The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Jaehyun Jung - One of the best experts on this subject based on the ideXlab platform.
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study on surface shape control of pure ti fabricated by electron beam melting using Electrolytic Polishing
Surface & Coatings Technology, 2017Co-Authors: Jaehyun Jung, Hyungki Park, Jaeho ChoiAbstract:Abstract Titanium parts in special industries such as vacuum, catalyst and medical application require a variety of surface properties with a unique structure for high efficiency. In this study, the unique surface of commercially pure titanium (CP Ti) parts fabricated using Electron Beam Melting (EBM) in the process of additive manufacturing is post-treated by the Electrolytic Polishing process under conditions ranging from 10 to 30 V and 10–600 s in order to study the surface characteristics. The possibility of controlling microstructural surface shape according to Electrolytic Polishing process conditions is presented from the increase of surface area through the formation of micro-dimples on protruding residual powder on the surface to the flattening of entire surface.
Jaeho Choi - One of the best experts on this subject based on the ideXlab platform.
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study on surface shape control of pure ti fabricated by electron beam melting using Electrolytic Polishing
Surface & Coatings Technology, 2017Co-Authors: Jaehyun Jung, Hyungki Park, Jaeho ChoiAbstract:Abstract Titanium parts in special industries such as vacuum, catalyst and medical application require a variety of surface properties with a unique structure for high efficiency. In this study, the unique surface of commercially pure titanium (CP Ti) parts fabricated using Electron Beam Melting (EBM) in the process of additive manufacturing is post-treated by the Electrolytic Polishing process under conditions ranging from 10 to 30 V and 10–600 s in order to study the surface characteristics. The possibility of controlling microstructural surface shape according to Electrolytic Polishing process conditions is presented from the increase of surface area through the formation of micro-dimples on protruding residual powder on the surface to the flattening of entire surface.
P. N. Belkin - One of the best experts on this subject based on the ideXlab platform.
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Influence of Plasma Electrolytic Polishing Conditions on Surface Roughness of Steel
Surface Engineering and Applied Electrochemistry, 2020Co-Authors: P. N. Belkin, S. V. Burov, S. A. Silkin, I. G. D’yakov, S. A. KusmanovAbstract:Anodic Polishing of St45 medium carbon steel (0.45 wt % C) and 12Cr18Ni10Ti austenitic stainless steel in aqueous electrolytes based on ammonium chloride or ammonium sulfate is studied under conditions of natural or force convection. Surface roughness, weight loss of the samples and the current resulted from Polishing are measured. A possibility of plasma Electrolytic Polishing using a setup for the anodic thermal chemical treatment of compounds with a longitudinal electrolyte flow is shown. Polishing regimes are found to decrease the initial surface roughness of the steels from R _ a = 1.0 to 0.19–0.22 μm in 5 minutes at a sample weight loss 0.5–0.7 mg/s. The minimal surface roughness is obtained using a 3% solution of ammonium chloride at a flow rate of 0.8 L/min, voltage of 300 V, and electrolyte temperature of 80°C.
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Enhancement of Wear and Corrosion Resistance in Medium Carbon Steel by Plasma Electrolytic Nitriding and Polishing
Journal of Materials Engineering and Performance, 2019Co-Authors: S. A. Kusmanov, I. V. Tambovskiy, S. S. Korableva, I. G. Dyakov, S. V. Burov, P. N. BelkinAbstract:The effect of plasma Electrolytic Polishing on the characteristics of medium carbon steel after anodic nitriding in a nitrate–chloride electrolyte was investigated. The structure, morphology, and phase composition of the layers were studied using an x-ray diffractometer and a metallographic microscope. Nitrided and polished specimens were tested under dry friction conditions with a counter-body made of bearing steel. Corrosion studies were performed using potentiodynamic polarization curves in 3% sodium chloride solution. Nitriding in a nitrate–chloride electrolyte was determined to increase the surface hardness up to 1040 HV due to the formation of a nitride–martensite layer with an outer oxide layer. After Polishing of the nitrided surface, the loose outer part of the oxide layer containing microcracks and pores was removed. The reduction in the corrosion current density of 2.27 times of nitrided steel by plasma Polishing without changing the structure of the diffusion layers was shown. The wear rate of the samples decreased from 560 μg/(N m) for untreated steel to 60 μg/(N m) as a result of nitriding and dropped to 8 μg/(N m) after plasma Electrolytic Polishing.
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aspects of anodic plasma Electrolytic Polishing of nitrided steel
Surface Engineering, 2019Co-Authors: S. A. Kusmanov, A V Zhirov, Irina Kusmanova, P. N. BelkinAbstract:ABSTRACTSteel surface can be polished after its plasma Electrolytic nitriding using the same electrolyser. Medium carbon steel is nitrided in the aqueous solution containing ammonium chloride and ammonium nitrate under stationary heating at 750°C for 5 min. The surface roughness is shown to decrease from 4.5 to 1.9 µm due to plasma Electrolytic Polishing during 2 min using the mode of current interruption without changing the structure of the diffusion layers.
