ORCID Profile
0000-0002-0072-9171
Current Organisation
University of South Australia
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Publisher: Elsevier BV
Date: 07-2022
Publisher: Springer Science and Business Media LLC
Date: 29-05-2023
Publisher: Elsevier BV
Date: 2022
Publisher: Elsevier BV
Date: 2022
Publisher: IOP Publishing
Date: 10-2019
DOI: 10.1088/1757-899X/561/1/012063
Abstract: Direct metal laser deposition of hardfacing alloys on engineering components can improve their life significantly. This work explores the role of laser power and scanning speed on the deposition geometry of Ni5Mo5Al. Variation of cross-sectional morphologies of overlapped deposition tracks with varying process parameters was examined. The results indicated that higher laser power or lower laser scanning speed improves the deposition rate. Near-uniform heights of overlapping deposition tracks were achieved for 600 W laser power and 700 mm/min scanning speed with ∼50% overlap. The depth of penetration was also highest for that parameter combination. The resultant coating exhibited an almost 60% rise in microhardness from the base material, signifying the potential of the deposited material in improving the wear and erosion resistance of engineering components.
Publisher: Springer Science and Business Media LLC
Date: 25-03-2023
Publisher: IOP Publishing
Date: 10-2019
DOI: 10.1088/1757-899X/561/1/012059
Abstract: Exhaust fans and manifolds, valve and pump seats, connecting rods etc. are coated with Ni-5Mo-5Al powder for service temperature up to 650 °C. Till date, it has been coated on structural steels etc. substrate mostly using plasma spray and High-Velocity Oxy-Fuel (HVOF) spraying. However, a few pioneering works, reported cladding by melt and deposition of the same powder using laser. Laser being much more precise heat source has the potential to achieve cladding without causing much thermally induced damage. In this work, laser cladding of Ni-5Mo-5Al powder was simulated probably for the first time. Layer thickness and width were input from the experiments. A significant amount of tensile residual stress (up to 500 MPa normal stress component along the scan track) and deformation (up to 32 μm) of the deposited layer was found in the simulation results. These were more at higher laser power. Experiments consisted of depositing overlapping tracks, on AISI 1020 steel cylindrical substrates having 39 mm diameter and 22.4 mm thickness, by blown powder method, with the help of a 2 KW Yb fibre laser having 1.07 μmwavelength.
Publisher: Elsevier BV
Date: 2022
Publisher: Laser Institute of America
Date: 15-07-2022
DOI: 10.2351/7.0000676
Abstract: Open cell aluminum foam having high porosity has the potential to increase the efficiency of a heat exchanger and also to be used for erse other functions. However, being prone to fail easily under tensile mechanical load, their thermal forming using a laser has been proposed in the literature. This work investigates the effect of laser parameters, orientation-position-curvature of scan path, the number of scans, and foam thickness on the bending angle achieved while forming 95% porous pure aluminum (99.7% aluminum) open cell foam plates using a diode laser. Furthermore, the capability of laser forming to produce developable and nondevelopable surfaces out of this foam has been demonstrated. Higher line energy gave a higher bending angle. Under the same line energy, the combination of higher power-higher scan speed produced a higher bending angle. In contradiction to laser forming of the sheet metal, no saturation or reduction in bending angle per scan pass was observed with an increase in scan pass number. This observation could be explained with the help of cell densification by previous scan passes leading to an increase in the coupling of more thermal energy for subsequent scan passes. Scan paths with increased curvature (or less radius) also produced higher bending due to a higher amount of cell collapse in the irradiated region.
Publisher: SAGE Publications
Date: 30-10-2023
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 12-2023
Location: No location found
Location: India
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