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Outline
High-strength steels are widely employed due to their excellent combination of high strength, good ductility, and corrosion resistance. However, they often exhibit significant strain rate sensitivity. In this study, two types of high-strength steels, Ultrafort 401 and Ferrium S53 steels, were investigated. Tensile tests were conducted at varying strain rates (10−4−103 s−1), to obtain the yield strength, the tensile strength, the uniform elongation, the hardening index and other performance parameters. The variations of these parameters with strain rate were thoroughly analyzed. It was observed that under different strain rates, Ferrium S53 steel consistently outperformed Ultrafort 401 steel in terms of tensile properties, while they exhibited different trends. As the strain rate increased, both of the yield strength and the tensile strength of Ultrafort 401 steels increased, while for Ferrium S53 steels the yield strength of increased, and the tensile strength decreased and then increased. Combined with the microstructure analysis, it is found that the higher yield strength of Ferrium S53 steel was related to the smaller grain sizes, while the different tensile strength trends of the two high-strength steels with the increase of strain rate were associated with differences in strain hardening response. With the increase of strain rate, the dimple size of Ultrafort 401 steels increases, whereas it decreases and then increases for Ferrium S53 steels. This indicates a different pattern of change in the strain hardening level of the two high-strength steels with increasing strain rate. The findings in this work provide a scientific basis for assessing the mechanical performance of high-strength steels under various loading conditions and hold significant implications for their engineering applications.
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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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