Crack growth rates and microstructure feature of initiation region for very-high-cycle fatigue of a high-strength steel

被引：26
作者：
Hu, Yuanpei [1 ,2 ]
Sun, Chengqi [1 ,2 ]
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
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2018年 / 41卷 / 08期
基金：
中国国家自然科学基金;
关键词：
crack growth rate; crack initiation; fine-granular-area; high-strength steel; variable amplitude loading; very-high-cycle fatigue; CHROMIUM-BEARING STEEL; LONG-LIFE FATIGUE; N-GREATER-THAN-10(7) CYCLES; ULTRASONIC FATIGUE; METALLIC MATERIALS; RESIDUAL-STRESSES; MECHANISM; BEHAVIOR; PROPAGATION; FAILURE;
D O I：
10.1111/ffe.12811
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The S-N data up to very-high-cycle fatigue (VHCF) regime for a high-strength steel were obtained by fatigue tests under constant amplitude and variable amplitude (VA) via rotating bending and electromagnetic resonance cycling. Crack initiation for VHCF was from the interior of specimens, and the initiation region was carefully examined by scanning electron microscopy and transmission electron microscopy. Crack growth traces in the initiation region of fine-granular-area (FGA) were the first time captured for the specimens under VA cycling by rotating bending. The obtained crack growth rates in FGA were upwards to connect well with those in fish-eye region available in the literature and were associated well with the calculated equivalent crack growth rates in FGA. The observations of profile samples revealed that FGA is a nanograin layer for the specimens under VA cycling, which is a new evidence to support the previously proposed numerous cyclic pressing model.
引用
收藏
页码：1717 / 1732
页数：16
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