Evaluation of hard coatings obtained on AISI D2 steel by thermo-reactive deposition treatment

Oliveira, C.K.N.; Benassi, C.L.; Casteletti, Luíz Carlos

doi:10.1016/j.surfcoat.2006.03.036

Cited by 71 publications

(51 citation statements)

References 23 publications

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“…The microstructure of as-cast high speed steels, consists of a matrix and eutectic carbides heterogeneously distributed in the interdendritic regions 6,7 . The surface treatments allows to meet a wider range of parts requirements, such as increased hardness in combination with good toughness 8 . The boriding is a thermochemical treatment technique used in many areas of engineering processes of metals, where the boron atoms are diffused in the surface to form borides with the base metal [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

“…The surface treatments allows to meet a wider range of parts requirements, such as increased hardness in combination with good toughness 8 . The boriding is a thermochemical treatment technique used in many areas of engineering processes of metals, where the boron atoms are diffused in the surface to form borides with the base metal [8][9][10] . The boron atoms owing to its relatively small size and high mobility can diffuse into the substrate.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Boride Layer on PM HSS AISI M2 on the Mechanisms Acting in the Transverse Rupture Strength Test

et al. 2017

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Herein, it was conducted a study in order to examine the main fracture characteristics in the transverse rupture strength test (TRS) of a high speed steel (HSS) AISI M2 produced by powder metallurgy (PM) and with boriding treatment. Four conditions have been studied: as-sintered, borided, normalized and borided + TiN. The TRS tests were conducted in accordance with ASTM B528-12 standard. Density, Vickers hardness and transverse rupture strength properties were evaluated. Fractography was observed by scanning electron microscope (SEM). TRS test in the as-sintered condition had the best performance. The fractography of samples showed very irregular appearance, with interconnected porosity for the matrix of the samples and the boride layer had a smooth surface with low porosity. It was observed on the boride layer, the growth of boride layers inside the pores, filling them, which is a positive factor on the TRS. However, cracks were observed in the FeB/Fe 2 B interface of boride layer, which embrittle the material and reduce the TRS. In fractography of borided samples, it is observed that two fracture modes occur, mode I and mode II. This should be explained owing to the difference between the elasticity modulus of FeB and Fe 2 B interface.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Boride Layer on PM HSS AISI M2 on the Mechanisms Acting in the Transverse Rupture Strength Test

et al. 2017

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“…An economical alternative has been the application of hard coatings with good wear resistance using the thermo-reactive diffusion deposition process (TRD) [3] on substrates containing a carbon percentage higher than 0.3% by weight [4]. The coatings that have been grown using this process exhibit good adhesion to the substrate, a low friction coefficient, and excellent thickness uniformity [5].…”

Section: Introductionmentioning

confidence: 99%

“…In studies published to date, binary metal carbides have deposited through TRD process and their wear resistance, microstructure, and mechanical behavior have been characterized. For example, several studies focused on the production of coatings of vanadium carbide and niobium carbide on steel AISI H13, AISI, AISI D2, and M2 substrates, which have been reported as producing up to 2300 HV hardness [3,5].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and wear behavior of niobium-vanadium carbide coatings produced on AISI H13 tool steel through thermo-reactive deposition/diffusion

Castillejo

Flórez

Orjuela

2016

Ingeniare. Rev. chil. ing.

