The Experts below are selected from a list of 39324 Experts worldwide ranked by ideXlab platform
Weidong Liu - One of the best experts on this subject based on the ideXlab platform.
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electrolyte jet machining of ti1023 Titanium Alloy using nacl ethylene glycol based electrolyte
Journal of Materials Processing Technology, 2020Co-Authors: Weidong Liu, Zhen Luo, Masanori KuniedaAbstract:Abstract Titanium Alloy is increasingly used in industries due to its outstanding properties but machining of such difficult-to-cut metal faces lots of challenges. As an advanced electrochemical machining (ECM) method, electrolyte jet machining (EJM) is a potential alternative for machining of Titanium Alloy. However, oxide layer usually forms in traditional water-based electrolyte, which prevents uniform dissolution and consequently deteriorates the machining accuracy. To overcome the oxide layer, a novel electrolyte with organic solvent, NaCl ethylene glycol (EG)-based solution, was introduced in EJM of a typical Titanium Alloy (Ti1023) in this work. The current efficiency curves in NaCl water-based and EG-based electrolytes were experimentally measured, which show opposite behavior. Besides, machining experiments were conducted using different electrolytes. The results show that NaCl EG-based electrolyte helps to avoid formation of oxide layer throughout the EJM process, leading to better comprehensive performance than water-based electrolyte, especially in superimposed translating EJM. In addition, parametric effects on machining performance using NaCl EG-based electrolyte were investigated as the hint for selecting optimum machining conditions. Furthermore, high electrolyte temperature was proposed in this work to enable usage of small nozzle in EJM with EG-based electrolyte for miniaturization of machined geometry.
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jet electrochemical machining of tb6 Titanium Alloy
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Weidong Liu, Zuming Liu, Zhengming Wang, Zhen Luo, Zhiping Wang, Renfeng SongAbstract:TB6 Titanium Alloy (Ti-10V-2Fe-3Al) is a prospective material to replace the traditional Titanium Alloys in aviation industry due to its excellent comprehensive properties. However, machining of TB6 Titanium Alloy with traditional processes is characterized by the low machining efficiency, high tool wear, reduced machining accuracy, and inferior surface finish. Electrochemical machining (ECM) is a potential processing technology for Titanium Alloy, but almost no investigation has been performed on TB6. This paper aims to study the feasibility and select the optimum process parameters for Jet-ECM machining of TB6 Titanium Alloy. The dissolution behavior of TB6 Titanium Alloy in sodium nitrate and sodium chloride electrolyte with different concentration and temperature is analyzed. Then, the effect of main parameters, including the composition and concentration of electrolyte, machining voltage, electrolyte flow rate, and inter-electrode gap (IEG), on machining performance is investigated in detail. From experiments, 24 V voltage, 0.6 mm IEG, 2.1 L/min flow rate, and 15 % sodium chloride electrolyte are selected as optimum parameters. The experimental results by using the chosen parameters reveal that the comprehensive machining performance, including material removal rate (10.062 g/min), surface toughness (0.231 μm), taper (2.5), and average overcut (1.01 mm), is acceptable from the viewpoint of industry.
S. H. Tomadi - One of the best experts on this subject based on the ideXlab platform.
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Failure mode analysis of carbide cutting tools used for machining Titanium Alloy
Ceramics International, 2013Co-Authors: Jaharah A Ghani, Che Hassan Che Haron, S. H. Hamdan, A. Y. M. Said, S. H. TomadiAbstract:Abstract Intensive research on the performance of coated carbide tools in machining Titanium Alloy is being conducted worldwide. Titanium Alloy has special characteristics such as high strength at elevated temperature and high mechanical resistance that makes carbide tools suitable to cut this material. This is because carbide tools are classified as hard and highly resistant to wear even at high temperature. This paper discusses the failure mode of a coated carbide cutting edge that is caused by the loading and unloading effect during milling. Tool failure adversely affects tool life, the quality of the machined surface and the surface's dimensional accuracy, and consequently the economics of cutting operations. The milling parameters that were observed to affect the failure of coated carbide tools were cutting speed, feed rate, depth of cut, and the application of a cutting fluid. Wear occurred along the flank and rake faces, which then propagated into the substrate material after the removal of the coating material. Wear along the flank and rake faces led to the concentration of stress over a certain area of the cutting edge, which was initiated by a microcrack and then propagated due to the loading and unloading effect during the intermittent milling process until significant brittle fracture occurred in the substrate material. Cutting speed and depth of cut were identified as the main factors responsible for the failure and fatigue of the coated carbide tools during the milling of Titanium Alloy.
