Effects of plasma nitriding on mechanical and tribological properties of CoCrMo alloy

Çelik, A.; Bayrak, Özgü; Alsaran, Akgün; Kaymaz, İrfan

doi:10.1016/j.surfcoat.2007.08.030

Cited by 54 publications

(31 citation statements)

References 6 publications

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“…Forged CoCrMo alloy presented friction coefficient (μ) varying from 1.0 and 1.1 against ceramic ball, while cast T400C alloy presented 0.6 [14][15][16].…”

Section: Influence Of Processing On the Microstructure And Propertiesmentioning

confidence: 99%

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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“…Forged CoCrMo alloy presented friction coefficient (μ) varying from 1.0 and 1.1 against ceramic ball, while cast T400C alloy presented 0.6 [14][15][16].…”

Section: Influence Of Processing On the Microstructure And Propertiesmentioning

confidence: 99%

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

et al. 2015

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“…c o m . c n CCM1 0 0 0 0 0 15 Cast CoCrMo CCM2 600 2.4 460 500 9 62 Cast CoCrMo CCM3 700 3.7 520 500 9 103 Cast CoCrMo CCM4 800 5.0 580 500 9 165 reported [13][14][15][16] . In the present study, plasma nitriding method has been used to form wear resistance and protective layer on surface of cast CoCrMo alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Tribological Properties of Plasma Nitriding Cast CoCrMo Alloy

Wang

Huang

Zhang

2012

Journal of Materials Science & Technology

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“…Few studies report the treatments of CoCrMo alloys by means of ion implantation [6][7][8], plasma nitriding [9][10][11][12][13] or plasma based ion implantation (PBII) [13][14][15][16]. In order to conserve the intrinsic good corrosion resistance, the nitriding has to avoid CrN precipitates or layer formation.…”

Section: Introductionmentioning

confidence: 99%

“…γ phase, similar to the one obtained with stainless steel nitriding. Although these surface treatment methods are found to be profitable for wear resistance [9,11], the cobalt ion release seems to be increased by the treatments compared to the initial substrate [7]. By increasing the temperature (600 to 800°C), CrN and Cr 2 N are detected by X-ray diffraction.…”

Section: Introductionmentioning

confidence: 99%

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CoCrMo alloy treated by floating potential plasma assisted nitriding and plasma based ion implantation: Influence of the hydrogen content and of the ion energy on the nitrogen incorporation

Pichon

Okur

Öztürk

et al. 2010

Surface and Coatings Technology

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Nitriding was performed on a medical grade CoCrMo alloy at 400°C in N 2 or N 2 -H 2 atmosphere at a working pressure of 0.84 Pa for 2 h. Various surface treatment techniques were used to incorporate nitrogen into the CoCrMo alloy: without any plasma assistance, by floating potential radio-frequency plasma assisted nitriding (FPPAN), by plasma based ion implantation (PBII) with several high voltage accelerations (up to 20 kV). Without plasma activation, no nitrogen is incorporated in the CoCrMo. On the contrary, all the plasma or PBII treated samples show the formation of a nitrogen-rich f.c.c. γ N phase. The layer nitrided over few microns has a nitrogen composition ranging from 30 at.% to about 20 at.% near the nitrided layer-substrate interface, with an enhanced surface microhardness. Hydrogen is found to enhance the nitriding efficiency. Without hydrogen, a high voltage polarization provides a supplementary amount of implanted nitrogen available for further diffusion and the sputtering of the surface passive oxide. So, with limited high voltages, thicker layers with higher amounts of nitrogen can be achieved by PBII compared to plasma nitriding. However, with higher voltages, the sputtering becomes too important and the nitride layer is thinner.

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Effects of plasma nitriding on mechanical and tribological properties of CoCrMo alloy

Cited by 54 publications

References 6 publications

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

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

Microstructure and Tribological Properties of Plasma Nitriding Cast CoCrMo Alloy

CoCrMo alloy treated by floating potential plasma assisted nitriding and plasma based ion implantation: Influence of the hydrogen content and of the ion energy on the nitrogen incorporation

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