Plasma Coating Formation by the Deposition of Cathode Material Eroded Through High-Current Pulsed Discharge

Chabak, Yu. G.; Fedun, V.I.; Ефременко, В. Г.; Пастухова, Т. В.; Efremenko, B.V.

doi:10.46813/2019-123-167

Cited by 9 publications

(5 citation statements)

References 21 publications

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“…There have been some reports regarding to the effect of Cu, Ni or Mn on the microstructure and properties of the Fe-B-C alloys [16][17][18][19]. However, their examined compositions have been limited up to 3 wt.…”

Section: Introductionmentioning

confidence: 99%

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Sukhova

2021

Phys. Chem. Solid St.

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In the present study, the microstructure development and mechanical properties of the cast boron-rich Fe–B–C alloys cooled at 10 and 103 K/s were investigated as functions of alloying elements additions. These alloys were prepared in the following compositional ranges: B (10–14 wt.%), C (0.1–1.2 wt.%), M (5 wt.%), where M – Cu, Ni or Mn, balance Fe. Structural properties were characterized by quantitative metallography, X-Ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. Mechanical properties of the structural constituents, such as microhardness and fracture toughness, were measured by a Vickers indenter. Copper becomes negligibly incorporated into the phases Fe(B,C) and Fe2(B,C) of the Fe–B–C alloys, but solubility limit forces the remaining solute into the residual liquid. As a result, the globular Cu inclusions are seen in the structure. As compared with copper, nickel has higher solubility in the constituent phases, with preferential solubility observed in the Fe2(B,C) crystals, where Ni occupies Fe positions. Having limited solubility, nickel also forms secondary Ni4B3 phase at the Fe2(B,C) boundaries. Manganese was found to dissolve completely in the Fe–B–C alloys forming substitutional solid solutions preferentially with Fe(B,C) dendrites. By entering into the iron borides structure, Mn and Ni improve their ductility but lower microhardness. The peculiarities in the structure formation and properties of the doped boron-rich Fe–B–C alloys were explained with electronic structure of the alloying elements considered.

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Section: Introductionmentioning

confidence: 99%

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Sukhova

2021

Phys. Chem. Solid St.

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“…The SLM specimen showed a wear rate of 90.35 ×10 -10 (m 3 ⋅N -1 ⋅m -1 ) that was 21 % lower than that of the wrought specimen. Presumably, this was caused by the 19 % advantage of SLM alloy in hardness that lowered the adhesion interaction [23]. The sliding in a liquid medium (SBF) led to a significant decrease in the wear loss.…”

Section: Resultsmentioning

confidence: 99%

Microstructure-Properties Characterization of Selective Laser Melted Biomedical Co-28Cr-6Mo Alloy

Efremenko

Zurnadzhy

Chabak

et al. 2023

MSF

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Co-28Cr-6Mo alloy (ASTM F75) is widely used in different biomedical applications (dental devices, orthopedic implants, etc.). Casting and metal forming are the two conventional technologies for the fabrication of this alloy. Recently, additive manufacturing has also been adopted. Due to the peculiarities of this technological process, 3D-printed alloys differ from traditionally manufactured alloys in their structure and properties. In the present work, the features of selective laser melted Co-28Cr-6Mo alloy were studied in comparison with its wrought analogue. The study included microstructural characterization (optical and electron scanning microscopy), nanoindentation, and tribological testing. It was shown that the SLM alloy featured the “fish-scale” structure, characteristic of additively fabricated alloys. This structure was composed of fine columnar dendrites. SLM Co-28Cr-6Mo was found equivalent or superior to the wrought alloy in terms of properties, such as hardness, elastic modulus and tribological behavior that makes SLM Co-28Cr-6Mo a promising candidate for implant applications.

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“…This validates the appropriateness of the minor addition of these elements into TRIP-assisted steel. However, Cr, Mo, and V are the elements that promote carbide formation [52]. They reduce carbon activity in austenite (a γ C ) [53,54], thus leveling the inhibiting effect of silicon.…”

Section: Discussionmentioning

confidence: 99%

Alternative Approach for the Intercritical Annealing of (Cr, Mo, V)-Alloyed TRIP-Assisted Steel before Austempering

Zurnadzhy

Ефременко

Petryshynets

et al. 2022

Metals

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TRIP-assisted С-Si-Mn steels are usually subjected to austempering with a preliminary intercritical annealing that is targeted at the multi-phase structure with 40–60 vol.% of proeutectoid ferrite. The kinetics and the mechanism of phase-structural transformations can be impacted due to the additional alloying of TRIP-assisted steel by the strong carbide forming elements, thus necessitating an alternative approach for the selection of intercritical annealing parameters. This issue is analyzed in the present work, which investigates the effect of the temperature of intercritical annealing on the “structure/properties” correlations in 0.2 wt.% C-Si-Mn-Nb steel additionally alloyed by 0.55 wt.% Cr, 0.20% Mo, and 0.11 wt.% V. The annealing temperature ranged from 770 °C to 950 °C, and austempering was performed at 350 °C for 20 min. It was observed that the addition of the (Cr, Mo, and V) complex significantly improved the steel hardenability. However, the annealing of steel at 770 °C (to gain 50 vol.% of proeutectoid ferrite) resulted in the precipitation of coarse cementite lamellas during bainite transformation, thus lowering the amount of retained austenite (RA) and decreasing the strength and ductility of the steel. At higher annealing temperatures, carbide-free bainite was formed, which presented a 2.5–3.5 times increase in the RA volume fraction and a 1.5 times increase in the RA carbon content. The optimal combination of the mechanical properties (UTS of 1040 MPa, TEL of 23%, V-notch impact toughness of 95 J/cm2, PSE of 23.9 GPa·%) referred to annealing at a temperature close to the Ac3 point, resulting in a structure with 5 vol.% ferrite and 9 vol.% RA (the residue was carbide-free bainite). This structure presented an extended manifestation of the TRIP effect with an enhanced strain hardening rate due to strain-induced martensite transformation. The impact of the alloying elements on the carbon activity in austenite served as the basis for the analysis of structure formation.

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Plasma Coating Formation by the Deposition of Cathode Material Eroded Through High-Current Pulsed Discharge

Cited by 9 publications

References 21 publications

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Solubility of Cu, Ni, Mn in Boron-Rich Fe-B-C Alloys

Microstructure-Properties Characterization of Selective Laser Melted Biomedical Co-28Cr-6Mo Alloy

Alternative Approach for the Intercritical Annealing of (Cr, Mo, V)-Alloyed TRIP-Assisted Steel before Austempering

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