Yong Liu - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of powder metallurgy high temperature Titanium Alloy with high si content
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2020Co-Authors: Rui Guo, Bin Liu, Yuankui Cao, Jingwen Qiu, Feng Chen, Zhiqiao Yan, Yong LiuAbstract:Abstract The service temperature of high temperature Titanium Alloy has been raised from 400 °C to 650 °C in the last years. In this study, a new near α high temperature Titanium Alloy with high Si content (Ti–6Al–4Zr-0.5Mo-0.6Si, wt. %) which can serve at 700 °C was developed by powder metallurgy (P/M) method. The microstructure and mechanical properties were investigated. The results show that the P/M Titanium Alloy exhibits an α + β two-phase microstructure with dispersed fine S2 type silicide ((TiZr)6Si3). The yield strength and ultimate tensile strength are 1023 MPa and 1190 MPa at room temperature, with an elongation of 10%. At 700 °C, the Alloy still maintains a yield strength, an ultimate strength, and an elongation of 510 MPa, 651 MPa and 13%, respectively. The high strength is mainly attributed to the precipitation strengthening of the silicide and the formation of fine-grained α′ phase.
Shiqin Yang - One of the best experts on this subject based on the ideXlab platform.
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Vacuum hot roll bonding of Titanium Alloy and stainless steel using nickel interlayer
Materials Science and Technology, 2009Co-Authors: Jiuchun Yan, D. S. Zhao, C. W. Wang, Y. Wang, Liuding Wang, Shiqin YangAbstract:Abstract Vacuum hot roll bonding of Titanium Alloy and stainless steel using a nickel interlayer was investigated. No obvious reaction or diffusion layer occurs at the interface between stainless steel and nickel. The interface between Titanium Alloy and nickel consists of an occludent layer and diffusion layers, and there are the intermetallic compounds (TiNi3, TiNi, Ti2Ni and their mixtures) in the layers. The total thickness of intermetallic layers at the interface between Titanium Alloy and nickel increases with the bonding temperature, and the tensile strength of roll bonded joints decreases with the bonding temperature. The maximum tensile strength of 440·1 MPa was obtained at the bonding temperature of 760°C, the reduction of 20% and the rolling speed of 38 mm s–1.
Haiyang Zhou - One of the best experts on this subject based on the ideXlab platform.
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formability of ti 6al 4v Titanium Alloy sheet in magnetic pulse bulging
Materials & Design, 2013Co-Authors: Liang Huang, Haiyang ZhouAbstract:Abstract In order to investigate the formability of Ti–6Al–4V Titanium Alloy sheet in high speed forming process, electromagnetic forming (EMF) namely magnetic pulse forming with an Al driver sheet is performed experimentally. Formability under EMF is compared with that in quasi static condition. Fracture analysis for the Titanium Alloy Ti–6Al–4V is then carried out to study the fracture mechanism and material response. Results indicate that the formability undergoing EMF process with a driver sheet is increased beyond that exhibited in quasi-static tests. In electromagnetic free bulging, the forming limit of Ti–6Al–4V increases by 24.37%, which is more optimistic than AA5052-O. Fractography analysis using SEM determines that the Ti–6Al–4V Titanium Alloy sheet fails in a combination of ductile fracture and shear fracture when subjected to the electromagnetic bulging process while only ductile fracture develops in quasi-static condition.
