超声振动对42CrMo铸钢管道硬度和耐磨性的影响

Effects of Ultrasonic Vibration on Hardness and Wear Resistance of 42CrMo Cast Steel Pipes

为了探讨超声振动对42CrMo铸钢管道硬度和耐磨性的影响,分别在激励频率为0 kHz(无超声振动)、20 kHz和25 kHz的超声振动下制备检测试样。使用Rtec摩擦试验机,获得了不同载荷条件下平均摩擦系数和摩擦稳定系数的变化规律。采用超声波清洗机对摩擦后的试样进行处理,并采用电子天平进行测量,得出磨损质量的变化规律。将硬度研究与金相观察相结合,得出了超声波振动对试样微观组织和表面硬度的影响规律。通过电子探针显微镜分析微磨损形态,结合元素分布测试结果,解释了超声振动对试样材料耐磨性的影响机理。研究表明,将超声振动应用于管道铸造的工艺过程中,可以显著提高管道的硬度、耐磨性和摩擦稳定性,特别是当激励频率为20 kHz时,管材力学性能的提升效果更显著。

In order to investigate effect of ultrasonic vibration on hardness and wear resistance of 42CrMo cast steel pipe,test samples were prepared under excitation frequency of 0 kHz(no ultrasonic vibration),20 kHz and 25 kHz ultrasonic vibration,respectively.Based on Rtec friction testing machine,variation patterns of average friction coefficient and friction stability coefficient under different load conditions were obtained.Ultrasonic cleaning machine was used to process friction samples,and high⁃precision electronic scale was used to measure changes in wear mass.The effect of ultrasonic vibration on the microstructure and surface hardness of specimen was obtained by combining hardness study with metallographic observation.The influence mechanism of ultrasonic vibration on wear resistance was explained by analyzing the micro wear morphology through electron probe microscopy and combining with the results of element distribution testing.Research shows that applying ultrasonic vibration to the process of pipeline casting can significantly improve the hardness,wear resistance,and friction stability of pipelines,especially when the excitation frequency is 20 kHz,the improvement effect of mechanical properties is more significant.