On the formation of GBF of high-strength steels in the very high cycle fatigue regime

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	On the formation of GBF of high-strength steels in the very high cycle fatigue regime
	Y. B. Liu ; Z. G. Yang ; Y. D. Li ; S. M. Chen ; S. X. Li ; W. J. Hui ; Y. Q. Weng
刊名	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
	2008
卷号	497 期号:1-2 页码:408-415
关键词	Very high cycle fatigue High-strength steels GBF Stress intensity factor Hydrogen chromium-bearing steel long-life fatigue crack initiation inclusion size hydrogen behavior failure growth mechanism fracture
ISSN号	0921-5093
中文摘要	Very high cycle fatigue tests were conducted for six high-strength steels by using a 20-kHz ultrasonic fatigue testing machine. Most tests were conducted on one stress amplitude until 109 cycles: however, for further examination of the formation of the granular-bright-facet (GBF) on the fracture surface, a two-step loading test for commercial 60Si2Mn specimens was adopted. The failure of almost all specimens is caused by internal non-metallic inclusion. Experimental results show that the stress intensity factor at the edge of GBF on the fracture surface, K(GBF), is not a constant but proportional to (root area(GBF))(1/3). It means that KGBF does not correspond to the threshold value of a long crack but the threshold value of a small crack. The stress intensity factor, k(H), caused by hydrogen plays an important role during formation of GBF. (C) 2008 Elsevier B.V. All rights reserved.
原文出处	://WOS:000262033300059
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/32980]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. B. Liu,Z. G. Yang,Y. D. Li,et al. On the formation of GBF of high-strength steels in the very high cycle fatigue regime[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2008,497(1-2):408-415.
APA	Y. B. Liu.,Z. G. Yang.,Y. D. Li.,S. M. Chen.,S. X. Li.,...&Y. Q. Weng.(2008).On the formation of GBF of high-strength steels in the very high cycle fatigue regime.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,497(1-2),408-415.
MLA	Y. B. Liu,et al."On the formation of GBF of high-strength steels in the very high cycle fatigue regime".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 497.1-2(2008):408-415.