20kHz和140Hz下高强汽车弹簧用钢的疲劳性能

发布时间：2018-02-25 04:26

本文关键词： 高强弹簧钢超高周疲劳鱼眼粒状亮面频率效应　出处：《武汉工程职业技术学院学报》2016年04期 　论文类型：期刊论文

【摘要】：对一种高强汽车弹簧用钢分别进行了常规疲劳和超高周疲劳试验。常规疲劳试验频率为140Hz,超高周疲劳试验频率为20kHz。采用扫描电镜分别对失效试样进行断口扫描分析。结果表明,140Hz和20kHz下的疲劳断口表现出相似的特征,在106循环周次内失效的试样断口起源萌生于试样表面;而高周和超高周疲劳试样断口起裂于试样次表面或内部,且断口呈现"鱼眼"状特征。另外,超高周疲劳断口裂纹源周围存在粒状亮面特征区。弹簧钢的超高周疲劳S/N曲线呈现二次下降型特性,其S/N曲线的形态特征跟试样夹杂物尺寸密切相关。140Hz得到的疲劳试验结果与20kHz下的超高周疲劳试验结果有着明显的偏差,弹簧钢频率效应明显。
[Abstract]:The conventional fatigue test and ultra high cycle fatigue test of a high strength automobile spring steel were carried out. The frequency of routine fatigue test was 140 Hz, and the frequency of ultra high cycle fatigue test was 20 kHz. The fracture of failure samples was separated by scanning electron microscope (SEM). The results show that the fatigue fracture surfaces at 140Hz and 20kHz show similar characteristics. The fracture surface of the specimen that failed within 106 cycles originates on the surface of the specimen, while the fracture surface of the high-cycle and ultra-high cycle fatigue specimen originates on the sub-surface or inside of the specimen, and the fracture surface shows a "fish-eye" feature. There is a granular bright surface characteristic area around the crack source of ultra high cycle fatigue fracture. The curve of S / N of ultra high cycle fatigue of spring steel shows the characteristic of quadratic descent. The shape characteristics of the S / N curve are closely related to the sample size. 140 Hz fatigue test results and 20 kHz ultra-high cycle fatigue test results have obvious deviation, spring steel frequency effect is obvious.
【作者单位】：武钢研究院;
【分类号】：TG142.41;TG115.57

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