Proceedings of the
World Congress on Micro and Nano Manufacturing (WCMNM 2022 )
19–22 September 2022, Lueven, Belgium
doi:10.3850/978-981-18-5180-3_RP10-0051
A Study on Laser Melting of EBM Ti6Al4V Surfaces in Different Environments
1SMART Lab, Mechanical Engineering Discipline, Indian Institute of Technology Gandhinagar, India
2Advanced Materials Processing Research Group, Indian Institute of Technology Gandhinagar, India
ABSTRACT
Interaction of laser with metals and the formation of melt pools is highly dependent on the environment in which they are processed. It can impact the propagation of laser beam, the energy transfer to and from the melt pool in turn the size of the melt pool, and the induced chemical changes of the material. This paper presents an experimental study of laser melting on electron beam melted Ti6Al4V under ambient air, argon gas, deionized water, and cutting fluid solution as processing environments. The melt pool geometries produced by laser scans with laser powers and scan speeds are compared for the four environments. It was observed that laser absorption is high in ambient air due to oxidation and thus forming large pools. The argon environment eliminates the oxidation and creates smaller pools. The cutting fluid absorbed significant incident laser energy and reduced the thermal effect on the surface and thus further reducing the pool size.
Keywords: Electron Beam Melting, Underwater, Under Coolant, Laser Melting, Ti6Al4V, Heat-Affected Zone (HAZ).
1SMART Lab, Mechanical Engineering Discipline, Indian Institute of Technology Gandhinagar, India
2Advanced Materials Processing Research Group, Indian Institute of Technology Gandhinagar, India
ABSTRACT
Interaction of laser with metals and the formation of melt pools is highly dependent on the environment in which they are processed. It can impact the propagation of laser beam, the energy transfer to and from the melt pool in turn the size of the melt pool, and the induced chemical changes of the material. This paper presents an experimental study of laser melting on electron beam melted Ti6Al4V under ambient air, argon gas, deionized water, and cutting fluid solution as processing environments. The melt pool geometries produced by laser scans with laser powers and scan speeds are compared for the four environments. It was observed that laser absorption is high in ambient air due to oxidation and thus forming large pools. The argon environment eliminates the oxidation and creates smaller pools. The cutting fluid absorbed significant incident laser energy and reduced the thermal effect on the surface and thus further reducing the pool size.
Keywords: Electron Beam Melting, Underwater, Under Coolant, Laser Melting, Ti6Al4V, Heat-Affected Zone (HAZ).
