目的：研究RE-N-C-S-V-Nb多元共渗H13钢的高温耐磨性,为避免铝型材挤压模具的早期磨损失效提供表面强化的新工艺。方法把多元共渗试样及对比试样进行高温摩擦磨损实验,然后利用金相显微镜、扫描电镜、能谱分析仪、X射线衍射仪等设备进行检测分析。结果淬火试样和软氮化试样均存在较严重的磨粒磨损和粘着磨损现象,渗层有微裂纹,高温摩擦系数曲线有明显的波动和峰值,磨损率分别为21.20×10-13,11.30×10-13 m3/(N·m),在560℃保温4 h后的显微硬度分别为584,1018HV0.1。RE-N-C-S-V-Nb多元共渗试样以微量氧化磨损和微量粘着磨损形式出现,渗层无裂纹,高温摩擦系数曲线平缓,磨损率仅为2.96×10-13 m3/(N·m),显微硬度高达1334HV0.1。结论 RE-N-C-S-V-Nb多元共渗H13钢具有较强的高温耐磨性。
ABSTRACT:Objective To investigate the wear resistance at high temperature of H13 steel by RE-N-C-S-V-Nb multicomponent permeating treatment, in order to provide new technology to avoid premature wear of aluminum extrusion die. Methods The high temperature wear property of compound deposition samples and control samples was tested and then the samples were detected by means of optical microscopy ( OM) , scanning electron microscopy ( SEM) , X-ray energy dispersive spectroscopy ( EDS) , and X-ray diffraction. Results It was found that quenched samples and tufftriding samples all had severe abrasive wear and adhesive wear phenomenon, microcracks appeared on the permeation layer, the high temperature friction coefficient curve had obvious fluctuations and peaks, the high temperature wear rate for the two kinds of samples was respectively at 21. 20×10-13,11. 30×10-13 m3/(N·m), The microhardness at 584HV0. 1 and 1018HV0. 1 after incubation for 4 h at 560 ℃. The RE-N-C-S-V-Nb compound deposition sample had mostly micro oxidation wear and adhesive wear, no microcracks appeared on the permeation layer, the high temperature
friction coefficient curve was gentle, the high temperature wear rate was only up to 2. 96×10-13 m3/(N·m), 1334HV0. 1 at mi-crohardness. Conclusion H13 steel after RE-N-C-S-V-Nb multi-element penetrating has a strong high-temperature wear resistance.
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