S. A. Kusmanov - One of the best experts on this subject based on the ideXlab platform.
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Influence of Plasma Electrolytic Polishing Conditions on Surface Roughness of Steel
Surface Engineering and Applied Electrochemistry, 2020Co-Authors: P. N. Belkin, S. V. Burov, S. A. Silkin, I. G. D’yakov, S. A. KusmanovAbstract:Anodic Polishing of St45 medium carbon steel (0.45 wt % C) and 12Cr18Ni10Ti austenitic stainless steel in aqueous electrolytes based on ammonium chloride or ammonium sulfate is studied under conditions of natural or force convection. Surface roughness, weight loss of the samples and the current resulted from Polishing are measured. A possibility of plasma Electrolytic Polishing using a setup for the anodic thermal chemical treatment of compounds with a longitudinal electrolyte flow is shown. Polishing regimes are found to decrease the initial surface roughness of the steels from R _ a = 1.0 to 0.19–0.22 μm in 5 minutes at a sample weight loss 0.5–0.7 mg/s. The minimal surface roughness is obtained using a 3% solution of ammonium chloride at a flow rate of 0.8 L/min, voltage of 300 V, and electrolyte temperature of 80°C.
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Surface Modification of Steel by Anodic Plasma Electrolytic Boronitriding and Polishing
Materials Science Forum, 2019Co-Authors: S. A. Kusmanov, Vasiliy Belkin, Irina KusmanovaAbstract:The paper shows the possibility of plasma Electrolytic Polishing of the steel surface after its chemical-thermal treatment. Positive results of the plasma Electrolytic Polishing are obtained for low carbon steel after its anodic plasma Electrolytic boronitriding. An X-ray diffractometer and a scanning electron microscopy were used to characterize the phase composition of the modified layer and its surface morphology. Surface roughness was studied with the use of a roughness tester. The hardness of the treated and untreated samples was measured using a microhardness tester. Corrosion properties of the samples treated surfaces were evaluated using potentiodynamic polarisation tests in solution of sodium chloride. The reduction of the surface roughness of 1.7 times and the corrosion current density of 1.5 times of boronitrided steel by plasma Polishing using mode of current interruption for 2 min without changing the structure of the diffusion layers is shows.
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Enhancement of Wear and Corrosion Resistance in Medium Carbon Steel by Plasma Electrolytic Nitriding and Polishing
Journal of Materials Engineering and Performance, 2019Co-Authors: S. A. Kusmanov, I. V. Tambovskiy, S. S. Korableva, I. G. Dyakov, S. V. Burov, P. N. BelkinAbstract:The effect of plasma Electrolytic Polishing on the characteristics of medium carbon steel after anodic nitriding in a nitrate–chloride electrolyte was investigated. The structure, morphology, and phase composition of the layers were studied using an x-ray diffractometer and a metallographic microscope. Nitrided and polished specimens were tested under dry friction conditions with a counter-body made of bearing steel. Corrosion studies were performed using potentiodynamic polarization curves in 3% sodium chloride solution. Nitriding in a nitrate–chloride electrolyte was determined to increase the surface hardness up to 1040 HV due to the formation of a nitride–martensite layer with an outer oxide layer. After Polishing of the nitrided surface, the loose outer part of the oxide layer containing microcracks and pores was removed. The reduction in the corrosion current density of 2.27 times of nitrided steel by plasma Polishing without changing the structure of the diffusion layers was shown. The wear rate of the samples decreased from 560 μg/(N m) for untreated steel to 60 μg/(N m) as a result of nitriding and dropped to 8 μg/(N m) after plasma Electrolytic Polishing.
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aspects of anodic plasma Electrolytic Polishing of nitrided steel
Surface Engineering, 2019Co-Authors: S. A. Kusmanov, A V Zhirov, Irina Kusmanova, P. N. BelkinAbstract:ABSTRACTSteel surface can be polished after its plasma Electrolytic nitriding using the same electrolyser. Medium carbon steel is nitrided in the aqueous solution containing ammonium chloride and ammonium nitrate under stationary heating at 750°C for 5 min. The surface roughness is shown to decrease from 4.5 to 1.9 µm due to plasma Electrolytic Polishing during 2 min using the mode of current interruption without changing the structure of the diffusion layers.
Hyungki Park - One of the best experts on this subject based on the ideXlab platform.
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study on surface shape control of pure ti fabricated by electron beam melting using Electrolytic Polishing
Surface & Coatings Technology, 2017Co-Authors: Jaehyun Jung, Hyungki Park, Jaeho ChoiAbstract:Abstract Titanium parts in special industries such as vacuum, catalyst and medical application require a variety of surface properties with a unique structure for high efficiency. In this study, the unique surface of commercially pure titanium (CP Ti) parts fabricated using Electron Beam Melting (EBM) in the process of additive manufacturing is post-treated by the Electrolytic Polishing process under conditions ranging from 10 to 30 V and 10–600 s in order to study the surface characteristics. The possibility of controlling microstructural surface shape according to Electrolytic Polishing process conditions is presented from the increase of surface area through the formation of micro-dimples on protruding residual powder on the surface to the flattening of entire surface.