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We deposited of niobium-vanadium carbide coatings on tool steel AISI H13 using the thermo-reactive substrates deposition/diffusion (TRD) technique. The carbides were obtained using salt baths composed of molten borax, ferroniobium, vanadium and aluminum, by heating this mixture at 1020° C for 4 hours. The coatings were characterized morphologically via electron microscopy scanning (SEM), the chemical surface composition was determined through X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX); the crystal structure was analyzed using x-ray diffraction (XRD), the mechanical properties of the coatings were evaluated using nano-indentation, The tribological properties of the coatings obtained were determined using a Pin-on-disk tribometer and the electrochemical behavior was studied through potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that the hardness of the coated steel increased four times with respect to uncoated steel, and the electrochemical test established that the corrosion current is lower by one order of magnitude for coated steel.Keywords: Coatings, thermo reactive, niobium-vanadium carbide, spectroscopy, impedance. RESUMEN En este trabajo se depositaron recubrimientos de carburo de niobio-vanadio sobre aceros para herramientas AISI H13 utilizando la técnica de depósito por difusión termorreactiva (TRD). Los carburos se obtuvieron utilizando baños de sales compuestas de bórax fundido, ferroniobio, vanadio y aluminio, calentando la mezcla a 1020 °C durante 4 horas. Los recubrimientos fueron caracterizados morfológicamente mediante microscopia electrónica de barrido (SEM), la composición química de la superficie se determinó mediante espectroscopia de fotoelectrones de rayos X (XPS) y la espectroscopia de rayos X de energía dispersiva (EDX); la estructura cristalina se analizó utilizando difracción de rayos X (XRD), las propiedades mecánicas de los recubrimientos fueron evaluados utilizando nanoindentación. Las propiedades tribológicas de los recubrimientos obtenidos fueron determinadas usando un tribómetro Pin on Disk CETR-UMC-2 y el comportamiento electroquímico se estudió por medio de curvas de polarización potenciodinámica y espectroscopia de impedancia electroquímica (EIS). Los resultados mostraron que la dureza del acero revestido aumentó cuatro veces respecto del acero no recubierto, y la prueba electroquímica estableció que la corriente de corrosión es inferior en un orden de magnitud para el acero recubierto.Palabras clave: Recubrimientos, termorreactiva, carburo de niobio-vanadio, espectroscopia, impedancia.

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“…A competitive and economical alternative is the application of hard coatings with good wear resistance by a thermoreactive deposition/diffusion process (TRD) [3] on substrates containing a carbon percentage higher than 0.3% by weight [4]. The layers deposited by this process exhibit good adhesion to the substrate, low coefficients of friction and excellent uniformity in thickness [5]. For this treatment, a salt bath composed of molten borax, aluminum, or ferrosilicon can be used as a reducing agent, along with carbide forming elements (CFE's), such as vanadium, chromium, titanium, and niobium [4].…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of niobium carbide coatings produced on tool steels by thermoreactive deposition/diffusion

Castillejo

Marulanda

Olaya

2014

Ingeniare. Rev. chil. ing.

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RESUMENEn este trabajo se depositaron recubrimientos de carburo de niobio sobre aceros AISI M2, H13 y D2, utilizando la técnica de deposición por difusión termorreactiva. Los carburos se obtuvieron usando baños de sales compuestos por bórax fundido, ferroniobio, ferrovanadio y aluminio a una temperatura de 1.020 °C durante 4 horas. La presencia de los recubrimientos fue observada por microscopia electrónica de barrido. Las fases fueron determinadas usando difracción de rayos X, y se utilizó microdureza para determinar la dureza. El comportamiento electroquímico fue estudiado mediante curvas de polarización potenciodinámica para determinar la densidad de corriente de corrosión, y espectroscopia de impedancia electroquímica para determinar la resistencia a la polarización. Los resultados fueron comparados con las propiedades del sustrato sin recubrimiento y en general se observó mayor dureza y mejor resistencia a la corrosión en los recubrimientos producidos.Palabras clave: Difusión, carburos de niobio, impedancia, aceros para herramientas, corrosión. ABSTRACTIn this work, niobium carbide coatings were deposited on AISI M2, H13, and D2 tool steels by thermoreactive deposition/diffusion. The carbides were obtained using salt baths composed of molten borax, aluminum, and ferroniobium at a temperature of 1020 °C for 4 hours. The coatings were observed via scanning electron microscopy. The phases were determined using X-ray diffraction, and Vickers indentation was used to determine the hardness. The electrochemical behavior was studied via potentiodynamic polarization curves to determine the rate of corrosion and electrochemical impedance spectroscopy was used to determine the resistance to polarization. The results were compared with the properties of the substrate without a coating, and in general, greater hardness and better corrosion resistance were observed with the coatings.

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Evaluation of hard coatings obtained on AISI D2 steel by thermo-reactive deposition treatment

Cited by 71 publications

References 23 publications

Effect of Boride Layer on PM HSS AISI M2 on the Mechanisms Acting in the Transverse Rupture Strength Test

Effect of Boride Layer on PM HSS AISI M2 on the Mechanisms Acting in the Transverse Rupture Strength Test

Electrochemical and wear behavior of niobium-vanadium carbide coatings produced on AISI H13 tool steel through thermo-reactive deposition/diffusion

Production and characterization of niobium carbide coatings produced on tool steels by thermoreactive deposition/diffusion

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