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Outline
The rotating bending fatigue behavior of 9310 steel by vacuum carburization heat treatment is studied， the microstructure and fracture morphology are analyzed. The hardness gradient， surface roughness， residual stress distribution， and inclusion size in the carburized layer are characterized. Based on the Murakami three-dimensional defect model， a fatigue limit prediction method coupling carburized layer hardness， residual stress， inclusion size， and surface roughness is established， thereby revealing effective approaches to enhance the fatigue performance of vacuum carburized specimens. The results show that after vacuum carburizing heat treatment， the carburized layers of specimens tempered at 150 ℃ and 180 ℃ exhibit a dispersed distribution of carbides and uniform， fine martensite， with no oxidation or decarburization on the surface. Cracks mainly originate from non-metallic inclusions. Among them， the specimen tempered at 150 ℃ possesses a higher surface hardness of 755HV， an effective hardened layer depth （d） of 1.20 mm， and a peak residual compressive stress of 465 MPa. Cracks primarily initiate from non-metallic inclusions. The predicted fatigue limits for specimens tempered at 150 ℃ and 180 ℃ are 1275 MPa and 1260 MPa， respectively， which deviate from the measured values（1282 MPa and 1242 MPa） by only 0.5% and 1.4%， indicating that this prediction method exhibits excellent applicability to carburized steel materials. The effective approaches to improve the fatigue performance of vacuum carburized specimens include reducing inclusion size， increasing carburized layer hardness and residual compressive stress， and lowering surface roughness.
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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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