Analysis of PTA hardfacing with CoCrWC and CoCrMoSi alloys

Scheid, Adriano; Oliveira, Ana Sofia Clímaco Monteiro de

doi:10.1590/s0104-92242013000400004

Cited by 19 publications

(12 citation statements)

References 5 publications

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“…The findings of this macroscopic evaluation are consistent with the prediction of the literature [8]. However, limited data are available regarding the interaction of the Tribaloy T400 with the substrate (dilution) and its effect on the chemical composition, microstructure and properties of the coatings [5,10].…”

Section: Visual Inspectionsupporting

confidence: 89%

“…Lower volume fraction of Laves phase is obtained reducing Chromium and Silicon content on the cast T400 alloy. So, higher ductility and toughness is obtained for tribaloy alloys, as previously reported [5][6][7][8].…”

Section: Bohatch Et Alsupporting

confidence: 83%

“…It might suggest that Iron, Chromium and Nickel contents variation due to dilution did not alter the developed phase, but just their proportion, following the same trend as observed recently on cast alloy, as shown in Figure 2 [5,7,10].…”

Section: Interaction With the Substrate And Microstructuresupporting

confidence: 75%

“…This alloy system can display a hypereutectic composition comprised of a primary Laves phase and a lamellar eutectic phase [5]. Tribaloy T400 alloy exhibits hypereutectic chemical composition and the microstructure is comprised of primary intermetallic Laves phase and lamellar eutectic.…”

Section: Bohatch Et Almentioning

confidence: 99%

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Influence of Processing on the Microstructure and Properties of CoCrMoSi Alloy PTA Coatings

et al. 2015

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Wear performance as well as the low toughness of CoCrMoSi alloys is associated with the presence of Laves phase. In light of this, alloying elements have been altered in order to reduce the brittleness of newly-cast alloys. This study evaluated coatings by Plasma Transferred Arc (PTA) with different interactions with the AISI 316L substrate. The higher the dilution, it was hypothesized, the higher Iron, Chromium and Nickel contents proceeding from substrate and, therefore, the lower hard Laves phase fraction. Coatings were characterized by light and scanning electron microscopy, X-ray diffraction and Vickers hardness. Wear behavior was assessed by pin-on-disc and ball-on-flat tests. Laves phase and Cobalt solid solution eutectic lamellar microstructure was observed for coating processed with 120A (18% dilution). The chemical composition was displaced to hypoeutectic, showing Cobalt solid solution dendrites and interdendrictic eutectic lamellar for the coatings processed with higher current intensity (150 / 180A), due to the higher interaction with the substrate (26 / 38% dilution). Dilution increased with the deposition current, causing hardness to decrease from 702 -526 HV 0.5 . Wear mass loss rate increased by up to 41.7% and friction coefficient (μ) ranged from 0.45 -1.06 as the chemical composition changed. Key-words:CoMoCrSi alloy; Plasma transferred arc; Dilution; Microstructure; Wear behavior. Influência do Processamento sobre a Microestrutura e Propriedades de Revestimentos da liga CoCrMoSi por PTAResumo: O desempenho em desgaste e a tenacidade das ligas CoCrMoSi estão associados à presença de fase de Laves. Neste sentido, o teor de elementos de liga vem sendo alterado para reduzir a fragilidade em algumas ligas recentemente propostas. O presente estudo avaliou revestimentos por Plasma com Arco Transferido (PTA) para diferentes graus de interação com o substrato de aço AISI 316L. Por hipótese, uma maior diluição promoverá maior teor de ferro, cromo e níquel oriundos do substrato e, portanto, uma menor fração de fase dura de Laves. Os revestimentos foram caracterizados por microscopia ótica e eletrônica e varredura, difração de raios-X e dureza Vickers. O comportamento em desgaste foi avaliado a partir de ensaios tipo pino sobre disco e esfera sobre superfície plana. Microestrutura eutética lamelar composta por fase Laves e solução sólida em Cobalto foi observada para a deposição com corrente de 120 A (18% diluição). A composição química foi deslocada para hipoeutética, mostrando dendritas de solução sólida em Cobalto e região eutética lamelar para os revestimentos depositados com correntes de 150 e 180 A (26 e 38% diluição). A diluição aumentou com a corrente e deposição, levando à redução na dureza de 702 -526 HV 0.5 . A taxa de perda de massa em desgaste aumentou em 41.7% enquanto o coeficiente de atrito (μ) variou entre 0.45 -1.06 à medida que a composição química foi alterada.Palavras-Chave: Liga CoMoCrSi; Plasma com arco transferido; Diluição; Microestrutura; Comportamento em desgaste.

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Section: Visual Inspectionsupporting

confidence: 89%

Section: Bohatch Et Alsupporting

confidence: 83%

Section: Interaction With the Substrate And Microstructuresupporting

confidence: 75%

Section: Bohatch Et Almentioning

confidence: 99%

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Influence of Processing on the Microstructure and Properties of CoCrMoSi Alloy PTA Coatings

et al. 2015

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“…The CoCrMoSi alloy system has shown better results under wear and corrosion-wear environments compared to carbides reinforced Co-based alloys. The superior performance is attributed to the presence of the hard intermetallic Laves phase in a lamellar eutectic and/or primary phase on the microstructure of the alloys (Laves phase is the Co, Mo and Si close-packed hexagonal (hcp) compound that can develop as Co 3 Mo 2 Si and/or CoMoSi) 5,6 . Even though better wear and corrosion-wear results are observed due to the presence of the Laves phase, the low ductility and toughness of the alloys still limit many applications.…”

Section: Introductionmentioning

confidence: 99%