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The safety performance of a newly developed microalloyed 1.8 GPa hot stamped steel brand and the traditional brand was evaluated from material to part level. The results show that microalloyed 1.8 GPa hot stamped steel has more obvious safety advantages than ordinary steel based on 3 key factors: microstructure refinement, second phase precipitation and retained austenite. The dynamic fracture models of the two materials were established. The microalloyed steel has a higher ultimate fracture strain under the same stress state, showing a stronger fracture resistance. Drop weight impact tests were carried out on 2 kinds of 1.8 GPa hot stamped and 1.5 GPa high-strength steel door anti-collision beams. The micro alloy steel 1.8 GPa hot stamped door anti-collision beam has better anti-collision intrusion and collision energy absorption properties.
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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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