论文部分内容阅读
采用超音速等离子喷涂设备在45#钢基体上制备了铁基自熔剂合金涂层,通过球盘式接触疲劳试验机考察了喷涂层的疲劳磨损行为,利用声发射技术实时监测涂层的疲劳磨损过程,使用扫描电子显微镜对涂层不同疲劳磨损阶段的损伤形貌进行表征,并分析了涂层损伤机理.结果表明:转速2 000 r/min和应力水平1.848 9 GPa条件下,剥落是涂层失效的主要形式.声发射幅值和绝对能量可以反映涂层的疲劳磨损过程.涂层的疲劳磨损过程主要包括弹塑性变形、裂纹萌生、裂纹稳定存在、裂纹稳定扩展、裂纹失稳扩展5个阶段,其中裂纹稳定存在时间是影响疲劳寿命长短的关键.
The iron-based self-fluxing alloy coating was prepared on a 45 # steel substrate by supersonic plasma spraying equipment. The fatigue wear behavior of the sprayed coating was investigated by a ball-and-socket contact fatigue tester. The fatigue wear of the coating was monitored by acoustic emission , The damage morphology of the coating during different fatigue and wear phases was characterized by scanning electron microscopy and the damage mechanism of the coating was analyzed.The results show that the coating is peeled off at a speed of 2 000 r / min and a stress level of 1.848 9 GPa The main form of failure.The acoustic emission amplitude and absolute energy can reflect the fatigue wear process of the coating.The fatigue wear process of the coating mainly includes elastic-plastic deformation, crack initiation, crack stability, stable crack growth, crack instability expansion 5 Stage, in which the existence of crack stability is the key to affect the length of fatigue life.