田峰,杨辉.AM50镁合金孔挤压强化对其疲劳性能的影响[J].表面技术,2014,43(1):55-58.
TIAN Feng,YANG Hui.Effects of Hole-expansion on Fatigue Property of AM50 Magnesium Alloy[J].Surface Technology,2014,43(1):55-58 |
| AM50镁合金孔挤压强化对其疲劳性能的影响 |
| Effects of Hole-expansion on Fatigue Property of AM50 Magnesium Alloy |
| 投稿时间：2013-08-30 修订日期：2013-10-24 |
| DOI： |
| 中文关键词: AM50 镁合金 孔挤压 疲劳性能 断口扫描 |
| 英文关键词:AM50 magnesium alloy hole-expansion fatigue property fracture scanning |
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| 中文摘要: |
| 目的 研究孔挤压处理对 AM50 镁合金疲劳性能的影响。 方法 对 AM50 镁合金进行孔挤压强化处理,使试样表面产生有益的残余压应力分布,并对残余应力的分布进行测定。 对未处理镁合金及孔挤压镁合金进行疲劳性能测试,对比疲劳寿命及疲劳裂纹扩展速率,对疲劳断口进行扫描,分析孔挤压对AM50 镁合金疲劳性能的影响。 结果 孔挤压处理后,孔周围残余压应力深度达到 5 . 5 mm,且最大压应力值达-563 MPa,试样的疲劳寿命较未处理时增加了 9 倍,疲劳裂纹扩展速率大大降低,疲劳裂纹源由未处理时的孔表面转移到了挤压强化层内部。 结论 孔挤压可以明显抑制疲劳裂纹的萌生,延长疲劳寿命。 |
| 英文摘要: |
| Objective To investigate the effects of hole-expansion on fatigue property of AM50 magnesium alloy. Methods AM 50 magnesium alloy was treated by hole-expansion, and beneficial compressive residual stress was introduced onto the sample surface, which was measured by X-ray diffraction technique. Meanwhile, the fatigue properties of both untreated and untreated samples were tested under sinusoidal wave load, the fatigue life and fatigue crack growth rate were analyzed, and the effects of hole-expansion on fatigue properties of AM50 magnesium alloy were studied. The fatigue fracture was analyzed by the SEM technique. Results The experimental results showed that the compressive residual stress layer reached 5. 5 mm around the hole after hole-expansion, and the maximum value was -563 MPa. Fatigue life increased from 28 936 cycles to 300 556 cycles by 9 times, while the fatigue crack growth rate greatly decreased. Conclusion SEM analysis showed that the fatigue initiation transferred inside the hole-expansion layer, which indicated that hole-expansion could obviously inhibit fatigue crack initiation and effectively enhance fatigue life. |
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