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<p>Polylactic acid is a biodegradable thermoplastic filament used in the fused deposition modeling (FDM) process for the fabrication of functional components. However, the FDM-printed PLA parts exhibit poor mechanical properties in comparison with traditionally fabricated parts because of insufficient inter-filament bonding and thermal residual stresses. The heat treatment process can relieve the residual stresses and improve the mechanical characteristics of FDM-printed parts. Hence, the effect of heat treatment on surface roughness, impact strength and wear resistance of FDM-printed PLA parts is investigated in this study. Post-heat treatment, the surface roughness (Ra) was reduced by 64.7%, while the wear rate was reduced by 84.7%, and the impact strength was improved by 21%. The improvement in various properties was attributed to heat treatment-induced crystallinity and void reduction in PLA samples.</p>

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Effect of Heat Treatment on Surface Roughness, Impact Strength, and Tribological Behavior of Fused Deposition Modeling-Printed Polylactic Acid

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • A. Captan Prabakaran,
  • T. Sathies,
  • M. Sasi Kumar,
  • K. Rajasekar

摘要

Polylactic acid is a biodegradable thermoplastic filament used in the fused deposition modeling (FDM) process for the fabrication of functional components. However, the FDM-printed PLA parts exhibit poor mechanical properties in comparison with traditionally fabricated parts because of insufficient inter-filament bonding and thermal residual stresses. The heat treatment process can relieve the residual stresses and improve the mechanical characteristics of FDM-printed parts. Hence, the effect of heat treatment on surface roughness, impact strength and wear resistance of FDM-printed PLA parts is investigated in this study. Post-heat treatment, the surface roughness (Ra) was reduced by 64.7%, while the wear rate was reduced by 84.7%, and the impact strength was improved by 21%. The improvement in various properties was attributed to heat treatment-induced crystallinity and void reduction in PLA samples.