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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. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) National Research Foundation (NRF) This work was partially supported by the Medium-Sized centre funding scheme awarded by the National Research Foundation, Prime Minister’s Office, Singapore. We also acknowledge support by the Structural Metal Alloys Program of the Agency for Science, Technology and Research of Singapore (grant number A18B1b0061). Xipeng Tan acknowledges the funding supoort by the Singapore Ministry of Education Academic Research Fund Tier 1 (22-4902-A0001). |
