Wear minimization for highly loaded iron-based MMCs due to the formation of spongy-capillary texture on the friction surface

Feldshtein, E.; Dyachkova, L. N.

doi:10.1016/j.wear.2019.203161

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…It was also found that changes in the surface layer microstructure promote the formation of spongy-capillary areas, which were noticeable on the wear surfaces, especially at a high surface energy density ( Figure 12 c), and which provided higher wear resistance. A similar effect was described in [ 20 ].…”

Section: Resultssupporting

confidence: 84%

On the Microstructure, Microhardnessand Wear Behavior of Gray Cast Iron Surface Layer after Laser Strengthening

et al. 2022

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Cast iron is one of the most common structural materials and is widely used in mechanical engineering production. Taking into account its rather low mechanical properties, different technologies are currently used in industry, among other areas, for the mechanical and thermal strengtheningof the surface layer, as well as surface alloying of workpieces. The aim of this study was a comprehensive analysis of changes in the microstructure, microhardness of the surface layer and its wear resistance under lubrication friction conditions and changed surface energy density in order to ensure the effectiveness of laser strengthening of gray cast iron. In this research, the efficiency of gray cast iron GJL200 laser strengthening was described. The basic properties of the surface layer of gray cast iron under laser strengthening, including the microstructure, microhardness, tribological and wear behavior, were compared with the properties of cast iron in the initial state. It was found that laser strengthening under the right choice of the surface energy density ensured a five-to-tenfold increase in the wear resistance of gray cast iron in comparison with the initial state. This was due to forming unconventional pseudo-vermicular graphite shapes at the friction zone, as well as a spongy-capillary effect appearance. The appropriate selection of surface energy density values provided stable and low coefficients of friction and a very significant increase in the wear resistance compared with the values reached for a cast iron in the initial state. This fact is new and very important for the engineering practice. The values of the surface energy density can be easily controlled, which means that different parts can be operated efficiently after laser strengthening.

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Section: Resultssupporting

confidence: 84%

On the Microstructure, Microhardnessand Wear Behavior of Gray Cast Iron Surface Layer after Laser Strengthening

et al. 2022

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“…As described in [ 22 ], the wear behavior of composites under significant loads is characterized by the specific nature of the wear. Under such conditions and regardless of the composition of MMCs or of the methods of reinforcement and manufacturing techniques on the friction surfaces of composites, a complicated spongy-capillary texture is formed (see Figure 11 c,d), providing a significant increase in the wear resistance.…”

Section: Resultsmentioning

confidence: 99%

On Investigating the Microstructural, Mechanical, and Tribological Properties of Hybrid FeGr1/SiC/Gr Metal Matrix Composites

2021

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In recent years, studies of different properties of hybrid metal matrix composites, as well as very detailed issues, have been published. In this article, ready-made iron, graphite, and silicon carbide powders were used to produce the base material and composites. An analysis of some microstructural and mechanical properties, as well as the tribological behavior of metal matrix composites (MMCs), based on FeGr1 sintered material with the single and hybrid addition of a silicon carbide and graphite was undertaken. During the study, the flexural and compressive strength of MMCs were analyzed and changes of the momentary coefficient of friction, the temperature of friction, as well as wear rates of the MMCs tested were monitored. Based on the results, it was revealed that wear rates decreased 12-fold in comparison to the base material when SiC or SiC + Gr were added. Further research into MMCs with ceramic particle additives is proposed.

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“…The study of the morphology of worn surfaces has shown that when the base FeGr1 material and base material with 1 wt% C addition are subjected to friction, typical types of wear can be observed—abrasion and adhesion processes. However, upon the introduction of Al 2 O 3 and SiC nanoparticulates into the composite matrix, the nature of wear changes: A spongy-capillary texture, described in [ 26 ], is observed. The spongy-capillary effect occurs with the friction of composite porous materials under high loads and the presence of oil.…”

Section: Resultsmentioning

confidence: 99%

On the Microstructure, Strength, Fracture, and Tribological Properties of Iron-Based MMCs with Addition of Mixed Carbide Nanoparticulates

et al. 2020

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In this paper, the features of the strength, fractures, and tribological behavior of metal-matrix composites based on the FeGr1 material are discussed. To improve the material properties, a mixture of SiC, Al2O3 and C nanoparticulates have been added to an iron-based matrix. The simplex lattice design method and hardness, compression, and bending tests were used to determine the mechanical properties. Scanning electron microscopy was applied for fracture features analysis. Different fracture types, mainly trans-crystalline quasi-brittle and brittle fracture or inter-granular fracture and microcracks were registered for the composites tested. Depending on the type and amount of ceramic additives, significant changes in strength, as well as in the fracture features of the metal-matrix composites (MMCs), were observed. Based on tribological tests, changes in the momentary coefficients of friction, temperature of the friction surface, and wear rate of the composites with nanoparticulates were described. An analysis of the worn surface morphology revealed changes in the wear process depending on the MMC composition. It was shown that the use of hybrid mixed additives based on hard ceramic nanoparticulates improved both strength and tribological properties of composites.

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Wear minimization for highly loaded iron-based MMCs due to the formation of spongy-capillary texture on the friction surface

Cited by 8 publications

References 19 publications

On the Microstructure, Microhardnessand Wear Behavior of Gray Cast Iron Surface Layer after Laser Strengthening

On the Microstructure, Microhardnessand Wear Behavior of Gray Cast Iron Surface Layer after Laser Strengthening

On Investigating the Microstructural, Mechanical, and Tribological Properties of Hybrid FeGr1/SiC/Gr Metal Matrix Composites

On the Microstructure, Strength, Fracture, and Tribological Properties of Iron-Based MMCs with Addition of Mixed Carbide Nanoparticulates

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