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In this paper, a systematic study of niobium-vanadium composite microalloyed aluminum-silicon coated hot-forming steel 34MnB5NbV is carried out by various material mechanical property tests and microstructure characterization methods, such as room temperature tensile test, three-point bending test, scanning electron microscope, and transmission electron microscope. The results show that after quenching, the yield strength of the material is 1 365 MPa, the tensile strength is 2 056 MPa, the elongation is 4.9%, and the bending angle is 58.7°. After bake hardening process, the yield strength of the material is increased by 127 MPa, the tensile strength is decreased by 144 MPa, the elongation is increased by 0.5%, and the bending angle is increased by 6.1°. After niobium-vanadium composite microalloyed 34MnB5NbV steel hot forming, the precipitation phase is (Nb, V) C composite precipitated phase, which has better fine grain strengthening and precipitation strengthening effect to improve the strength and toughness of the hot forming steel, so that the comprehensive mechanical properties achieve better. Moreover, in order to fully evaluate the bending toughness of the material, the three-point bending test is carried out on the door anti-collision beam part made by 34MnB5NbV steel. The maximum bending force and bending energy of the part showed significant improvements compared to those of the 1 500 MPa part, indicating good bending toughness and meeting the application requirements.
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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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