不同表面处理下H13钢的高温摩擦磨损行为

High temperature friction and wear behaviors of H13 steel with different surface treatments

为研究H13钢在抛丸和喷砂处理下高温摩擦磨损行为,利用UMT-3高温摩擦磨损试验机、扫描式电子显微镜、能谱仪和三维共聚焦表面轮廓仪等设备分析了H13钢在不同温度下的摩擦因数、磨面形貌、磨痕成分、磨损体积及磨痕深度。结果表明,抛丸和喷砂处理的H13钢表面硬度和粗糙度均比未处理的高。喷砂处理的试样在磨损前期摩擦因数波动小,更早进入稳定摩擦阶段。620℃时磨损体积由未处理的6×10^(-3)mm^(3)降低至喷砂处理的4×10^(-3) mm^(3),最大磨痕深度由40.423μm减小至16.837μm。未处理和抛丸处理的磨损机制分别为磨粒磨损和氧化磨损,喷砂试样中O元素含量大幅度降低,加工硬化效应使抵抗犁削和变形能力增强,磨损机制为氧化磨损和粘着磨损共同作用。经抛丸和喷砂处理的耐磨性能均比未处理要好,且喷砂处理的耐磨性能最佳。

To study the high temperature friction and wear behaviors of H13 steel with shot blasting and sandblasting treatments,the friction factor,wear surface morphologies,wear mark composition,wear volume and wear mark depth of H13 steel at different temperatures were analyzed by UMT-3 high temperature friction and wear tester,scanning electron microscope(SEM),energy disperse spectroscopy(EDS),three-dimensional confocal surface profulator and other equipments.The results show that the surface hardness and roughness of H13 steel treated by shot blasting and sandblasting are higher than those of untreated steel.The friction factor of sandblasted specimens fluctuates less in the early wear stage,and the friction enters a stable stage earlier.At 620℃,the wear volume decreases from 6×10^(-3)mm^(3) without treament to 4×10^(-3)mm^(3) after sandblasting treatment,and the maximum wear mark depth decreases from 40.423μm to 16.837μm.The wear mechanisms of untreatment and shot blasting treatment are abrasive wear and oxidation wear,respectively.The content of O element in sandblasted specimen decreases greatly,and the work hardening effect enhances the resistance to ploughing and deformation,and the wear mechanism is the joint action of oxidation wear and adhesive wear.The wear resistance of shot blasting and sandblasting treatment is better than that of untreatment,and the wear resistance of sandblasting treatment is the best.