Full
Outline
Taking S355J2G4 locomotive steel produced by Ansteel ASP 2150 production line as the research object, the strength and toughness of the S355J2G4 locomotive steel were simultaneously improved through compositon design, thermomechanical control process. The law of organizational evolution was analyzed by using EBSD and other methods, and the relationship between microstructure and properties was revealed. The results showed that the final rolling temperature was 860 ℃, and the coiling temperature was reduced from 600 ℃ to 550 ℃, the microstructure changed from ferrite and pearlite to ferrite and bainite. The yield strength was increased by 31 MPa, the tensile strength was increased by 27 MPa, the elongation was decreased by 4.5%, and the impact energy at -40 ℃ was decreased by 96 J. The coiling temperature was 600 ℃, and the final rolling temperature was reduced from 880 ℃ to 860 ℃ with the microstructure composed of ferrite and pearlite. The yield strength was increased by 32 MPa, and the tensile strength was increased by 14 MPa. The elongation was increased by 1.5%, and the impact energy at -40 ℃ was increased by 18 J, realizing synchronous improvement of strength and toughness. The optimal production process for S355J2G4 was a final rolling temperature of 860 ℃ and a coiling temperature of 600 ℃, which provided reliable data support for the matching of the entire process involved in the actual production of hot-rolled strip steel products models in the field of metal materials.
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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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