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采用金相显微(OM)、X射线衍射(XRD)、扫描电镜(SEM)、万能力学试验机以及摩擦磨损试验等方法,研究了一种Cr25系耐热钢的组织、相结构、力学性能以及在室温、100℃、260℃下的摩擦磨损特性。研究结果表明:该种Cr25系耐热钢由α相和(Fe·Cr)_(23)C_6(KI)型碳化物相组成,其室温抗拉强度高、塑性差,冲击韧度低于6 J/cm2。在室温下,合金的磨损机制为磨粒磨损,随着磨损温度的增加,摩擦热效应增强,合金的磨损机制逐渐转变为磨粒+粘着磨损;摩擦系数由室温下的0.6逐渐降低到100℃下的0.4,到260℃时,其摩擦系数低至0.35,且其未随磨损时间的延长而显著变化;磨损量随磨损温度的增加逐渐降低。
The microstructure, phase structure and mechanical properties of a Cr25 heat-resistant steel were studied by means of OM, XRD, SEM, universal mechanical testing machine and friction and wear test. Room temperature, 100 ℃, 260 ℃ friction and wear characteristics. The results show that the Cr25 heat-resisting steel is composed of α-phase and (Fe · Cr) _ (23) C_6 (KI) carbide phase and has high room temperature tensile strength, poor plasticity and impact toughness less than 6 J / cm2. At room temperature, the wear mechanism of the alloy is abrasive wear. As the wear temperature increases, the frictional heat effect increases and the wear mechanism of the alloy gradually changes to abrasive + adhesive wear. The friction coefficient decreases gradually from 0.6 to 100 ℃ at room temperature Of 0.4, to 260 ℃, the friction coefficient as low as 0.35, and it did not change significantly with the extension of wear time; wear volume decreases with increasing wear temperature.