Part geometry-driven crystallographic texture control in a 3D-printed austenitic steel - a strategy for near-monocrystalline microstructure generation

S Chandra and XP Tan and P Kumar and U Ramamurty, SCRIPTA MATERIALIA, 226, 115255 (2023).

DOI: 10.1016/j.scriptamat.2022.115255

We propose and employ a novel X-shaped geometry to strengthen the 001 || z crystallographic texture - distinctive of the electron beam powder-bed fusion technique, for a 3D-printed austenitic stainless steel of type 316 L. The prism angles of the X-shaped parts are varied among 60, 90, and 120 degrees (X-60, X-90, and X-120) to investigate the effect it has on the parts' properties. Strikingly, the strength of the 001 || z crystallographic texture and columnar grain width with increasing prism angle is seen to follow a 'bell-curve' profile which peaks with the X-90 shape. A distinct mechanical response of X-shaped samples is obtained with X-60 samples showing significantly stronger strain-hardening behavior along with cracking concentrated along the grain boundaries between 110 || z and 001 || z grains. Molecular dynamics simulations are utilized to rationalize this phenomenon.

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