This analysis reveals fracture toughness in various hardmetal grades, suggesting processing impacts mechanical properties.
The demand for hardmetal tools is increasing, often requiring complex geometries to meet extreme specifications. Traditional fabrication methods are limited, prompting the exploration of alternatives, with Additive Manufacturing (AM) emerging as a promising solution.However, changes in processing routes can affect the mechanical integrity of AM hardmetals.AM samples typically show characteristics linked to the layer-by-layer fabrication process, which can cause variations in mechanical properties based on printing direction. Moreover, different hardmetal grades can influence microstructural assemblage behavior during AM.This study evaluates the fracture behavior – strength and toughness - of microstructurally different 3D-printed WC-Co grades produced via binder jetting. They were assessed using 3-point bending tests in unnotched and micronotched (via laser ablation) specimens. Weibull parameters and fracture toughness values were determined and compared under various conditions. Mechanical study was complemented by extensive and detailed fractographic inspection by means of scanning electron microscopy.
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Llanes et al. (2025) studied this question.