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Outline
A 316L-Al2O3 coating with an introduction of Si was prepared on the surface of 40Cr steel bar by ultra-high-speed laser cladding. Effects of Si on the microstructure, microhardness, wear resistance and corrosion resistance of the coating were investigated by means of optical microscope, scanning electron microscope, microhardness tester, friction and wear testers, electrochemical workstation among others. The results show that the 316L-Al2O3 coating is mainly composed of austenite and Al2O3. And an addition of Si refines the grain size and also leads to the generation of FeSi intermetallic compounds in the coating, which increases the coating hardness by 18.97%. It is found that the Si-containing 316L-Al2O3 coating exhibits improved wear resistance and corrosion resistance, and its wear volume and self-corrosion current density are 19.1 × 10-3 mm3 and 6.93 × 10-8 A/cm2, respectively.
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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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