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滚动接触条件下铁基涂层的疲劳磨损寿命实验研究 总被引:1,自引:0,他引:1
利用超音速等离子喷涂技术在45钢表面制备了铁基合金涂层,利用球盘式疲劳磨损实验机评价了铁基涂层在两种载荷条件下的疲劳磨损性能,利用两参数Weibull分布表征了涂层的疲劳寿命,采用扫描电子显微镜(SEM)分析了涂层的微观结构和失效形貌,利用有限元方法研究了涂层内部应力分布.实验结果表明,载荷条件可以显著地影响涂层的寿命和失效形貌,高载下涂层的寿命明显降低;随着载荷的增加,主要失效形式由表面磨损失效转换成剥层失效,其中表面磨损是由于粗糙接触引起,而剥层则与应力分布机制有关. 相似文献
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The distribution and magnitude of surface and subsurface stresses of the single-layer sprayed-coatings on monolithic substrates
were investigated by finite element method (FEM). The models of coating configurations with different thicknesses and elastic
modulus ratios of coating to substrate were introduced, and the effects of thickness and elastic modulus ratio on the stresses
were addressed. The calculation results show that the coating/substrate interface shear stress obviously decreases with increasing
coating thickness, due to the location of the maximum shear stress moving away from the coating/substrate interface. At the
same time, the magnitude of von Mises stress also declines in the case of thicker coatings. However, the high elastic modulus
ratio results in extremely high maximum shear stress and the severe discontinuity of the von Mises stress curves, which leads
to the intensive stress concentration on the coating/substrate interface. So the coating configurations with the larger coating
thickness and lower difference of elastic modulus between coating and substrate exhibit excellent resistant performance of
rolling contact fatigue (RCF). 相似文献
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干摩擦条件下3Cr13涂层的磨损寿命研究 总被引:1,自引:0,他引:1
在MM200摩擦磨损试验机上对高速电弧喷涂3Cr13涂层进行了干摩擦条件下的磨损寿命试验,通过恒定应力加速模型分别建立了载荷、涂层厚度、摩擦副转速与3Cr13涂层磨损寿命的关系图,并采用多元回归分析建立了预测3Cr13涂层磨损寿命的模型,对影响因素进行了相关度分析.结果表明:载荷的增大引起涂层内分层失效,涂层厚度的减小则引起涂层整层剥落,摩擦副的转速主要影响摩擦副间的犁沟和微切削程度.影响磨损寿命大小的因素依次顺序为:涂层厚度、载荷和摩擦副转速. 相似文献
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