GCr15钢超声微动疲劳性能研究

发布时间：2018-12-27 14:43

【摘要】：由微动产生的裂纹萌生对钢组件的疲劳强度具有重要影响。本文选择GCr15轴承钢,在20kHz超声疲劳试验机提供的循环载荷作用下,测试其超长寿命微动疲劳性能。试验结果显示,在109循环周次下微动疲劳强度影响因子达到0.37。通过电子扫描电镜观察试件磨损面和微动疲劳断口,并分析了高频超长寿命微动疲劳断裂机理。高周疲劳裂纹通常会在磨损面的粘着区与滑移区交界处萌生,超高周疲劳裂纹在粘着区内萌生。微动磨损面的面积以及磨损面的粘着区都随着试件疲劳寿命的增加而增加。
[Abstract]:The crack initiation caused by fretting has an important effect on the fatigue strength of steel assemblies. In this paper, GCr15 bearing steel is selected to test the fretting fatigue performance of GCr15 bearing steel under cyclic load provided by 20kHz ultrasonic fatigue tester. The results show that the fretting fatigue strength influence factor is 0.37 under 109 cycles. The wear surface and fretting fatigue fracture surface of the specimen were observed by SEM, and the fracture mechanism of fretting fatigue was analyzed. The high cycle fatigue crack usually germinates at the junction of the adhesion zone and the slip zone of the wear surface, and the ultra high cycle fatigue crack originates in the adhesion zone. The area of fretting wear surface and the adhesive zone of wear surface increase with the increase of fatigue life.
【作者单位】：四川大学空天科学与工程学院;
【基金】：国家自然科学基金(NO.11372201)资助
【分类号】：TG142.1

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