Abstract
Wear intensity of the sliding electric contact steel 1020/steel 1045 depending on sliding time is presented at the contact current density higher than 100 A/cm2 without lubricant. It is shown that wear intensity of 1020 steel decreases at increasing of sliding time. Wear intensity is stabilized after some sliding time. This time (burn-in time) decreases at reduction of current density. Structural changes are realized in surface layer. Signs of liquid phase are observed on sliding surface. This liquid isn't a result of melting. It is established using Auger spectrometry that the contact layer contains up to 50 at.% of oxygen.
Highlights
It is known that high wear resistance of material during friction is reached due to structural stability of its contact layer [1]
Definition of sliding time sufficient for achievement of stable wear intensity at some set normal wear mode has to be the initial stage of peen studying without reaching of catastrophic wear regime
Dry sliding of steel 1020 against steel 1045 under the influence of electric current with a contact density higher 200 A/сm2 leads to changes of surface layer structure
Summary
It is known that high wear resistance of material during friction is reached due to structural stability of its contact layer [1]. The structural state of sliding surface will be stable in the case when external influence doesn't lead to its plastic deformation. It means that the contacting microvolumes will be deformed in the mode of elastic deformation or, more precisely, in the mode of high-cycle fatigue. Surface material self-organizes in this case and its structural changes take place It is formed the layer of friction induced structures (FIS) as it is shown in [4]. This layer has parameters of structure (thickness, roughness, phase and chemical composition, etc.) changing its values according to changes of parameters of external influence on the tribosystem. Structure parameters achieve its equilibrium values during some time at every regime of normal
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