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Taking 220 MPa grade ultra-low carbon bake-hardening steels as the research object, this paper compares and aralyzes test steel with Nb single-addition (H220BD-1) and Nb+Ti dual-addition (H220BD-2) systems. Through solid solution carbon calculations and internal friction method determination,the paper explores the influence of solid solution carbon on aging behavior under different composition systems, and combines with microstructure griain size characterization to elucidate the correlation mechanism between grain dimensions and Bake-Hardening (BH) value with aging resistance. Results demonstrate that Ti addition significantly reduces solid solution carbon content, effectively suppressing dynamic carbon segregation during aging. The dual-addition system achieves grain refinement, enhancing strength via Hall-Petch effect while improving aging stability.
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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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