Size Effect on the Fatigue Performance of 18CrNiMo7-6 Alloy Steel,Steel Research International

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Size Effect on the Fatigue Performance of 18CrNiMo7-6 Alloy Steel
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-13 , DOI: 10.1002/srin.202100054
Gang Wang _{1,

2} , Chen Gao _{1,

2} , Yue Zhang _{1,

2} , GuangTao Xu _{1,

2} , MingHao Zhao _{1,

2}

Affiliation

The size effect on the fatigue performance of 18CrNiMo7-6 alloy steel is investigated. From rotating bending fatigue tests at room temperature, the relationship between the stress amplitude and the number of cycles of specimens with different diameters is obtained. The surface topography, residual stress, and fracture surface of the specimen are measured. The results show that the fatigue strength increases with increasing diameter of the specimen. The fracture of the small specimens tends to be brittle fracture, whereas the fracture of the large specimens is inclined to be ductile fracture. The effects of the surface condition, relative stress gradient (RSG), residual stress, and fatigue crack propagation life on the fatigue performance of the alloy are discussed. The reasons for the size effect are interpreted in terms of the change in the RSG caused by residual stress, the trend of the RSG significantly changes with changing specimen size under different stress levels. The crack propagation life of the large specimens is longer than those of the small specimens.

中文翻译：

尺寸对18CrNiMo7-6合金钢疲劳性能的影响

研究了尺寸对18CrNiMo7-6合金钢疲劳性能的影响。通过室温下的旋转弯曲疲劳试验，得到了不同直径试样的应力幅值与循环次数的关系。测量试样的表面形貌、残余应力和断裂面。结果表明，疲劳强度随着试样直径的增加而增加。小试样的断裂倾向于脆性断裂，而大试样的断裂倾向于韧性断裂。讨论了表面状态、相对应力梯度(RSG)、残余应力和疲劳裂纹扩展寿命对合金疲劳性能的影响。尺寸效应的原因解释为残余应力引起的RSG变化，在不同应力水平下，RSG的趋势随着试样尺寸的变化而发生显着变化。大试样的裂纹扩展寿命比小试样长。

更新日期：2021-04-13

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