Research on the wear mechanism of the gun barrel steel under different temperatures
During service,small arms and gun barrels are subjected to high-temperature friction from gunpowder gas and projectiles,resulting in wear and tear,leading to changes in the shape of the inner chamber and a decrease in the lifespan of the barrel.In order to reveal the wear mechanism of the gun barrel steels,the H90 ball was selected as a friction pair against PCrNi3MoV gun barrel steels,and the friction test and the mechanism analysis were carried out on a UMT-3 tribometer at temperatures of 200 ℃,400 ℃,and 600 ℃ respectively.The 3D surface profilometer,XRD,SEM,EDS,and other related equipment were used to analyze the morphology,structure and composition of the wear tracks.The research results indicate that an increase in temperature can lead to increased plastic deformation of brass balls,thereby increasing the friction contact area.During the wear process,the compressed depth on the surface of the barrel steel deepens,resulting in increased friction force.The substrate under the oxide layer undergoes severe plastic deformation,and the friction coefficient increases with the increase of temperature.However,the wear rate of barrel steel shows a pattern of first increasing and then decreasing with increasing temperature,which is related to the strength changes of barrel steel and brass at different temperatures,as well as the thickness of the oxide layer.
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