[T7] AM Sinter Based Technologies

[16A-T7-25] Effect of B Addition on Density and Properties in 316L Stainless Steel Manufactured by Filament-Based Extrusion Additive Manufacturing

*C. Suwanpreecha¹, A. Sakkaeo¹, N. Parsompech¹, S. Songkuea¹, A. Manonukul¹ (1.National Sciences and Technology Development Agency (NSTDA), Thailand)

キーワード：Material extrusion additive manufacturing, Austenitic stainless steel, Boron, Density

Filament-based material extrusion additive manufacturing (FB-MEX) has gained much attention due to its simplicity, safety, and cost-effectiveness in fabricating metal parts. However, FB-MEX parts still suffer from two common key defects: (i) porosity generated by pressureless sintering and (ii) voids between printing paths formed during the printing process. These defects result in reducing relative sintered density, thereby adversely deteriorating mechanical properties. In conventional powder metallurgy (PM), the addition of sintering aids such as boron (B), in appropriate amounts to 316L stainless steel has been shown to successfully improve the relative sintered density by modifying the porosity shape and reducing the porosity fraction through the formation of a liquid phase during sintering. Therefore, this study aims to study the effect of B addition on the relative sintered density, microstructure and mechanical properties.