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The occurrence state and change rules of stock for rare earth in high carbon medium manganese steel as well as effects of rare earth on sulfide inclusions, oxide inclusions, microstructure, hardening efficiency of static compression and impact wear property are systematically studied through metallographic observation, 30% static compression, impact wear test and theoretical analysis. The study results showed that the content of solid solution rare earth for high carbon medium manganese steel could not be increased by adding a large amount of rare earth and it remained below 0.003 5%. The hardening efficiency of 30% static compression at room temperature for high carbon medium manganese steel is improved by adding rare earth, which is increased from 63.25% without rare earth to 78.57% ~88.37% with rare earth. The impact wear resistance of high carbon medium manganese steel is improved. The relative wear resistance is increased by 1.010 0~1.893 0 times with impact load of 2 J and it is increased by 1.391 3~1.822 8 times with impact load of 5 J. The optimal amount of rare earth added into high carbon medium manganese steel is 0.20%~0.25% under the experimental conditions.
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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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