Abstract
This work investigates the impact of vacuum sintering and the microstructure-mechanical properties relationship in binder jet additive manufacturing of 316 L. These two perspectives provide valuable understanding to an otherwise well-established area. The resulting properties are compared with those of conventionally manufactured parts. Results revealed isotropic microstructural and mechanical properties in binder jet-manufactured samples. Despite 1.9 ± 0.1% remained porosity, the ductility (elongation to fracture 73 ± 2.8%) of the binder jet specimens was remarkably higher than the conventionally manufactured 316 L alloy due to two-stage work hardening, remaining δ-ferrite, and deformation twinning. The yield strength, ultimate tensile strength, and hardness of the binder jet samples were inferior to those of conventionally manufactured parts, likely due to porosity and grain growth upon sintering.
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