Effect of Inclusions on High Cycle Fatigue Characteristics of Spring Steel
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摘要: 利用Aspex夹杂物自动扫描电镜对60Si2Mn弹簧钢铸坯和钢材不同部位的夹杂物尺寸、数量进行分析,利用旋转弯曲疲劳试验机对材料的疲劳性能进行测试,揭示了钢中夹杂物的分布规律,同时分析了钢材不同缺陷形式和分布对材料发生失效的影响机理。结果表明,其旋转弯曲疲劳极限为σ-1=764 MPa,疲劳极限与抗拉强度的比值0.45,具有良好的疲劳性能;夹杂物平均尺寸较大为24.9μm且分布在钢材近表面处,容易发生较低周次(<106)的疲劳失效。Abstract: In this paper the size and quantity of inclusions in different parts of spring steel slab and steel was determined by using Aspex inclusion automatic scanning electron microscope,and the fatigue properties of the materials were tested using a rotating bending fatigue tester.The rules of the distribution of inclusions in steel was revealed,and the influence mechanism of different defect forms and distributions of steel on the failure of materials was analyzed.The results show that when the rotation bending fatigue limit is σ-1= 764 MPa,the ratio of fatigue limit to tensile strength is 0.45.Fatigue failure occurs at a lower cycle(<106),when the average size of inclusions is greater than 24.9 μm and is distributed near the surface of the steel.
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Key words:
- spring steel /
- 60Si2Mn /
- inclusions /
- Aspex /
- fatigue performance /
- fatigue lifting diagram
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