Effects of Stress Ratio on the Fatigue Crack Growth Rate Under Steady State of Selective Laser Melted TC4 Alloy with Defects

doi:10.11900/0412.1961.2022.00154

IMR OpenIR

	Effects of Stress Ratio on the Fatigue Crack Growth Rate Under Steady State of Selective Laser Melted TC4 Alloy with Defects
	Qi Zhao 1,2; Wang Bin 2; Zhang Peng 2; Liu Rui 2; Zhang Zhenjun 2; Zhang Zhefeng 2
通讯作者	Zhang Peng(pengzhang@imr.ac.cn) ; Zhang Zhefeng(zhfzhang@imr.ac.cn)
	2023-10-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	59 期号:10 页码:1411-1418
摘要	TC4 alloy components with complicated geometries can be directly fabricated using selective laser melting (SLM) at a low cost. These components are often used under complex service conditions. Thus, it is important to investigate the effects of the stress ratio (R) on the fatigue crack growth (FCG) rate (da / dN) in SLM TC4 alloys with defects at the steady state to develop guidelines for damage-tolerance design and fatigue life assessment. In this work, SLM TC4 alloys containing two different microdefects were used to qualitatively examine the effect of the defect size on the da / dN at the steady state. In addition, comparative studies using an alloy with smaller defect sizes were performed at the steady state and at R = 0.1, 0.3, and 0.5. The relationship between the da / dN and stress intensity factor range (Delta K) was plotted and analyzed by fitting the Paris formula. The results show that the Paris formula parameter, m, is constant and the parameter, C, increases, which means that the increase in the defect size increases the da / dN. The da / dN increases with an increase in R, and the da / dN curves converge at low Delta K, which are reflected in the increase in the parameter, m, and the decrease in the parameter C. Additionally, there is a linear relationship between m and lgC (the common logarithm of C), which is not affected by R. Finally, the change patterns in the da / dN caused by the microdefects and R were analyzed along with the fatigue damage mechanisms.
关键词	selective laser melting TC4 alloy defect stress ratio fatigue crack growth rate Paris formula
DOI	10.11900/0412.1961.2022.00154
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001087007200012
出版者	SCIENCE PRESS
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/177937
专题	中国科学院金属研究所
通讯作者	Zhang Peng; Zhang Zhefeng
作者单位	1.Zhengzhou Univ, Henan Inst Adv Technol, Zhengzhou 450001, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Qi Zhao,Wang Bin,Zhang Peng,et al. Effects of Stress Ratio on the Fatigue Crack Growth Rate Under Steady State of Selective Laser Melted TC4 Alloy with Defects[J]. ACTA METALLURGICA SINICA,2023,59(10):1411-1418.
APA	Qi Zhao,Wang Bin,Zhang Peng,Liu Rui,Zhang Zhenjun,&Zhang Zhefeng.(2023).Effects of Stress Ratio on the Fatigue Crack Growth Rate Under Steady State of Selective Laser Melted TC4 Alloy with Defects.ACTA METALLURGICA SINICA,59(10),1411-1418.
MLA	Qi Zhao,et al."Effects of Stress Ratio on the Fatigue Crack Growth Rate Under Steady State of Selective Laser Melted TC4 Alloy with Defects".ACTA METALLURGICA SINICA 59.10(2023):1411-1418.