Crack propagation mechanisms of AISI 4340 steels with different strength and toughness

doi:10.1016/j.msea.2018.05.056

IMR OpenIR

	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
通讯作者	Zhang, P.(pengzhang@imr.ac.cn) ; Zhang, Z. F.(zhfzhang@imr.ac.cn)
	2018-06-27
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	729 页码:130-140
摘要	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.
关键词	Crack propagation X-ray tomography Fracture toughness Cleavage fracture Void growth and coalescence
资助者	National Natural Science Foundation of China (NSFC)
DOI	10.1016/j.msea.2018.05.056
收录类别	SCI
语种	英语
资助项目	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研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000439675100016
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：52[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/128956
专题	中国科学院金属研究所
通讯作者	Zhang, P.; Zhang, Z. F.
作者单位	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
推荐引用方式 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.