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In the process of developing high quality steel, rare earth elements are widely used and effects are significant. In this paper, the mechanisms of action and lack of research of rare earth elements in steel are summarized as well as application situations of rare earth elements in wear-resistant steel, H beam and corrosion-resistant steel are overviewed. The design thinking of determining additive amount of rare earth by scie.pngically applying the first principle of density functional theory and combining mismatch theory with thermodynamic calculations is proposed aiming at such problems as lack of researches for the theory of determining additive amount of rare earth as well as solid solution of rare earth and mechanisms of action of the rare earth at grain boundary in steel, which could provide the thinking and references for design and wide applications of rare earth steel alloy.
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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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