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_RP27-0033
The Effects of Multiple Scans on Heat Penetration and Surface Roughness During Laser Surface Melting
1SMART Lab, Mechanical Engineering Discipline, IIT Gandhinagar, Gujarat, India.
2Mechanical Engineering Discipline, IIT Gandhinagar, Gujarat, India.
ABSTRACT
Laser surface melting is a thermal process that is used to modify surface topography, and in turn improve its properties. Laser-based processes are accompanied by larger heat-affected zones (HAZs), which deteriorate the properties of components. This work investigates a strategy of the double scan to reduce HAZ. The total energy density during a single scan is shared between two scans, thus reducing the energy accumulation per scan, resulting in lower HAZ penetration from the surface (~24% reduction). However, the surface roughness measured in direction of the scan direction increases if both the scans are run in the same direction (~68nm) when compared to the single scan strategy (~55nm). The introduction of orientation in the direction of second scan resulted in ~73% reduction in surface roughness. Also, the maximum reduction for surface roughness measured in direction perpendicular to the scan direction is achieved as ~33% when the orientation is 900.
Keywords: Surface Roughness, Laser Surface Melting, Heat Affected Zones, Scan Strategy.
1SMART Lab, Mechanical Engineering Discipline, IIT Gandhinagar, Gujarat, India.
2Mechanical Engineering Discipline, IIT Gandhinagar, Gujarat, India.
ABSTRACT
Laser surface melting is a thermal process that is used to modify surface topography, and in turn improve its properties. Laser-based processes are accompanied by larger heat-affected zones (HAZs), which deteriorate the properties of components. This work investigates a strategy of the double scan to reduce HAZ. The total energy density during a single scan is shared between two scans, thus reducing the energy accumulation per scan, resulting in lower HAZ penetration from the surface (~24% reduction). However, the surface roughness measured in direction of the scan direction increases if both the scans are run in the same direction (~68nm) when compared to the single scan strategy (~55nm). The introduction of orientation in the direction of second scan resulted in ~73% reduction in surface roughness. Also, the maximum reduction for surface roughness measured in direction perpendicular to the scan direction is achieved as ~33% when the orientation is 900.
Keywords: Surface Roughness, Laser Surface Melting, Heat Affected Zones, Scan Strategy.
