The Research On Friction And Wear Properties Of Low-Carbon Low-Alloy Steels

In this article, the tribological behaviors of low-carbon low-alloy steels were investigated. The curve of wear mass loss and friction coefficient were tested by the abrasive-wear tester under the conditions of contact load (50-200N) and sliding velocity (0.6-1.2m/s). The grinding material was GCr15steel. At the same time, with the help of scanning electron microscope (SEM) and energy disperse spectroscopy (EDS), the microstructure and morphologies of wear surface and wear subsurface had been studied. The micro hardness distribution of wear subsurface had been tested by the microhardness tester. According to the experimental results, the influence of load and sliding velocity on the friction and wear properties was analyzed. At last, the wear mechanisms of low-carbon low-alloy steels were studied basic on the basic theory of wear.Under the same condition of wear, the wear properties of N5-3steel and H40steel were the worst, its microstructure was tempered martensite. The microstructure of T1-1steel was ferrite and bainite, the strength and fracture toughness of T1-1steel were better than others, so its wear property was the best. The microstructure of N4-2、N7-2steel were martensite and residual austenite, the wear resistant of them was litter difference.The wear rate of the series of steel increased with the increase of the load, and the changing law of the series of steel was similar. The friction coefficient and its fluctuation range decreased with the increasing load in the case of the same sliding velocity. The disciplinarians of wear rate with sliding velocity were resemble for the series of steel. With the increase of sliding velocity, the wear rate of the series of steel also increased, and the peak of them happened in the sliding velocity of0.8m/s. The variation law of friction coefficient with the sliding velocity was opposite with the change rule of wear rate with the sliding velocity. The fluctuation range decreased with the increase of sliding velocity in the case of the same load.The wear mechanism of series of steel is similar. The wear surface relate flat, there were a small amount of traces of furrow and adhesive in the wear surface. The friction oxide generated in the wear surface, and the degree of oxidation increased and aggravated with the increase of load and sliding velocity. At the wear subsurface excited plastic flow area, its thickness increased with the increasing load. The thickness of deformation hardening layer of wear subsurface increased as load increased, the thickness of about150-200μm. The wear mechanism of series of steel mainly was oxidation wear and abrasive wear, and the others such as adhesive wear was a subordinate mechanism of the materials.