the intermediate layer of RE2O2S·Al2O3 was the restrictive link of modified rare earth inclusions. After add the rare earth, the microstructure of hot rolled plate was refined as well as the impact and tensile properties were increased with the increase of rare earth content.
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| 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 |
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