Very high cycle fatigue behavior of shot-peened 3Cr13 high strength spring steel
Very high cycle fatigue behavior of shot-peened 3Cr13 high strength spring steel
复制标题
喷丸3Cr13高强度弹簧钢的极高循环疲劳行为
DOI：
10.1016/j.matdes.2013.03.039
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发表时间：
2013-09-01
影响因子：
8.4
通讯作者：
Zhong, Qunpeng
中科院分区：
文献类型：
--
作者：
Nie, Baohua;Zhang, Zheng;Zhong, Qunpeng
研究了喷丸强化对3Cr 13高强度弹簧钢超高周疲劳性能的影响。在20 kHz下通过超声疲劳试验分析了经过电抛光（EP）和SP处理的样品。结果表明，在低应力幅下，两种类型的试样都发生了亚表面裂纹萌生。在夹杂物附近还观察到细颗粒区（FGA）。在FGA前端的应力强度因子范围被视为控制稳定的内部裂纹扩展的阈值。两种试样的S-N曲线在很高的循环区域都有所下降，与EP试样相比，SP试样次表面萌生的疲劳寿命有所降低。此外，根据裂纹扩展速率（假设巴黎定律）估算了FGA内部裂纹的疲劳寿命。考虑到SP试样内部的残余拉应力，S-N曲线对非金属夹杂物平均尺寸的预测与实验结果一致。(C)2013爱思唯尔有限公司保留所有权利。
The effect of shot peening (SP) on the very high cycle fatigue behavior of 3Cr13 high strength spring steel was investigated. The samples that underwent electro-polishing (EP) and SP treatments were analyzed at 20 kHz by ultrasonic fatigue tests. The results showed that subsurface crack initiation occurred in both types of specimens at low stress amplitude. A fine granular area (FGA) was also observed in the vicinity of the inclusion. The stress intensity factor range at the front of the FGA was regarded as the threshold value that controls the stable internal crack propagation. The S-N curve decreased in very high cycle regime for both types of specimens, and the fatigue life for the subsurface initiation of the SP specimens was reduced compared with that of the EP specimens. Furthermore, the fatigue life of the internal crack in the FGA was estimated based on the crack propagation rate assuming Paris' law. Considering the tensile residual stress in the interior of the SP specimens, the prediction of the S-N curves on the mean size of the non-metallic inclusions were consistent with the experimental results. (C) 2013 Elsevier Ltd. All rights reserved.