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In this paper, the experimental study on heat treatment process of forging area at heel end of 60-50 kg/m U75V hot rolled compromise rail with different finish cooling temperatures and cooling rates is carried out as well as the tensile properties, hardness of top surface of the rail and cross section, microstructure and decarburized layer of forming section, transition section and heat affected zone of the compromise rail are analyzed. The results showed that the finish cooling temperatures of forming and transition sections of the compromise rail were controlled at about 650 ℃, cooling rate was controlled at 1.3~1.7 ℃/s, finish cooling temperature of heat affected zone was controlled below 550 ℃ and cooling rate was not less than 2 ℃/s, with which the problems of high hardness at forming and transition sections, low hardness at heat affected zone and width out of limits at softened zone of the compromise rail could be effectively solved.
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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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