Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloy
The three-point bending fatigue method was used to determine the <i>S-N</i> fatigue curves of smooth specimens and straight-notched specimens to study the fatigue properties of Stellite12 cobalt-based alloy, and the fatigue fracture processes of the cobalt-based alloy were investigated b...
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| Format: | Article |
| Language: | zho |
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Journal of Materials Engineering
2021-01-01
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| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000076 |
| _version_ | 1797972428070060032 |
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| author | MIAO Wen-juan CAO Rui CHE Hong-yan DONG Hao CHEN Jian-hong |
| author_facet | MIAO Wen-juan CAO Rui CHE Hong-yan DONG Hao CHEN Jian-hong |
| author_sort | MIAO Wen-juan |
| collection | DOAJ |
| description | The three-point bending fatigue method was used to determine the <i>S-N</i> fatigue curves of smooth specimens and straight-notched specimens to study the fatigue properties of Stellite12 cobalt-based alloy, and the fatigue fracture processes of the cobalt-based alloy were investigated by the observation of fracture morphology.The results show that the fatigue limit of the smooth specimen is 545 MPa, which is about 25.4% of the original bending strength of 1552 MPa. The fatigue limit of the straight-notched specimen is about 101 MPa, which is about 19.1% of static bending strength of 517.6 MPa. The fatigue sensitivity of smooth specimens and straight-notched specimens is 397 and 31, respectively. In addition, it is found that the fatigue cracks can initiate in the carbides aggregated regions in the near surface. Surface defects can also induce the initiation of fatigue cracks. The transgranular fracture of the carbides dominates in the crack propagation. The cobalt base metal presents a lot of tearing ridges under the condition of stress ratio <i>R</i>=0.1, but it also shows a certain degree brittle fracture mode, so the fatigue crack propagation mode is a mixed mode of true fatigue and static fatigue. |
| first_indexed | 2024-04-11T03:47:12Z |
| format | Article |
| id | doaj.art-18741cb3cb3c43d2a03a57f05a639b27 |
| institution | Directory Open Access Journal |
| issn | 1001-4381 1001-4381 |
| language | zho |
| last_indexed | 2024-04-11T03:47:12Z |
| publishDate | 2021-01-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj.art-18741cb3cb3c43d2a03a57f05a639b272023-01-02T02:24:28ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43811001-43812021-01-0149115315910.11868/j.issn.1001-4381.2020.00007620210118Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloyMIAO Wen-juan0CAO Rui1CHE Hong-yan2DONG Hao3CHEN Jian-hong4State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaAdvanced Technology&Materials Co., Ltd., China Iron&Steel Research Institute Group, Beijing 100081, ChinaAdvanced Technology&Materials Co., Ltd., China Iron&Steel Research Institute Group, Beijing 100081, ChinaState Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, ChinaThe three-point bending fatigue method was used to determine the <i>S-N</i> fatigue curves of smooth specimens and straight-notched specimens to study the fatigue properties of Stellite12 cobalt-based alloy, and the fatigue fracture processes of the cobalt-based alloy were investigated by the observation of fracture morphology.The results show that the fatigue limit of the smooth specimen is 545 MPa, which is about 25.4% of the original bending strength of 1552 MPa. The fatigue limit of the straight-notched specimen is about 101 MPa, which is about 19.1% of static bending strength of 517.6 MPa. The fatigue sensitivity of smooth specimens and straight-notched specimens is 397 and 31, respectively. In addition, it is found that the fatigue cracks can initiate in the carbides aggregated regions in the near surface. Surface defects can also induce the initiation of fatigue cracks. The transgranular fracture of the carbides dominates in the crack propagation. The cobalt base metal presents a lot of tearing ridges under the condition of stress ratio <i>R</i>=0.1, but it also shows a certain degree brittle fracture mode, so the fatigue crack propagation mode is a mixed mode of true fatigue and static fatigue.http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000076three-point bending fatiguecobalt-based alloyfatigue fracturefracture mode |
| spellingShingle | MIAO Wen-juan CAO Rui CHE Hong-yan DONG Hao CHEN Jian-hong Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloy Cailiao gongcheng three-point bending fatigue cobalt-based alloy fatigue fracture fracture mode |
| title | Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloy |
| title_full | Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloy |
| title_fullStr | Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloy |
| title_full_unstemmed | Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloy |
| title_short | Fatigue properties and fracture mechanism of Stellite12 cobalt-based alloy |
| title_sort | fatigue properties and fracture mechanism of stellite12 cobalt based alloy |
| topic | three-point bending fatigue cobalt-based alloy fatigue fracture fracture mode |
| url | http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000076 |
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