| 汽车齿轮轴用钢SCM440H扭转疲劳寿命及断裂特征分析 |
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| 引用本文： | 孙永喜.汽车齿轮轴用钢SCM440H扭转疲劳寿命及断裂特征分析[J].中国冶金,2014,24(5):21-24. |
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| 作者姓名： | 孙永喜 |
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| 作者单位： | 山东钢铁股份有限公司莱芜分公司特钢事业部， 山东 莱芜 271104 |
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| 摘 要： | 通过试验测定汽车齿轮轴用钢SCM440H经淬火和高温回火后的扭转疲劳寿命，并采用扫描电镜(SEM) 对疲劳断口进行观察、分析。结果表明，显微组织为回火索氏体的SCM440H齿轮轴用钢，在106的循环周次下，扭转疲劳强度约为253MPa；不同切应力幅下的扭转疲劳断口呈现韧性断裂特征，疲劳断口裂纹源处没有明显的析出物。
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| 关 键 词： | 齿轮轴 SCM440H 扭转疲劳 分析 |
Analysis of Torsion Fatigue Life and Fracture Feature of Gear Shaft Steel SCM440H |
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| LI Fa-xing,ZHAI Zheng-long,SUN Yong-xi.Analysis of Torsion Fatigue Life and Fracture Feature of Gear Shaft Steel SCM440H[J].China Metallurgy,2014,24(5):21-24. |
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| Authors: | LI Fa-xing ZHAI Zheng-long SUN Yong-xi |
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| Affiliation: | （Special Steel Business Unit of Laiwu Branch， Shandong Iron and Steel Co., Ltd., Laiwu 271104, Shandong, China） |
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| Abstract: | Torsion fatigue life of gear shaft steel SCM440 H after quenching and high-temperature tempering has been tested,and the fatigue fracture surface was observed and analyzed by using scanning electron microscopy （SEM）. The results show that the torsion fatigue strength of the gear shaft steel SCM440 H with tempered Sorbite is about 253 MPa in 106 cycles.Observation shows that the torsion fatigue crack shows ductile fracture characteristics under different shear stresses and no inclusion precipitation was found at fatigue crack initiation sites. |
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| Keywords: | SCM440 H gear shaft SCM440 H torsion fatigue |
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