Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing Steel
The new generation of bearing steel has good comprehensive properties, which can satisfy most of the requirements of bearing steel in a complex environment. In the presented work, fatigue properties of 15Cr14Co12Mo5Ni2 bearing steel have been investigated by means of rotating bending fatigue tests o...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/1/25 |
| _version_ | 1827699294145085440 |
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| author | Zhiwei Wu Maosheng Yang Kunyu Zhao |
| author_facet | Zhiwei Wu Maosheng Yang Kunyu Zhao |
| author_sort | Zhiwei Wu |
| collection | DOAJ |
| description | The new generation of bearing steel has good comprehensive properties, which can satisfy most of the requirements of bearing steel in a complex environment. In the presented work, fatigue properties of 15Cr14Co12Mo5Ni2 bearing steel have been investigated by means of rotating bending fatigue tests on smooth bar specimens after carburization and heat treatment. Optical microscope, scanning electron microscopy, electron backscatter diffraction, and Image-Pro Plus software were used to analyze the fracture, microstructure, and carbides. The results suggest that the fatigue strength at room temperature and 500 °C is 1027 MPa and 585 MPa, respectively. Scanning electron micrographic observations on the fracture surface of the fatigue specimens at 500 °C show that fatigue cracks usually initiate from voids in the carburized case and oxide layer on the surface of steel. The failure mode in the carburized case is a quasi-cleavage fracture, and with the increase of crack propagation depth, the failure mode gradually changes to fatigue and creep-fatigue interaction. With the increase of the distance from the surface, the size of the martensite block decreases and the fracture surface shows great fluctuation. |
| first_indexed | 2024-03-10T13:46:51Z |
| format | Article |
| id | doaj.art-d14126fb14d4436e9a0e58b8581159d8 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T13:46:51Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-d14126fb14d4436e9a0e58b8581159d82023-11-21T02:35:19ZengMDPI AGMetals2075-47012020-12-011112510.3390/met11010025Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing SteelZhiwei Wu0Maosheng Yang1Kunyu Zhao2Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaResearch Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaThe new generation of bearing steel has good comprehensive properties, which can satisfy most of the requirements of bearing steel in a complex environment. In the presented work, fatigue properties of 15Cr14Co12Mo5Ni2 bearing steel have been investigated by means of rotating bending fatigue tests on smooth bar specimens after carburization and heat treatment. Optical microscope, scanning electron microscopy, electron backscatter diffraction, and Image-Pro Plus software were used to analyze the fracture, microstructure, and carbides. The results suggest that the fatigue strength at room temperature and 500 °C is 1027 MPa and 585 MPa, respectively. Scanning electron micrographic observations on the fracture surface of the fatigue specimens at 500 °C show that fatigue cracks usually initiate from voids in the carburized case and oxide layer on the surface of steel. The failure mode in the carburized case is a quasi-cleavage fracture, and with the increase of crack propagation depth, the failure mode gradually changes to fatigue and creep-fatigue interaction. With the increase of the distance from the surface, the size of the martensite block decreases and the fracture surface shows great fluctuation.https://www.mdpi.com/2075-4701/11/1/25new-generation bearing steelrotating bending fatiguehigh temperaturecrack initiationcrack propagation |
| spellingShingle | Zhiwei Wu Maosheng Yang Kunyu Zhao Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing Steel Metals new-generation bearing steel rotating bending fatigue high temperature crack initiation crack propagation |
| title | Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing Steel |
| title_full | Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing Steel |
| title_fullStr | Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing Steel |
| title_full_unstemmed | Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing Steel |
| title_short | Fatigue Crack Initiation and Propagation at High Temperature of New-Generation Bearing Steel |
| title_sort | fatigue crack initiation and propagation at high temperature of new generation bearing steel |
| topic | new-generation bearing steel rotating bending fatigue high temperature crack initiation crack propagation |
| url | https://www.mdpi.com/2075-4701/11/1/25 |
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