一种节镍经济型耐热铸钢高温摩擦磨损行为研究

High Temperature Friction and Wear Behavior of a Kind of Low Nickel Heat Resistant Cast Steel

以ZG40Cr25Ni20耐热铸钢与节镍型耐热铸钢为试验材料,通过高温摩擦磨损试验探究了两种材料的高温摩擦磨损行为,分析摩擦系数、磨损率和微观结构随温度的变化规律,探讨了高温摩擦磨损机制。结果表明,随着温度的升高,摩擦系数逐渐减小,磨损率先升高后下降,在600℃时由剥落的氧化物磨屑颗粒重复的焊合和断裂以及反复的压实和烧结形成了釉质层,显著地降低了摩擦系数,有效地保护了基体,减少了两种材料的磨损量,在同等条件下,与ZG40Cr25Ni20相比,节镍型耐热铸钢具有更优的抗高温摩擦磨损性能。

High temperature friction and wear performance of ZG40Cr25Ni20 and a kind of low nickel heat resistant cast steel were comparatively investigated by means of high temperature friction and wear test. The variation of friction coefficient, wear rate and wear scar morphology with the temperature were analyzed, the friction and wear mechanism was discussed. The results show that with the increase of temperature, the friction coefficient of both materials decreased, the wear rate increased first and then decreased. At 600℃, with the repeated welding, fracturing and repeated compaction, sintering of oxide debris particle which peeled off from the test materials, enamel layer were formed at the surface, which reduced friction coefficient significantly, protected the substrate effectively. Compared with ZG40Cr25Ni20, in the same circumstance, the low nickel heat-resistant cast steel owns a better high temperature friction and wear resistant properties.