The aim of this study was to investigate the feasibility and possibilities of introducing nanosized particles into a steel matrix through a conventional casting process and to determine the effect of different nanoparticles and methods of incorporation on the strength, toughness and high-temperature wear resistance of martensitic steel. The results show that also in the case of a conventional casting process it is possible to obtain a homogeneous distribution of nanoparticles in the metal matrix, resulting in improved strength, maintained toughness and up to five times better high-temperature wear resistance of the Mn-Cr steel. However, the rate of improvement greatly depends on the method and type of nanoparticles incorporation. The most promising results were observed for the combination of carbon nanotubes, oxide nanoparticles and dispersant, sealed in a steel tube, with the dispersant providing the uniform distribution, the carbon nanotubes delivering the good toughness and the adhesive wear properties, and the oxide nanoparticles ensuring oxidation and abrasive-wear resistance.
COBISS.SI-ID: 1414570
Although extremely chemically reactive, oxygen plasmas feature certain properties that make them attractive not only for material removal via etching and sputtering, but also for driving and sustaining nucleation and growth of various nanostructures in plasma bulk and on plasma-exposed surfaces. In this minireview, a number of representative examples is used to demonstrate key mechanisms and unique capabilities of oxygen plasmas and how these can be used in present-day nano-fabrication. One of this is surface modification and functionalization of nano-particles to improve their wettability and prevent agglomeration.
COBISS.SI-ID: 31694375
Achieving a uniform distribution of reinforcement particles within a matrix is one of the challenges that impacts directly on the properties and quality of a composite material. Therefore, the aim of the present work was to investigate the influence of the reinforcing Al2O3 particles’ concentration and size on their distribution in reinforced austenite stainless steel. In this study, an innovative pre-dispersion approach for the addition of particles into a steel melt was designed. The results of this investigation indicate that the concentration and size of the Al2O3 particles has an impact on the distribution of the reinforcement within the matrix. When the weight percent increased to 2.5 the concentration ratio of the particles’ distribution decreases towards the bottom of the cast ingot. In this case also the size of particles starts to play a role, with the larger particle size leading to an increased degree of incorporating particles into the steel matrix. The larger the particles the more particles are found in the cast ingot.
COBISS.SI-ID: 1370538
By the invitation of Prof. W. Tuckarta from University Bahia Blanca, Argentina, results of scientific-research work on nano-particles reinforced steels were presented at the conference organized by Agentinian Association for Tribology. First part of the talk was focused on the effect of alloying method and introduction of nano-particles into the melt, followed by the effect of particles size and concentration and finished by the fatiqu, strength and high-temperature wear properties of Mn-Cr steels
COBISS.SI-ID: 1317290
In the present work, the influence of composition as well as quenching and tempering temperatures on microstructure evolution of 9-12 % Cr creep resistant steels was studied. It was found that composition influences on the type and number of precipitates while quenching and tempering parameters influence the number, size, and mutual spacing of precipitates in the steel. The effect of different heat treatment parameters on the steady state creep rate and time to rupture showed that for the higher quenching temperature, the number of precipitates increases while their mutual spacing decreases, which leads to improved creep resistance. Effect of tempering temperatures is the opposite and not so pronounced as in the case of quenching temperature.
COBISS.SI-ID: 1249450