Abstract
This study investigated the fatigue resistance of additively manufactured steel plates with galvanized surfaces. Therefore, the effects of hot-dip galvanization (HDG) on the surface characteristics, mechanical properties, and fatigue resistance of the manufactured samples were investigated. This research involved measurements of the surface roughness and waviness before and after the HDG process to assess the impact of the zinc layer. Statistical analysis revealed no significant difference in the distribution of surface roughness; however, microscopic examination revealed sharper notches owing to the vertical growth of the zinc layer.Quasi-static tension tests demonstrated that HDG has a minimal influence on the yield strength, provided that the load transfer contribution of the soft zinc layer is excluded. Nonetheless, the mean elongation at fracture was slightly reduced in the HDG samples. Remarkably, a significant effect on fatigue resistance was observed with a detail category of 80 and an inverse slope of m = 3. This fatigue resistance aligned closely with that of the as-welded samples under high stress ranges while demonstrating a lower resistance under smaller stress ranges.
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