张艳斌
,
张立民
,
张继旺
,
曾京
金属学报
doi:10.3724/SP.J.1037.2014.00021
对2014-T6铝合金疲劳试样的缺口部位进行了阳极氧化处理,表面氧化层厚度分别为5,10和20 μm.通过旋转弯曲疲劳试验机对阳极氧化处理前后的疲劳试样进行了疲劳实验.分析了阳极氧化处理对该铝合金材料弯曲疲劳性能的影响,并讨论了该材料的弯曲疲劳性能随着表面氧化层厚度增加的变化趋势.结果表明,在中低应力下,阳极氧化处理降低该铝合金材料的弯曲疲劳寿命;随着氧化层厚度增加,疲劳裂纹起始位置从氧化层表面转移到铝合金基体表面,材料的弯曲疲劳寿命降低,但厚度增加到一定程度,材料S-N曲线的倾斜部分随着氧化层厚度的继续增加基本保持不变.
关键词:
铝合金
,
阳极氧化处理
,
氧化层厚度
,
疲劳性能
,
疲劳极限
WU Zhixue
,
LU Wenge and XU Hao1)(Fushun Petroleum institute
,
Fushun 113001
,
China)2)(State Key Laboratory for Fatigue and Fracture of Materials
,
Institute of Metal Research
,
ChineseAcademy of Sciences
,
Shenyang 110015
,
China)3)(Institute of Mechanical Engineering
,
Northeastern University
,
Shenyang 110006
,
China)Manuscript received 19 July 1995
,
in revised form 11 April 1996
金属学报(英文版)
Rotary bending fatigue tests were carried out for smooth specimens of a mediumcarbon steel with two different grain sizes near the fatigue limit. The process of fatigue damagewas observed by replication method, and the effects of grain size,stress level and microstructure on surface damage were studied. The effect of following cycle stress level on the coaxing effects was also discussed. The fatigue limit is the maximum stress at which the short fatigue crack initiates and becomes a non-propagating crack.. The length of non-propagating crack is related to grain sizes and stress level. The coaxing effects disappear when the following stress level is greater than the critical value.
关键词:
: fatigue damage
,
null
,
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