Wear Resistance of Steels with Surface Nanocrystalline Structure Generated by Mechanical-Pulse Treatment

Abstract

The influence of the surface mechanical-pulse treatment based on high-speed friction with a rapid cooling by the technological environment on the wear resistance of medium- and high-carbon steels was considered. The treatment due to a severe plastic deformation enabled obtaining the nanocrystalline structure with a grain size of 14–40 nm. A high positive effect of this treatment was obtained not only because of metal nanocrystallization but also thanks to other factors, namely, structural-phase transformations, carbon saturation of the surface due to decomposition of the coolant and the friction coefficient decrease. Higher carbon content leads to better strengthening of the surface, and its microhardness can reach 12 GPa.

Formation of Surface Ultrafine Grain Structure and Their Physical and Mechanical Characteristics Using Vibration‐Centrifugal Hardening

“…It also increases the wear resistance of unstable inserts by reducing the friction coefficient of the pair from 0.18 (for hardened samples) to 0.07 (for samples with surface UFGS) ( Figure 8). e main factors that cause an increase of wear resistance are increased microhardness and low coefficient of friction of the surface with UFGS [12,16,17]. e results obtained for increasing wear resisting properties of the inserts are in good agreement with [12,16,17], where the increase in wear resistance of both rings and inserts is shown in the case of hardening treatment made only for rings.…”

“…e study of wear resistance properties and the determination of the friction coefficient were carried out on a MI-1M friction machine using a ring-insert scheme in an oil and oil-abrasive environment. e sample rings were 75 mm in diameter [12]. Slavol M-3042 TU 13932946.015-96 with addition of 0.1 weight percent of quartz sand (up to 40 μm) was used as oil at 2.0 MPa load and a sliding speed of 0.9 m/s.…”

Microstructure Evolution and Wear Resistance Improvement of Ultrasonic Peened M50 Steel via Electromagnetic Shocking

“…It was investigated in the previous study that high microhardness and residual stress could help account for the better wear properties. [38][39][40] The gradient hardness in the subsurface of materials effectively delayed crack initiation. After the EST, the refinement of the subsurface microstructure, the uniform distribution of dislocations and the formation of dense oxide film together reduce the origin of cracks in the friction process, thus improving the wear resistance of USP-M50 steel.…”

Resistance to Wear during Friction without Lubrication of Steel-Cast Iron Pairing with Nanocrystalline Structure-Reinforced Surface Layers

“…In order to strengthen the surface layers of the working surfaces of machine parts, which in most cases work under frictional conditions, processing methods using concentrated energy sources are used [24,25]. These include laser [26], plasma, ion-beam [27], friction [28,29], and other treatments [30]. In the process of these treatments, concentrated sources of thermal energy act on local volumes of metal in the surface layer of the treated surfaces.…”