Microstructure and Properties of Nickel-based C276 Alloy Coatings by PTA on AISI 316L and API 5L X70 Steel Substrates

Ferreira, Luciano da Silva; Graf, Karin; Scheid, Adriano

doi:10.1590/1516-1439.332914

Cited by 21 publications

(32 citation statements)

References 14 publications

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“…Thus, to promote distinct dilution, coatings were prepared by PTA-P as single beads with four distinct deposition currents: 120, 150, 180 and 200 A. The procedure is in agreement with previous experience and results presented in the literature for such an approach 11,13,24,[26][27][28] . Table 2 shows the main deposition parameters utilized.…”

Section: Methodssupporting

confidence: 79%

Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

et al. 2018

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The Laves phase reinforced CoCrMoSi alloy system has emerged as a candidate material to protect the surface of components to withstand harsh environments under wear and/or corrosion. However, previous reports have raised some concerns and restricted a wider selection of iron-based substrates to be coated, especially limiting the carbon content. This work aims to outline the Laves -Carbides phases in the microstructure and its effect on the properties of T400 alloy deposited on GGG40 ductile iron. Dilution of 26 % ensured Laves formation either as primary or secondary, due to high-silicon substrate selected. Departing from 41 % dilution, the alloy changed to a completely carbide strengthened system. Therefore, for the lowest dilution the coatings hardness is dictated by Laves phase whereas, for higher ones, carbides are the most influent phases.

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Section: Methodssupporting

confidence: 79%

Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

et al. 2018

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“…The EDS map scan in Figure (b) shows the segregation of tungsten in the Ni–FCC ( γ phase), where the dendritic core regions are W rich with less Ni content compared to the inter‐dendritic region. This phenomenon has been observed in the alloys under study with more than 3 at% W, which, according to the literature, could be due to the tendency for tungsten segregation under non‐equilibrium solidification conditions . The reason that this effect is not seen for 1 at% W, is the fact that by decreasing the W content, the γ phase becomes more stable and less prone to the segregation and precipitation of carbide phases .…”

Section: Resultssupporting

confidence: 61%

“…While the etchant has not revealed many details of the microstructure, certain features are visible, as shown by arrows. Further EDS analysis shown in Figure suggests the features to be carbides of tungsten which according to the literature could be WC, W 6 C, or W 23 C . However, for simplicity, we will refer to them as WC from now on.…”

Section: Resultsmentioning

confidence: 93%

Effect of tungsten alloying on passivity breakdown of nickel

Al‐Sahli¹,

Ghanbari²,

Macdonald³

2018

Materials & Corrosion

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The addition of small amounts of tungsten (W) on the passivity breakdown of nickel (Ni) in borate buffer solutions as a function of chloride activity, pH, and voltage sweep rate has been evaluated and the data are interpreted in terms of the point defect model (PDM). The critical pitting potential of Ni–W alloys was found to become more positive (correspondingly a higher resistance to pitting) upon increasing the W content up to 3 at.% but decreases with further additions. The initial increase in the breakdown voltage with increasing [W] is attributed to changes in the diffusivity of the cation vacancy, the electric field strength, the annihilation rate of cation vacancies (Jm), changes in the standard Gibbs energy of adsorption of Cl− into surface oxygen vacancies, and in the standard Gibbs energy of generation of Schottky pairs, as predicted by the SVIM. At high [W] (4–5 at.%), it is postulated that all of the mobile cation vacancies are complexed with immobile WNi4⋅ [W(VI) cation substituted onto the Ni(II) vacancy of the cation sublattice of the barrier layer], so that further additions of W are predicted to have little positive effect in improving the pitting resistance of the alloy. Instead, W additions above 3% are postulated to increase the population density of breakdown sites on the surface via the formation of intermetallic precipitates, which has the effect of displacing the distribution in the breakdown voltage in the negative direction.

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“…Moreover, the hardfacing of steel substrates has been considered for their attractive properties and relatively low cost. In fact, dilution should be kept as low as possible, since higher dilution induces a decrease in hardness often associated with microstructure changes, that is, a lower fraction of strengthening carbides and lower alloying in the Co-SS 8,[11][12][13][14][15] . Halstead and Rawlings 16 have investigated the effect of iron additions on Co-based alloys microstructure, and many recent welding papers 8,12,14,15 have confirmed a larger fraction of Co-rich solid solution phase as higher dilution in the steel substrate is achieved 8 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Bead Overlapping on the Microstructure and Mechanical Properties of CoCrWC Alloy Coatings

et al. 2018

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In order to protect industrial components, cobalt base alloys are applied as hardfacing material through welding techniques. A large number of papers have shown that controlling the chemical composition is a key point regarding the wear and corrosion resistance of coatings. This paper investigated the effect of bead overlapping on the microstructure and properties of CoCrWC alloy coatings. Mechanical properties were determined by hardness, sliding wear and microtensile tests. Bead overlapping reduces dilution during the previous bead melting, which in turn induces lower iron content. From the second bead on, an increase in the amount of interdendritic carbides and solid solution alloying was verified, accounting for the higher mechanical properties of the coatings.

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Microstructure and Properties of Nickel-based C276 Alloy Coatings by PTA on AISI 316L and API 5L X70 Steel Substrates

Cited by 21 publications

References 14 publications

Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

Effect of Dilution on the Microstructure and Properties of CoCrMoSi alloy Coatings Processed on High-Carbon Substrate

Effect of tungsten alloying on passivity breakdown of nickel

Effect of Bead Overlapping on the Microstructure and Mechanical Properties of CoCrWC Alloy Coatings

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