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Processing Parameters Influence on Microhardness in Laser Metal Deposited Titanium Alloy using Design if Experiment
摘要： Laser Metal Deposition (LMD) is an additive manufacturing process for producing complex parts directly from the Computer Aided Design (CAD) model of the part and for repair of an existing worn out part. The LMD process is governed by processing parameters: laser power, gas flow rate, powder flow rate and scanning speed that influence the microhardness produced during the LMD process. In this study, statistical design of experiment to was employed to investigate the influence of processing parameters on the microhardness of laser metal deposited of Ti6Al4V powder on Ti6Al4V substrate. Full factorial design was used in this study because of its ability to capture the main effects and possible interaction effects of these processing parameters. Each processing parameters was set at low and high values and a total of sixteen (16) experiments was performed and the microhardness of each sample was measured and analyzed.
关键词： Laser Metal Deposition,Titanium alloy,Processing parameters,Microhardness,Full factorial design
更新于2025-09-12 10:27:22
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Characterization and tribological evaluation of NiCrMoNb and NiCrBSiC laser cladding on near-α titanium alloy
摘要： In the present study, two different types of coatings such as NiCrMoNb and NiCrBSiC were produced on titanium alloy using a high power Yb:YAG disk laser. Then the coatings were analysed to expose their phase characterization, microstructure and hardness using X-ray diffraction analysis (XRD), energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), optical microscopy (OM) and Vickers microhardness machine (HV). Further, tribotest was performed through ball-on-plate machine to analyse the wear properties of coatings. In addition, worn surfaces of cladding and surface roughness were examined using FE-SEM and whitelight interferometer, respectively. The results showed that the both NiCrMoNb and NiCrBSiC cladding exhibited a dendrite homogeneous structure due to higher cooling rates. XRD results indicating that the solid solution of γ-Ni was mixed with chromium, boride, silicon and formed the structure of interdendritic eutectics on cladding region. Microhardness of the clad layer has remarkably been increased than substrate. The results of friction coefficient of specimen with NiCrBSiC are lower than that of specimens NiCrMoNb clad and substrate. Also, the wear resistance of NiCrBSiC clad has been increased than NiCrMoNb clad and substrate sample, which reveals that NiCrBSiC laser cladding plays a major role on wear resistance. The microstructures of NiCrMoNb and NiCrBSiC cladding layer are composed of Ni-rich austenitic, Cr, Mo, Nb and carbide, borides, respectively. The analysed wear track indicates that adhesion and abrasion was a major wear mechanism. The NiCrSiBC cladded worn-out surfaces exhibited reduction in surface roughness than NiCrMoNb clad and substrate.
关键词： NiCrBSiC,Cladding,Microstructure,Titanium alloy,Surface roughness,Wear mechanism,NiCrMoNb
更新于2025-09-12 10:27:22
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Study of heat treatment impact on the surface defects appearance on samples obtained by selective laser melting of Ti-6Al-4V during chemical polishing
摘要： Among advantages of selective laser melting (SLM) there are some problems in titanium alloys surface roughness after the sintering. Present work illustrates results of roughness measurements of Ti-6Al-44V titanium alloy samples after selective laser melting, heat treatment, mechanical brushing and acid polishing. It was found that surface roughness of SLM samples depends on heat treatment and chemical polishing modes; the biggest roughness is noted after the oil quenching from 950 (cid:1)C with subsequent aging at 650 (cid:1)C during 120 min. The best surface quality was obtained after annealing for 2 h at 650 (cid:1)C, water quenching at 950 (cid:1)C, mechanical brushing and chemical polishing.
关键词： Chemical polishing,Titanium alloy,Heat treatment,Selective laser melting,Surface roughness
更新于2025-09-12 10:27:22
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In situ tailoring microstructure in laser solid formed titanium alloy for superior fatigue crack growth resistance
摘要： For damage tolerance (DT) titanium alloy, the fatigue crack growth resistance (FCGR) is a critical properties requirement for engineering applications. However, the Ti-6Al-4V-DT parts fabricated by laser solid forming (LSF) suffer from low FCGR, because of predominant basket-wave microstructure. Here, we have explored a novel LSF fabrication design to produce full colony microstructure, via in-situ controlled growth. The creation of such microstructures leads to superior FCGR, which markedly exceed conventional additive manufactured and mill-annealed samples. The present works provide a significant guidance for LSF-fabricated titanium alloy with high DT properties.
关键词： Titanium alloy,Fatigue crack growth resistance,Laser solid forming,Colony microstructure
更新于2025-09-11 14:15:04
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A Parametric Study of Kerf Deviation in Fiber Laser Micro Cutting on Ti6Al4V Superalloy
摘要： A distinctive scope in the fabrication of desired products with specific standard has been achieved by the recent advancement in the technology. This available developing technology is able to produce production of various components, structures, shapes etc made of different kind of materials with necessary dimensional and geometrical features. But it is extremely difficult for 50 Watt average power machine to achieve good quality cutting of the metal sheet upto 2 mm thickness. A unique parameter sawing angle acts as a significant use in kerf deviation in cutting titanium alloy sheet (Ti6Al4V) of 1 mm thickness in low power fiber laser beam machining. The present field of study deals with the effect of sawing angle with other process parameters like cutting speed, power setting, duty cycle, and pulse frequency for a titanium alloy metal sheet to reduce kerf deviation where experiments are carried out on the basis of central composite design (CCD) technique of RSM.
关键词： Kerf deviation,Sawing angle,Titanium alloy Ti6Al4V,RSM
更新于2025-09-11 14:15:04
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Microstructure and Electrochemical Behavior of TiO <sub/>2</sub> Nanotubes Coated on Titanium-Based Substrate Before and After Thermal Treatment
摘要： The comparative study of the structure and electrochemical properties of TiO2 layers on the surfaces of commercially pure titanium and Ti6Al4V alloy were performed. The TiO2 surface layers produced by anodization in ethylene glycol-based electrolyte solution using Power Supply MCS-3204 MANSON at 20 V or 40 V for 60 minutes were formed on the titanium substrates by simultaneous surface oxidation and controlled dissolving of oxide film due the fluorine ions. The SEM and X-ray diffraction analyses were performed to determine the properties of the anodized layers before and after heat treatment at 500 °C for 120 minutes. The as-anodized TiO2 nanotubes exhibited an amorphous structure. An anatase phase appeared in annealed nanotube layers of both Ti based substrates. The corrosion behavior in simulated physiological solution was compared for not anodized, anodized and anodized heat treated conditions of both titanium surfaces. The results of the electrochemical measurements corresponded to the microstructure and treatment condition. The porous feature of the anodizing layers on Ti6Al4V substrate led to lower corrosion resistance that increased after the heat treatment.
关键词： TiO2 Nanotubes,XRD,Titanium Alloy,Anodization,Microstructure
更新于2025-09-04 15:30:14