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Based on the fracture analysis of the screw spring fracture in durability test, the paper determined that the fracture originated from the surface decarburization layer and further analyzed the harmfulness of the surface decarburization layer on the spring life from the perspective of surface microstructure and fatigue crack initiation, the paper concluded that the surface decarburization was the main cause for the early spring fracture. The problem of surface decarburization was solved by improving the heat treatment technology of spiral spring. The durability test of the improved spiral spring was carried out again. The life of the improved spiral spring was greatly improved, the durability test number was increased from failing to meet the technical requirements before the improvement to exceeding 2 times of the technical requirements before the improvement without breaking.
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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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