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采用超声波对汽车车身用4Cr W2Si钢件进行超声振动离子氮化,并进行了渗层结构、渗层深度、表面硬度、耐磨损性能和抗高温氧化性能的测试与对比分析。结果表明,采用适当频率的超声波振动,将有助于在钢件离子氮化层中形成硬质化合物相Cr2N,增加渗层深度和表面硬度,提高钢件的耐磨损性能和抗高温氧化性能。随超声波频率从25 k Hz增加至100 k Hz,超声振动离子氮化4Cr W2Si钢件的渗层深度和表面硬度均先增大后减小,而磨损体积和600℃高温氧化后单位面积质量增加则先减小后增大;超声频率优选为55~85 k Hz。
Ultrasonic vibration was used to fabricate 4Cr W2Si steel for automotive nitriding by ultrasonic vibration. The structure of infiltrated layer, depth of infiltrated layer, surface hardness, wear resistance and high temperature oxidation resistance were tested and compared. The results show that ultrasonic vibration with the proper frequency will help to form hard compound phase Cr2N in the nitriding layer of steel, which will increase the depth of penetration layer and surface hardness and improve the wear resistance and high temperature oxidation resistance . As the ultrasonic frequency increases from 25 kHz to 100 k Hz, the penetration depth and surface hardness of the ion-strengthened 4Cr W2Si steel increases first and then decreases, while the wear volume and the mass per unit area increase after high temperature oxidation Then decrease and then increase; the ultrasonic frequency is preferably 55-85 k Hz.