Separation in liquid and the formation of supersaturated solid solutions in Fe–Cu alloys upon rapid laser melting

Kharanzhevskiy, E. V.

doi:10.1134/s0031918x16070097

Cited by 12 publications

(7 citation statements)

References 15 publications

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“…Such a limited melting depth is a result of a high gradient of temperatures in the irradiated zone. Against this background, the solidification of the melt is a strongly nonequilibrium process leading to the formation of metastable phases, as it was demonstrated in [20]. The active mixing of the melt at high temperatures results in an interaction between the boron-based ceramics and the melted steel.…”

Section: Resultsmentioning

confidence: 89%

Application of some inhibitors for improving the corrosion resistance of ceramic coatings deposited on non-alloy steel by short-pulse laser treatment

2020

Int. J. Corros. Scale Inhib.

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Short-pulse laser treatment was used to deposit boron carbide and nitride-based ceramic coatings on a non-alloy steel surface. The coatings thus obtained show promising properties in terms of high hardness, wear resistance, adhesion to the substrate, and low coefficient of friction. In parallel, the coatings obtained were characterized by reduced corrosion resistance in a model borate buffer solution and under conditions of recurrent water vapor condensation in a thermal humidity chamber. Preliminary treatment of samples with solutions of some inhibitors made it possible to reduce anodic currents substantially in potentiodynamic experiments. The addition of benzotriazole, mercaptobenzothiazole, and potassium dichromate proved to be effective. Electrochemical and atmospheric corrosion tests revealed that preliminary exposure of the samples to solutions of the inhibitors indicated above made it possible to reduce the corrosion rate significantly compared to the untreated samples. Potassium dichromate occurred to be most effective.

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Section: Resultsmentioning

confidence: 89%

Application of some inhibitors for improving the corrosion resistance of ceramic coatings deposited on non-alloy steel by short-pulse laser treatment

2020

Int. J. Corros. Scale Inhib.

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show abstract

“…Such precipitates could only emerge during the binodal decomposition of the supercooled iron-oxides melt prior to its fast solidi cation. The structures formed in the initial stages of binodal or spinodal melt decomposition are typical for the selected high-energy, short-pulse laser melting process [27]. The ultra-rapid cooling rate inhibits the continuation of melt decomposition, solidifying a supersaturated solid solution of usually separate components in a rigid phase [27].…”

Section: Resultsmentioning

confidence: 99%

“…The structures formed in the initial stages of binodal or spinodal melt decomposition are typical for the selected high-energy, short-pulse laser melting process [27]. The ultra-rapid cooling rate inhibits the continuation of melt decomposition, solidifying a supersaturated solid solution of usually separate components in a rigid phase [27]. In this scenario, the initial uniform iron-oxides melt partially decomposes into spherical liquid precipitates abundant in oxides, enveloped by a supersaturated oxidesiron melt.…”

Section: Resultsmentioning

confidence: 99%

“…A distinguishing characteristic of this technology is the ultra-high rates of thermal cycling, capable of generating highly non-equilibrium states of materials, such as amorphous or nanocrystalline phases [25,26]. For instance, this technology can stabilize profoundly supersaturated solid solutions in equimolar Cu-Fe alloys [27]. The technique also allows synthesizing a broad spectrum of ceramic coatings on steels.…”

Section: Methodsmentioning

confidence: 99%

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Towards eliminating friction and wear in plain bearings operating without lubrication

Kharanzhevskiy,

Ipatov,

Makarov

et al. 2023

Preprint

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Plain bearings, owing to their versatility and simplicity, are extensively utilized in engineering design across a variety of industries involving moving parts. Lubrication is vital to the functioning of these bearings so their usage is inhibited under dynamic load conditions or at elevated or reduced temperatures due to this dependency on lubrication. This study introduces an innovative method to significantly mitigate friction and wear in plain bearings operating without lubrication. The plain bearings were constructed from steel-bronze pairs, where the steel shafts were alloyed with bismuth oxide via short-pulse laser treatment. To incorporate the bismuth oxide into the surface layers of the steel, MnO2 was utilized as a carrier. Insights from transmission electron microscopy and X-ray photoelectron spectroscopy exposed a highly non-equilibrium state of matter, which is unattainable through conventional engineering methods. The tribological performance of the modified steel disks was assessed via a block-on-ring sliding test, demonstrating superior wear and friction performance without lubrication, and an ultra-low coefficient of friction. Remarkably, the modified friction pairs remained functional after 200 km of linear sliding at a load of 250 N (12.5 MPa) and a sliding speed of 9 m/s. To substantiate the technique's viability, we tested the performance of an internal combustion engine turbocharger fitted with a modified steel shaft. The turbocharger's performance validated the long-term effectiveness of the steel-bronze coupling operating without lubrication at 75,000 rpm. The simplicity and resilience of this technique for modifying steel-bronze pairs offer a ground-breaking and promising approach for a wide range of applications.

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“…A distinguishing characteristic of this technology is the ultra-high rates of thermal cycling, capable of generating highly non-equilibrium states of materials, such as amorphous or nanocrystalline phases 30 , 31 . For instance, this technology can stabilize profoundly supersaturated solid solutions in equimolar Cu-Fe alloys 32 . The technique also allows synthesizing a broad spectrum of ceramic coatings on steels.…”

Section: Methodsmentioning

confidence: 99%

Towards eliminating friction and wear in plain bearings operating without lubrication

Kharanzhevskiy,

Ipatov,

Makarov

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Plain bearings, renowned for their versatility and simplicity, are extensively utilized in engineering design across various industries involving moving parts. Lubrication is vital to the functioning of these bearings, yet their usage is inhibited under dynamic load conditions, or at elevated or reduced temperatures due to this dependency on lubrication. This study introduces an innovative method to significantly mitigate friction and wear in plain bearings operating without lubrication. The plain bearings were constructed from steel–bronze pairs, where the steel shafts were alloyed with bismuth oxide via short-pulse laser treatment. MnO2 was utilized as a carrier to incorporate the bismuth oxide into the surface layers of the steel. Insights from transmission electron microscopy and X-ray photoelectron spectroscopy revealed a highly non-equilibrium state of matter, unattainable through conventional engineering methods. The tribological performance of the modified steel disks was assessed via a block-on-ring sliding test, demonstrating superior wear and friction performance without lubrication, as well as an ultra-low coefficient of friction. Remarkably, the modified friction pairs remained functional after 200 km of linear sliding at a load of 250 N (12.5 MPa) and a sliding speed of 9 m/s. To substantiate the technique’s viability, we tested the performance of an internal combustion engine turbocharger fitted with a modified steel shaft. The turbocharger’s performance validated the long-term effectiveness of the steel–bronze coupling operating without lubrication at 75,000 rpm. The simplicity and resilience of this technique for modifying steel–bronze pairs offer a ground-breaking and promising approach for a wide range of applications.

show abstract

Separation in liquid and the formation of supersaturated solid solutions in Fe–Cu alloys upon rapid laser melting

Cited by 12 publications

References 15 publications

Application of some inhibitors for improving the corrosion resistance of ceramic coatings deposited on non-alloy steel by short-pulse laser treatment

Application of some inhibitors for improving the corrosion resistance of ceramic coatings deposited on non-alloy steel by short-pulse laser treatment

Towards eliminating friction and wear in plain bearings operating without lubrication

Towards eliminating friction and wear in plain bearings operating without lubrication

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