The Experts below are selected from a list of 41439 Experts worldwide ranked by ideXlab platform
Yuan Zhou - One of the best experts on this subject based on the ideXlab platform.
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effect of cryogenic treatment on Wear resistance of ti 6al 4v alloy for biomedical applications
Journal of The Mechanical Behavior of Biomedical Materials, 2014Co-Authors: Kaixuan Gu, Junjie Wang, Yuan ZhouAbstract:Abstract The effect of cryogenic treatment on Wear resistance of Ti–6Al–4V alloy for biomedical applications was experimentally investigated in this paper. Cryogenic treatments with the same soaking time of 24 h at different temperatures of −80 °C, −140 °C and −196 °C were conducted and the treatments at the same temperature of −196 °C were then further given different soaking time of 3 h, 48 h and 72 h to be investigated. After cryogenic treatment, the Vickers hardness of specimens was measured. Wear resistance of Ti–6Al–4V alloy was measured by Pin-on-Disk Wear Test under dry sliding condition. The results demonstrated that the Vickers hardness increased slightly with the reduction of temperature while it increased obviously with the elongation of soaking time at −196 °C. The friction coefficients of specimens cryo-treated at −196 °C were lower than those of untreated and of cryo-treated at −80 °C and −140 °C. And the longer the soaking time is during the cryogenic treatment, the higher the friction coefficient reduction can be achieved. The obvious reduction of mass loss can be obtained at −196 °C with 72 h soaking. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to detect the microstructure and worn surface of specimens. By cryogenic treatment, the plowing in the worn surface was smoothed and shallowed, and the degree of plastic deformation in the subsurface was decreased. There was no obvious phase transformation which can be detected in the microstructure after cryogenic treatment. However, the tendency of refinement in grain size can be detected by XRD which improved the Wear resistance of Ti–6Al–4V alloy.
Kaixuan Gu - One of the best experts on this subject based on the ideXlab platform.
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effect of cryogenic treatment on Wear resistance of ti 6al 4v alloy for biomedical applications
Journal of The Mechanical Behavior of Biomedical Materials, 2014Co-Authors: Kaixuan Gu, Junjie Wang, Yuan ZhouAbstract:Abstract The effect of cryogenic treatment on Wear resistance of Ti–6Al–4V alloy for biomedical applications was experimentally investigated in this paper. Cryogenic treatments with the same soaking time of 24 h at different temperatures of −80 °C, −140 °C and −196 °C were conducted and the treatments at the same temperature of −196 °C were then further given different soaking time of 3 h, 48 h and 72 h to be investigated. After cryogenic treatment, the Vickers hardness of specimens was measured. Wear resistance of Ti–6Al–4V alloy was measured by Pin-on-Disk Wear Test under dry sliding condition. The results demonstrated that the Vickers hardness increased slightly with the reduction of temperature while it increased obviously with the elongation of soaking time at −196 °C. The friction coefficients of specimens cryo-treated at −196 °C were lower than those of untreated and of cryo-treated at −80 °C and −140 °C. And the longer the soaking time is during the cryogenic treatment, the higher the friction coefficient reduction can be achieved. The obvious reduction of mass loss can be obtained at −196 °C with 72 h soaking. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to detect the microstructure and worn surface of specimens. By cryogenic treatment, the plowing in the worn surface was smoothed and shallowed, and the degree of plastic deformation in the subsurface was decreased. There was no obvious phase transformation which can be detected in the microstructure after cryogenic treatment. However, the tendency of refinement in grain size can be detected by XRD which improved the Wear resistance of Ti–6Al–4V alloy.
Nizamettin Kahraman - One of the best experts on this subject based on the ideXlab platform.
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Wear behaviour of bulldozer rollers welded using a submerged arc welding process
Materials & Design, 2003Co-Authors: Behcet Gulenc, Nizamettin KahramanAbstract:Abstract The submerged arc welding process is commonly used due to its easy applicability, high current density and its ability to deposit a large amount of weld metal using more than one wire at the same time, especially in restoration of worn parts, which is of great importance to manufacturers. In this study, worn parts were welded using the submerged arc welding process. Various wires and fluxes were used for this purpose. These welded parts were subjected to Wear Tests under different loads, and changes in the hardness and microstructures were examined. A Pin-on-Disk Wear Test apparatus was used. The results showed that the hardest weld metal showed the highest Wear resistance, while the least hard weld metal showed the least Wear resistance. The weld hardness and Wear resistance obtained were found to be dependent on the chemical composition of the weld wire and flux.
Junjie Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of cryogenic treatment on Wear resistance of ti 6al 4v alloy for biomedical applications
Journal of The Mechanical Behavior of Biomedical Materials, 2014Co-Authors: Kaixuan Gu, Junjie Wang, Yuan ZhouAbstract:Abstract The effect of cryogenic treatment on Wear resistance of Ti–6Al–4V alloy for biomedical applications was experimentally investigated in this paper. Cryogenic treatments with the same soaking time of 24 h at different temperatures of −80 °C, −140 °C and −196 °C were conducted and the treatments at the same temperature of −196 °C were then further given different soaking time of 3 h, 48 h and 72 h to be investigated. After cryogenic treatment, the Vickers hardness of specimens was measured. Wear resistance of Ti–6Al–4V alloy was measured by Pin-on-Disk Wear Test under dry sliding condition. The results demonstrated that the Vickers hardness increased slightly with the reduction of temperature while it increased obviously with the elongation of soaking time at −196 °C. The friction coefficients of specimens cryo-treated at −196 °C were lower than those of untreated and of cryo-treated at −80 °C and −140 °C. And the longer the soaking time is during the cryogenic treatment, the higher the friction coefficient reduction can be achieved. The obvious reduction of mass loss can be obtained at −196 °C with 72 h soaking. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to detect the microstructure and worn surface of specimens. By cryogenic treatment, the plowing in the worn surface was smoothed and shallowed, and the degree of plastic deformation in the subsurface was decreased. There was no obvious phase transformation which can be detected in the microstructure after cryogenic treatment. However, the tendency of refinement in grain size can be detected by XRD which improved the Wear resistance of Ti–6Al–4V alloy.
Sh Kheirandish - One of the best experts on this subject based on the ideXlab platform.
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sliding Wear behavior of a grey cast iron surface remelted by tig
Journal of Materials Science & Technology, 2009Co-Authors: H Mohamadzadeh, H Saghafiany, Sh KheirandishAbstract:The sliding Wear behavior of a grey cast iron surface remelted by tungsten inert gas (TIG) was studied and compared with the unremelted one in the current work. To evaluate the Wear behavior a Pin-on-Disk Wear Test machine was used. Pins which were prepared from the samples with the remelted layers of different thicknesses of 1.2, 1.8, 2.5 and 3 mm were worn on an AISID3 steel counterface having a hardness of 63HRC under the applied loads of 54, 76 and 99 N at a constant sliding velocity of 0.45 m/s. Scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis (EDS) and X-ray diffraction (XRD) techniques were used to characterize worn surface and subsurface and also Wear debris obtained from the Wear Tests under different Test conditions. Results showed that surface remelted grey cast iron have better Wear properties for all applied normal loads in comparison with unremelted ones. Microscopic studies on the worn surfaces and subsurfaces of samples revealed that dominant Wear mechanism for surface remelted samples was mild oxidative, while it was severe for unremelted samples. Increasing remelted layer thickness and then forming grosser microstructure lead to a decline of Wear properties, whereas lower thickness of remelted layer with finer microstructure due to having higher cooling rate through remelting process can withstand better against Wear.