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The effect of residual stress for rail on its fatigue performance is great. In this paper, the influences of different residual stress values on fatigue crack growth rate for U75V heat-treated rail are studied with tempering test and metallographic analysis method. The influences of different tempering times on the residual tension of rail are analyzed with the tempering test. It is concluded that the residual stress gradually decreases with increase of tempering time; the crack growth path at tip of fatigue crack is analyzed by testing the metallographic structure of rail treated with tempering process and observing the metallographic structure of rail with different tempering times, the influences of different tempering times on fatigue crack growth rate are analyzed according to the mode and length of crack growth; the residual stress and fatigue crack growth rate of rail can be effectively reduced so that the anti-fatigue performance of rail can be improved through tempering process control.
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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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