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研究了轮轴钢LZ50在单轴微动疲劳条件下的应力-应变滞后回线,微动区的磨损特征及断口和截面形貌;分析讨论了磨屑的形成与演变过程及微动疲劳失效机制.结果表明,LZ50在单轴微动疲劳过程中消耗的塑性不可逆功少,微动损伤机制为粘着磨损、磨粒磨损,并伴有氧化磨损.磨损过程中基体材料脱落、破碎、氧化形成磨屑,其中的硬质氧化物颗粒促进了材料表面的磨粒磨损,加速了疲劳失效过程.微动疲劳裂纹萌生区的宽度大约为100μm,失效断裂面垂直载荷方向.
The stress-strain hysteresis loop, fretting zone wear characteristics, fracture surface and cross-section morphology of axle steel LZ50 under uniaxial fretting fatigue are studied. The formation and evolution of wear debris and the mechanism of fretting fatigue failure are analyzed and discussed The results show that LZ50 consumes little irreversible plasticity during uniaxial fretting fatigue, and the mechanism of fretting damage is adhesive wear, abrasive wear and oxidative wear, and the matrix material falls off, crushes and oxidizes to form a wear The hard oxide particles promote abrasive wear on the surface of the material and accelerate the fatigue failure process.The fretting fatigue crack initiation zone has a width of about 100 μm and the vertical direction of failure fracture surface.