Microstructure refinement and grain size distribution in crack initiation region of very-high-cycle fatigue regime for high-strength alloys

被引：22
作者：
Chang, Yukun [1 ,3 ]
Pan, Xiangnan [1 ,2 ]
Zheng, Liang [3 ]
Hong, Youshi [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
[3] Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 134卷 / 134期
基金：
中国国家自然科学基金;
关键词：
Very-high-cycle fatigue; Crack initiation; Fine granular area (FGA); Rough area (RA); High-strength alloys; TITANIUM-ALLOY; FORMATION MECHANISM; METALLIC MATERIALS; STRESS RATIO; EARLY GROWTH; BEHAVIOR; TI-6AL-4V; STEEL; LIFE; PROPAGATION;
D O I：
10.1016/j.ijfatigue.2020.105473
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The microstructural features underneath the fracture surfaces of high-strength alloys experienced very-high-cycle fatigue were further investigated to show the nanograin layer in crack initiation regions under negative stress ratios due to numerous cyclic pressing (NCP) mechanism. The grain size and the thickness of nanograin layer in fine granular area of high-strength steels and rough area of titanium alloys were measured. A normalized quantity d* was proposed to characterize the distribution of the nanograin size. A new schematic to express NCP process was depicted to describe the contacting actions between crack surfaces, which causes the microstructure refinement of the high-strength alloys.
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页数：12
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