Effect of processing on microstructure and properties of CoCrMoSi alloy

Scheid, Adriano; D'Oliveira, Ana Sofia

doi:10.1590/s1516-14392013005000120

Cited by 11 publications

(11 citation statements)

References 9 publications

(12 reference statements)

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“…Results were in line with previous reports obtained on the cast CoCrMoSi T400 alloy [10]. Dilution increase from 18 -26% promoted an increase of 27.6% on wear mass loss rate and, finally, 38% dilution resulted in the increase of 41.7% on wear rate (Figure 8b).…”

Section: Influence Of Processing On the Microstructure And Propertiessupporting

confidence: 92%

“…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%

“…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: 76%

“…For the higher dilution (38%) of the coatings processed with 180 A, eutectic volume fraction decreased even more (6%) leading to the lowest hardness. Thus, the hardness was influenced first by the volume fraction of the hard phase (eutectic lamellar containing Laves phase) followed by the reduction of alloying in solid solution, following the same behavior previously observed on cast alloy [6,7,10]. Table 4.…”

Section: Bohatch Et Alsupporting

confidence: 67%

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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: Influence Of Processing On the Microstructure And Propertiessupporting

confidence: 92%

Section: Visual Inspectionsupporting

confidence: 89%

Section: Interaction With the Substrate And Microstructuresupporting

confidence: 76%

Section: Bohatch Et Alsupporting

confidence: 67%

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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 production of welded coatings must consider the interaction between the deposition alloy and the substrate, as higher dilution induces lower hardness of the coatings. This reduction in hardness has been attributed to several factors, including the participation of the chemical elements (such as iron, chromium and nickel) from the steel substrates [10][11][12] . Coatings are largely studied by way of dilution on single track deposits processed with different deposition current 10,11 .…”

Section: Introductionmentioning

confidence: 99%