Abstract
In this paper, the wear property of ER8 and SSW-Q3R wheel steel under pure rolling condition was studied by GMP-30 wear tester. The results showed that the wear loss of the ER8 wheel steel was higher than that of the SSW-Q3R wheel steel at the same cycles. The high carbon content of the SSW-Q3R improved the surface hardness during rolling wear. The high hardness increased the wear resistance of the SSW-Q3R wheel steel. During rolling wear, the fatigue wear resistance of ER8 wheel was worse than that of the SSW-Q3R wheel steel due to more proeutectoid ferrite content in ER8 wheel steel. The surface residual stress of ER8 and SSW-Q3R wheel steel increased with the increase in cycles. The axial residual compressive stress on the surface of the sample was greater than the circumferential residual compressive stress. The residual stress at the trough was higher than that at the crest.
Highlights
The wear failure of wheel and rail materials gradually becomes more severe with the increase in rolling speed and axle load
Under the dry wear condition, the wear mechanism of the wheel and rail materials transform adhesive wear into fatigue wear as the increase of slip ratio
At the depth of 40 μm~70 μm from the surface, no plastic deformation was produced in the pearlite, but fine grains were formed in the proeutectoid ferrite with a size of about 1 μm
Summary
The wear failure of wheel and rail materials gradually becomes more severe with the increase in rolling speed and axle load. The slip ratio can increase the shear stress at the contact surface of the wheel and rail materials, leading to the formation of severe plastic deformation and the change of wear mechanism. With the increase in the slip ratio, the thickness of the plastic deformation layer is gradually increased [4,5,6]. As the rolling speed increases, the surface hardness and the thickness of the plastic deformation is reduced. The wear loss of the wheel steel is increased, but the wear loss of the rail steel is gradually decreased [7]. The evolution of surface microstructure and the change of wear mechanism of two kinds of wheel steel were compared
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