含硫高速钢的高温摩擦性能(英文)

引入适量的硫可以明显改善铁基材料的摩擦学性能。采用粉末冶金技术制备了含硫高速钢样品材料,采用销盘高温摩擦试验机研究了该样品材料与不同配副(自对偶和GT35钢结硬质合金)摩擦时的高温摩擦性能,通过SEM、EDS和XPS检测了摩擦面,并分析了其摩擦机理。结果表明:与自对偶盘和GT35盘这2种对偶材料摩擦时,摩擦因数的变化趋势是随着温度的升高而逐渐降低的,磨损率则是随着温度的升高而逐渐变大的;在400℃和700℃时的摩擦因数曲线比室温时更加平稳,与GT35摩擦时样品材料的综合高温摩擦性能最佳;在400℃以下时,由于样品材料中硫化物的软化会使得材料的摩擦因数随着温度的升高而降低,在400℃以上时样品材料摩擦因数的降低主要是由于摩擦面的氧化物作用而引起的。

Tribological properties of sulfur-containing high-speed steels at elevated temperature

Tribological properties of ferrous-based alloys can be effectively improved by introducing an appropriate amount of elemental sulfur into the alloys. A few samples of sulfur-containing high-speed steels were prepared by powder metallurgy techniques. High temperature friction properties of the samples mating with different counter materials, i.e., self-dual and GT35 steel bonded carbide were studied on a pin-on-disk tribo-meter. Worn surfaces were analyzed using SEM, EDS and XPS, and the friction mechanism was discussed. It is found that for both cases of self-dual and GT35 counter mates, the friction factors gradually decrease and the wear rates increase with rising the temperature. The friction coefficient curves become more stable at 400 °C and 700 °C than at room temperature, and the better friction performance is observed for the GT35. Below 400 °C, friction coefficients drop with rising the temperature, due to sulfide softening. Above 400 °C, friction coefficients drop mainly due to the formation of oxides on the worn surfaces.