Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy | |
Su H(苏杭); Liu XL(刘小龙); Sun CQ(孙成奇); Hong YS(洪友士) | |
发表期刊 | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES |
2017-06-01 | |
卷号 | 40期号:6页码:979-993 |
ISSN | 8756-758X |
摘要 | The microstructural features and the fatigue propensities of interior crack initiation region for very-high-cycle fatigue (VHCF) of a Ti-6Al-4V alloy were investigated in this paper. Fatigue tests under different stress ratios of R=-1, -0.5, -0.1, 0.1 and 0.5 were conducted by ultrasonic axial cycling. The observations by SEM showed that the crack initiation of VHCF presents a fish-eye (FiE) morphology containing a rough area (RA), and the FiE and RA are regarded as the characteristic regions for crack initiation of VHCF. Further examinations by TEM revealed that a layer of nanograins exists in the RA for the case of R=-1, while nanograins do not appear in the FiE outside RA for the case of R=-1, and in the RA for the case of R=0.5, which is explained by the Numerous Cyclic Pressing model. In addition, the estimations of the fatigue propensities for interior crack initiation stage of VHCF indicated that the fatigue life consumed by RA takes a dominant part of the total fatigue life and the related crack propagation rate is rather slow. |
关键词 | Crack Initiation Fatigue Life Nanograins Ti-6al-4v Alloy Very-high-cycle Fatigue |
DOI | 10.1111/ffe.12562 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000400608100011 |
关键词[WOS] | HIGH-STRENGTH STEELS ; STRESS RATIO ; BEARING STEEL ; N-GREATER-THAN-10(7) CYCLES ; METALLIC MATERIALS ; BEHAVIOR ; LIFE ; MECHANISM ; PROPAGATION ; FAILURE |
WOS研究方向 | Engineering ; Materials Science |
WOS类目 | Engineering, Mechanical ; Materials Science, Multidisciplinary |
项目资助者 | National Natural Science Foundation of China(11572325 ; 11202210) |
论文分区 | 二类/Q1 |
力学所作者排名 | 1 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/60907 |
专题 | 非线性力学国家重点实验室 |
通讯作者 | Hong YS(洪友士) |
推荐引用方式 GB/T 7714 | Su H,Liu XL,Sun CQ,et al. Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy[J]. FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES,2017,40,6,:979-993. |
APA | Su H,Liu XL,Sun CQ,&Hong YS.(2017).Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy.FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES,40(6),979-993. |
MLA | Su H,et al."Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy".FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES 40.6(2017):979-993. |
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