Characteristics of Tribaloy T-800 and T-900 coatings on steel substrates by laser cladding

Tobar, M.J.; Amado, J.M.; Álvarez, Carlos Luis Molpeceres; Garcı́a, Ana; Varela, Á.; Yáñez, A.

doi:10.1016/j.surfcoat.2007.11.025

Cited by 53 publications

(27 citation statements)

References 13 publications

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“…For this reason, the carbon content in tribaloy alloys is kept low to prevent carbides forming in preference to the Laves phase 7 . It can also justify the fact that microstructure and mechanical properties of CoCrMoSi alloys have been extensively studied as coatings on low-Carbon AISI 316L stainless steel substrate [11][12][13][14][15][16] . As a result, however, there is limited information about processing of these complex alloys on low-cost high-carbon content substrates such as cast irons (Fe-C-Si alloys).…”

Section: Introductionmentioning

confidence: 96%

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: Introductionmentioning

confidence: 96%

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

et al. 2018

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“…[6][7][8][9][10] In the present work, a Phynox Co based alloy [Co-20?45Cr-15?1Ni-14?1Fe-7?1Mo-1?85Mn-0?43Si-0?4Ti (wt-%)] is investigated under high temperature oxidation conditions. The Phynox substrate is an iron containing alloy.…”

Section: Introductionmentioning

confidence: 99%

Oxidation mechanism of cobalt based alloy at high temperatures (800–1100°C)

Buscail

Riffard

Issartel

et al. 2012

Corrosion Engineering, Science and Technology

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A cobalt based Phynox alloy has been oxidised in the 800-1100uC temperature range. Kinetic results show that the parabolic behaviour is followed under isothermal conditions. The scale growth mechanism of cobalt based Phynox alloy in air is consistent with a growth mechanism limited by the diffusion process in a growing Cr 2 O 3 oxide scale. Thermal cycling tests show that the best scale adherence is found at 1000uC. This temperature permits a rapid chromium supply from the substrate to form a continuous chromia scale. A keying effect at the internal interface is promoted by the presence of silicon and molybdenum. At 900uC, CoCr 2 O 4 cobalt containing oxide formation is favoured and leads to a bad scale adherence. At 1100uC, thermal cycling conditions lead to scale spallation and chromium depletion. Then, important weight losses are registered corresponding to the oxidation of cobalt and molybdenum to induce CoCr 2 O 4 and CoMoO 4 formation. IntroductionCobalt based alloys are widely used as wear resistant and corrosion resistant materials for industrial application in molten glasses, 1-4 in the presence of a deposit of salt or ash 5 or for gas turbine applications. 6-10 In the present work, a Phynox Co based alloy [Co-20?45Cr-15?1Ni-14?1Fe-7?1Mo-1?85Mn-0?43Si-0?4Ti (wt-%)] is investigated under high temperature oxidation conditions. The Phynox substrate is an iron containing alloy. The effect of iron additions in the range 5-15 wt-% on the microstructure and properties of two Co-Mn-Cr-Si wear resistant alloys (Tribaloys T400 and T800) has been investigated. 11 Iron additions were found to stabilise the fcc form of the cobalt solid solution, to give a fully eutectic matrix and to decrease the volume fraction of the primary laves phase. These microstructural modifications have little effect on the strain fracture toughness but result in a significant increase in the modulus of rupture. The addition of iron induces only minor changes in the corrosion and oxidation resistance. Zhang et al. have studied the oxidation behaviour of a Co based Tribaloy T-800 [Co-17?5Cr-28?5Mo-3?4Si (wt-%)] exposed isothermally in air at 800 and 1000uC. 12 Results have indicated that the oxidation mechanism was dependent on the exposure temperature. The oxidation of the alloy followed subparabolic oxidation kinetics at 800uC. The oxide scale at this temperature exhibited a multilayered structure, including an outer layer of cobalt oxide, a layer composed of complex oxide and spinel, a non-uniform Mo rich oxide layer, an intermediate mixed oxide layer and an internal attacked layer with different protrusions into the laves phase. During 1000uC exposure, mass gain followed linear kinetics. The oxidation rendered a relatively uniform external Cr rich oxide layer coupled with a thin layer of spinel on the top surface and voids at the scale/alloy interface and intergranular region together with internal Si oxide at 1000uC.In the literature, no papers are available on the reaction mechanisms during the Co based Phynox oxidation at high tempera...

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“…Co-based Tribaloy Ò1 alloys are a group of superalloys used extensively as wearresistant and corrosion-resistant coating materials for industrial turbine applications [1][2][3]. A typical Tribaloy alloy is T-800 (Co-17.5Cr-28.5Mo-3.4Si, wt.%) which is employed for better abrasive wear resistance at service temperatures as high as 800°C.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Tribaloy T-800 Alloy at 800 and 1,000 °C

et al. 2008

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The oxidation behavior of Co-based Tribaloy T-800 alloy has been studied isothermally in air at 800 and 1,000°C, respectively. The results showed that the oxidation mechanism was dependent on the exposure temperature. The oxidation of the alloy followed subparabolic oxidation kinetics at 800°C. The oxide scale at this temperature exhibited a multi-layered structure including an outer layer of Co oxide, a layer composed of complex oxide and spinel, a nonuniform Mo-rich oxide layer, an intermediate mixed oxides layer and an internal attacked layer with different protrusions into Laves phase. During 1,000°C exposure, it followed linear kinetics. The oxidation rendered a relatively uniform external Cr-rich oxide layer coupled with a thin layer of spinel on the top surface and voids at local scale/alloy interface and intergranular region together with internal Si oxide at 1,000°C.

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Characteristics of Tribaloy T-800 and T-900 coatings on steel substrates by laser cladding

Cited by 53 publications

References 13 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

Oxidation mechanism of cobalt based alloy at high temperatures (800–1100°C)

Oxidation Behavior of Tribaloy T-800 Alloy at 800 and 1,000 °C

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