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This article studied laser welding of the coating-free press hardened steels (CFPHS) with low carbon footprint and laser welding of aluminum-silicon coating press hardened steels (CFPHS). The study shows that both CFPHS-to-CFPHS and CFPHS-to-AlSi-coated PHS do not require filler wire and laser ablation. Both weldments demonstrate good tensile ductility, with fracture occurring away from the weld seam. Besides, CFPHS-to-AlSi-coated PHS shows high Charpy V-notch impact toughness of 86% of bulk metal. Furthermore, microstructure analysis was conducted on CFPHS-to-AlSi-coated PHS: Microstructure of weld zone is mainly martensite with very small amount of ferrite, consistent with the hardness being as high as bulk metal. Finally, thermodynamics and phase transformation kinetics were used to study the weld seam between CFPHS and AlSi-coated PHS: (1) CFPHS reduces the Al and Si content from coating contamination during weld fusion, avoiding or reducing the formation of brittle AlSi-rich ferrite at high temperatures; (2) Cr alloying improves the hardenability of the weld seam, thus full martensitic microstructure can be obtained during die quenching of hot forming, which guarantees the high hardness of the weld seam.
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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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