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The smelting and rolling of hot rolled U75V rails with different contents of rare earth Ce are carried out in laboratory. The low temperature impacting property and fracture toughness of the rolled rail are compared and analyzed. The test results showed that the impact toughness of rail at room temperature could increase by about 30%, low temperature impacting property at -60 ℃ could increase by about 60% after add 0.005 6% rare earth Ce into hot rolled U75V rail; the average value of -20 ℃ KIC of rail increased by about 14% and the average value of -60 ℃ KIC of rail increased by about 15% so that the addition of rare earth Ce could further improve the low temperature toughness of hot rolled U75V rail.
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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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