Investigation on Friction and Wear Failure Mechanism of Rocket Sled Slide at Supersonic and Under High Load

The work aimed to analyze the friction and wear failure mechanism, and to provide technical reference of rocket sled slide at supersonic 938 m/s and under high load 850 kg. The tested slide was selected as the experimental material. The wear surface morphology and the chemical compositions of the slide were characterized by scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the cross-sectional hardness was tested by Vickers hardness testing system, and the metallography micro-structure was observed by metallographic microscope. The wear mechanism of the tested slide was adhesive wear, abrasive particles wear, oxidation wear and fatigue wear. The oxidized debris of Fe3O4 and grit covered the gouges and grooves in the wear face. The cross-sectional hardness decreased outside-in 1.6 mm thickness, the grain size became finer and carbide precipitated. The grain refinement and carbide precipitation illustrated that the flash point temperature of the wear surface reached the recrystallization temperature, and the mechanical property of rocket sled slide declined. There was serious ablation caused by high temperature in the wear surface, and the coexistence of different wear mechanism, and the gradient variation of hardness was caused by high temperature and pressure during the sliding process. © 2020, Materials Review Magazine. All right reserved.