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Influence of process variables on surface roughness of 316L stainless steel parts fabricated via selective laser melting process


Affiliations
1 National Institute of Technology Delhi, India
2 CSIR–National Physical Laboratory, New Delhi, India
3 Indian Institute of Technology Kanpur, Kanpur, India
     

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Selective laser melting process (SLM) is a metal additive manufacturing technique with excellent design freedom and feasibility. In SLM, a high-energy source is used to melt powder particles into a pattern of successive layers. However, the major challenge associated with the SLM process is that the parts have a high surface roughness (Ra) compared to forming, machining, and rolling processes. In this paper, the core parameters, including scan speed, hatch distance, laser power, and energy density effects discussed as the roughness parameters. The experimental runs were designed based on Taguchi L9 orthogonal array. The results displayed that Ra of samples was largely affected by laser power as compared to scanning speed and hatching spacing. The Ra of samples achieved less at high energy density. In contrast to other surface finishing operations, the polished sample showed the average Ra value of 0.049 μm manufactured at an energy density of 58.83 J/mm3.

Keywords

Selective Laser Melting, Process Parameter, Energy Density, 316L SS, Surface Roughness.
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  • Influence of process variables on surface roughness of 316L stainless steel parts fabricated via selective laser melting process

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Authors

Meena Pant
National Institute of Technology Delhi, India
Leeladhar Nagdeve
National Institute of Technology Delhi, India
Girija Moona
CSIR–National Physical Laboratory, New Delhi, India
Harish Kumar
National Institute of Technology Delhi, India
J. Ramkumar
Indian Institute of Technology Kanpur, Kanpur, India

Abstract


Selective laser melting process (SLM) is a metal additive manufacturing technique with excellent design freedom and feasibility. In SLM, a high-energy source is used to melt powder particles into a pattern of successive layers. However, the major challenge associated with the SLM process is that the parts have a high surface roughness (Ra) compared to forming, machining, and rolling processes. In this paper, the core parameters, including scan speed, hatch distance, laser power, and energy density effects discussed as the roughness parameters. The experimental runs were designed based on Taguchi L9 orthogonal array. The results displayed that Ra of samples was largely affected by laser power as compared to scanning speed and hatching spacing. The Ra of samples achieved less at high energy density. In contrast to other surface finishing operations, the polished sample showed the average Ra value of 0.049 μm manufactured at an energy density of 58.83 J/mm3.

Keywords


Selective Laser Melting, Process Parameter, Energy Density, 316L SS, Surface Roughness.

References