| Crack propagation mechanisms of AISI 4340 steels with different strength and toughness | |
| Li, H. F.1,2; Wang, S. G.1; Zhang, P.1; Qu, R. T.1; Zhang, Z. F.1,2 | |
| Corresponding Author | Zhang, P.(pengzhang@imr.ac.cn) ; Zhang, Z. F.(zhfzhang@imr.ac.cn) |
| 2018-06-27 | |
| Source Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| ISSN | 0921-5093 |
| Volume | 729Pages:130-140 |
| Abstract | In this paper, the crack propagation characteristics in AISI 4340 steel with different strength and toughness have been investigated in quasi-situ via 3D X-ray tomography during fracture toughness testing. Three kinds of crack propagation characteristics were observed by the 3D image analysis, which were determined by the competition between cleavage fracture and voids growth/coalescence. It is found that the main crack would connect the micro-voids near the crack tip by cleavage fracture if the local stress achieves the cleavage fracture strength, resulting in rapid crack propagation. However, the growth and coalescence of micro-voids ahead of the crack tip would be linked with the main crack by strain-controlled, leading to the ductile fracture. The above two mechanisms would exist simultaneously in materials, which might be explained by the competition balance between strain and stress. Studying on transition of crack propagation mechanisms in materials would further understand the essence of fracture toughness. It will provide new insight into the fracture behavior of engineering materials and some new materials such as nanostructured materials and metallic glasses. Additionally, based on the energy principle, we propose a quantitative relationship between the microscope fracture surface morphology and fracture toughness of materials. |
| Keyword | Crack propagation X-ray tomography Fracture toughness Cleavage fracture Void growth and coalescence |
| Funding Organization | National Natural Science Foundation of China (NSFC) |
| DOI | 10.1016/j.msea.2018.05.056 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China (NSFC)[51331007] ; National Natural Science Foundation of China (NSFC)[51771208] ; National Natural Science Foundation of China (NSFC)[51771205] ; National Natural Science Foundation of China (NSFC)[U1664253] |
| WOS Research Area | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000439675100016 |
| Publisher | ELSEVIER SCIENCE SA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/128956 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Zhang, P.; Zhang, Z. F. |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China |
| Recommended Citation GB/T 7714 | Li, H. F.,Wang, S. G.,Zhang, P.,et al. Crack propagation mechanisms of AISI 4340 steels with different strength and toughness[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,729:130-140. |
| APA | Li, H. F.,Wang, S. G.,Zhang, P.,Qu, R. T.,&Zhang, Z. F..(2018).Crack propagation mechanisms of AISI 4340 steels with different strength and toughness.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,729,130-140. |
| MLA | Li, H. F.,et al."Crack propagation mechanisms of AISI 4340 steels with different strength and toughness".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 729(2018):130-140. |
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