Surface hardening of metallic alloys by electrospark deposition followed by plasma nitriding

Béjar, M.A.; Schnake, W.; Saavedra, W.; Vildosola, J

doi:10.1016/j.jmatprotec.2006.03.162

Cited by 22 publications

(10 citation statements)

References 9 publications

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“…ESA treatment of titanium alloys using a steel electrode with subsequent surface carbonization leads to 100% higher hardness due to the increased content of titanium carbide in the surface layer [20]. Application of nitriding in plasma [21] as a post-treatment allows one to increase the material's hardness by nearly 100%, as compared to the vanilla single-stage ESA technology. Another branch of ESA-related research is the fabrication of multilayered coatings using a combination of ESA and magnetron sputtering methods [22,23].…”

Section: Introductionmentioning

confidence: 99%

Two-Layer Nanocomposite TiC-Based Coatings Produced by a Combination of Pulsed Cathodic Arc Evaporation and Vacuum Electro-Spark Alloying

Kiryukhantsev-Korneev

Сытченко

Sheveyko

et al. 2020

Materials

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A novel two-stage technology combining vacuum electro-spark alloying (VESA) and pulsed cathodic arc evaporation (PCAE) was approbated for the deposition of TiC-based coatings in inert (Ar) and reactive (C2H4) atmospheres. The deposition was carried out using a TiC-NiCr-Eu2O3 electrode and 5140 steel substrates. Structural, elemental, and phase compositions of the deposited coatings were investigated by scanning electron microscopy, energy-dispersive spectrometry, and X-ray diffraction. The mechanical properties of the coatings were measured by nanoindentation using a 4 mN load. The tribological properties of the coatings were measured using the pin-on-disc setup in air and in distilled water at a 5 N load. The experimental data suggest that VESA coatings are characterized by surface defects, a hardness of 12.2 GPa, and a friction coefficient of 0.4. To ensure good adhesion between the VESA coating and the upper layer containing diamond-like carbon (DLC), an intermediate layer was deposited by PCAE in the Ar atmosphere. The intermediate layer had a hardness of up to 31 GPa. The upper layer of the coating ensured a low and stable friction coefficient of 0.2 and high wear resistance due to the formation of an sp2–sp3 bound carbon phase. Multilayer TiC-based coating with the upper DLC layer, in addition to high tribological properties, was characterized by the lowest corrosion current density (12 μA/cm2).

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Section: Introductionmentioning

confidence: 99%

Two-Layer Nanocomposite TiC-Based Coatings Produced by a Combination of Pulsed Cathodic Arc Evaporation and Vacuum Electro-Spark Alloying

Kiryukhantsev-Korneev

Сытченко

Sheveyko

et al. 2020

Materials

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“…It is important to further improve the properties of the laser-reshaped mould parts for enhancing the reliability and the lifetime of the reshaped mould parts. Previous investigations have proved that duplex treatments can effectively enhance the performance of mould parts [8][9][10][11] . Laser cladding can re ne coating grains resulting in producing more substructures, such as dislocations 12) ; thus high volume interfaces between grains facilitate rapid diffusion of nitrogen element and facilitate chemical heat treatment on material surface.…”

Section: Introductionmentioning

confidence: 99%

Characteration of Laser Cladded Fe-Mn-Cr Alloy Coatings Modified by Plasma Nitriding

et al. 2016

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With the use of the high-performance precision mould, the requirements on the high speed, high reliable mould parts become more and more stringent. In order to further improve the surface wear resistance of moulds, Fe-Mn-Cr alloy coatings was prepared by a duplex treatment consisting of laser cladding followed by plasma nitriding. A dense structure coating with no cracks, pores or other defects were obtained after the duplex treatment, presenting a good metallurgical bonding to the substrate. After the duplex treatment, a nitride-layer of ξ-Fe 2 N+Cr 2 N and α-Fe with nitrogen were formed on the coating surface. The in uence of the duplex treatment on the hardness and wear resistance of the cladding layer were investigated. The hardness of the coating signi cantly increased, with an average microhardness of 1788 HV, which ensured the wear resistance of the coating. Comparing with laser cladded coating, the samples with duplex treated coating dropped about 41% in wear rate, and performed a better wear resistance. The main wear mechanism of the samples with duplex treated coating was abrasive wear.

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“…The electro-spark process of depositing hard layer can improve the mechanical properties of the tool surface and re-establish worn-out surfaces of the machine elements to extend their service life. Additionally, a joints application of ESD was proved to be successful by attachment of alloy stainless steels, and dissimilar material attachment between refractory metals and cast Ni-based superalloys [10][11][12][13] . In this work, the cobalt-based Stellite 6 (Co-Stellite 6) alloy was deposited on 45 carbon steel by ESD.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and tribological properties of cobalt-based Stellite 6 alloy coating by electro-spark deposition

Jing

Tan

2013

Mat. Res.

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The cobalt-based Stellite 6 coating with a thickness of 0.5 mm was deposited onto 45 carbon steel by electro-spark deposition technology. Microstructure, chemical composition, phase composition, microhardness distribution and wear resistance of the coating were researched by a series of experiments. The results indicate that, the coating with refined and compact microstructure is mainly composed of Co, Cr 7 C 3 , Co 6 W 6 C and CrCo. The coating makes metallurgical bonding interface with the substrate. Microhardness of the coating is improved significantly with an average value of 827.9 HV 0.5 , which is about 3.6 times that of the substrate. Under the same experimental condition, mass loss of the substrate is about 4.2-4.5 times that of the coating, so the coating shows excellent wear resistance. Main wear mechanism of the coating is abrasive wear at low speed or low load stage, and fatigue wear at high speed or heavy load condition.

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Surface hardening of metallic alloys by electrospark deposition followed by plasma nitriding

Cited by 22 publications

References 9 publications

Two-Layer Nanocomposite TiC-Based Coatings Produced by a Combination of Pulsed Cathodic Arc Evaporation and Vacuum Electro-Spark Alloying

Two-Layer Nanocomposite TiC-Based Coatings Produced by a Combination of Pulsed Cathodic Arc Evaporation and Vacuum Electro-Spark Alloying

Characteration of Laser Cladded Fe-Mn-Cr Alloy Coatings Modified by Plasma Nitriding

Microstructure and tribological properties of cobalt-based Stellite 6 alloy coating by electro-spark deposition

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