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Outline
In light of the application scenarios where the combustion chamber and turbine components of aeroengines are repeatedly subjected to short-term overheating， and reusable spacecraft endure cyclic high-temperature conditions， an experimental study is conducted to investigate the effects of cyclic overheating on the tensile properties of GH3230 alloy. Additionally， the oxidation-related microstructural and compositional changes are characterized.The results reveal that the cracking of internal oxides during plastic deformation reduces the actual load-bearing area of the oxidized sample. Grain coarsening also occurs during thermal exposure. These two factors jointly contribute to a continuous decline in room-temperature tensile strength as the number of overheating cycles increases. After removing the surface layer， the tensile strength is restored to a certain degree. The oxidative decarburization zone that forms near the sample surfaces exhibits improved plastic deformability. As a result， it effectively blunts oxide cracks and prevents them from penetrating into the matrix. Consequently， the tensile elongation of the oxidized sample after 10-40 cycles of over-temperature remains at relatively high levels due to the avoidance of the notch effect caused by surface cracks.
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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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