双辉等离子渗铬与高碳钢淬火的耐磨性比较

Comparative Study on Wear Resistance of High Carbon Quenching and Double Glow Plasma Chromizing

目的研究相变点下双辉等离子渗铬的渗层在磨粒磨损条件下的耐磨性能。方法采用低温双辉等离子渗金属技术,在高碳钢表面直接形成高硬度渗层,比较研究T10钢整体淬火+低温回火(以下简称T10钢淬火)与调质态T10钢经550℃×8 h预先离子氮化再经560℃×4 h双辉等离子渗铬(以下简称T10钢低温渗铬)的耐磨粒磨损性能。结果在400#砂纸摩擦磨损条件下,T10钢淬火的磨损质量损失面积比率为3.5669×10^(-5)g/mm^2,远小于T10钢低温渗铬(2.9936×10^(-4)g/mm^2),其耐磨性是T10钢低温渗铬的近7倍;在2000#砂纸摩擦磨损条件下,T10钢低温渗铬的磨损质量损失面积比率为6.3694×10^(-6)g/mm^2,小于T10钢整体淬火(1.2739×10-5g/mm^2),其渗层耐磨性约为T10钢整体淬火的2倍。结论低温双辉等离子渗铬的渗层适用于小磨粒状态下的摩擦环境,磨粒的尺度应小于或与渗层的厚度相当。

To study wear resistance of chromizing layer of double glow plasma chromizing in phase transformation point under abrasive wear. Low temperature double glow plasma chromizing etc. were adopted to form a chromizing layer directly on the high-carbon steel surface. The abrasive resistance of abrasive wear in integral quenching of T10 steel ＋ low temperature tempering（shorted as T10 quenching） and T10 pre-nitriding at 550 ℃×8 h＋560 ℃×4 h chromizing（shorted as T10 steel low temperature chromizing） was studied comparatively. In the wearing condition of 400# sand paper, the area ratio of wear mass loss of T10 low temperature chromizing was 2.9936×10^-4 g/mm^2; that of the T10 quenching was 3.5669×10^-5 g/mm^2; it was far less than that of T10 low temperature chromizing; its wear resistance was nearly 7 times of the T10 quenching; in the wearing condition of 2000# sand paper, the area ratio of wear mass loss of T10 quenching was 1.2739×10^-5g/mm^2; that of the T10 low temperature chromizing was 6.3694×10^-6 g/mm^2, it was much less than that of T10 integral quenching; the wear resistance of T10 low temperature chromizing was 2 times of the T10 quenching. The chromizing layer of low temperature double glow plasma is applicable to small abrasive wear, and abrasive particle size must be less than or equal to size of chromizing layer.