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Incoloy 800H is used for high temperature section of heat transfer tubes of the first high temperature gas-cooled reactor nuclear power unit in China, of which the highest design temperature is 675 ℃. The steam oxidation properties of the Incoloy 800H at the design temperature are investigated. The structure of oxide scale of the Incoloy 800H is characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray energy dispersive spectroscopy (EDS). The results show that, the oxidation kinetic curve of the 800H alloy in steam at 675 ℃ is close to the cubic law, namely the cubic of the weight gain is nearly proportional to the oxidation time. The oxide scale has a double-layer structure. The outer layer is mainly composed of Fe3O4, Fe2O3 and a small amount of Ni, and the inner layer is Cr2O3 nanocrystalline with a small amount of Ni, Al2O3 and TiO2 particles distributed in it. Some internal oxide particles of Cr2O3, Al2O3 and TiO2 are distributed in the matrix metal adjacent to the oxide layer.
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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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