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Outline
There is cracking on the high strength IF steel HC220Y with phosphorus when wheel cover of automobile is stamped. It is found that there are more MnS inclusions in the steel and a large number of MnS inclusions with long strip shape distributed along rolling direction become the source of cracks by detecting the chemical composition, metallographic structure and inclusions with metallographic microscope as well as analyzing the microstructure and fracture with scanning electron microscope so that the formability of steel plate is reduced and there are cracks on parts of wheel cover of automobile in the stamping process. The problem of cracking is solved by improving the purity of molten steel, reducing content of S in steel as well as strictly controlling amount and form of sulfide inclusions in steel.
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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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