Strengthening and hardening mechanisms of additively manufactured stainless steels: The role of cell sizes

By Zan Li, B. He, Qiang Guo. 2020

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Abstract We designed micromechanical experiments to examine the deformation behaviors of austenitic stainless steels fabricated by additive manufacturing. Micro-pillars containing different dislocation cell sizes were produced from the bulk specimen, and were mechanically tested for direct assessment of cell size reliance of yield and plastic deformation processes. The results highlight the cruciality of dislocation density in determining the yield strength of additively manufactured stainless steels, challenging the previous viewpoint that the strength scales with the cell size. However, dislocation nucleation and hardening of these micro-pillars were found to be cell size-correlated, with easier dislocation nucleation for micro-pillars containing smaller cells.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/219afd4e648961381366194b5a8276089180cac8