High-strength Fe32Cr33Ni29Al3Ti3 fabricated by selective laser melting

Effects of Heat Treatment on the Microstructure and Mechanical Properties of a Dual-Phase High-Entropy Alloy Fabricated via Laser Beam Power Bed Fusion

“…In this study, we selected an as-printed dual-phase Fe32Cr33Ni29Al3Ti3 HEA as a representative specimen to investigate the impact of various heat-treated temperatures on its mechanical properties. The as-printed dual-phase Fe32Cr33Ni29Al3Ti3 HEA fabricated in our preliminary work had a high yield strength exceeding 880 MPa, but a low elongation of less than 6% [16]. Thus, post-heat treatment is necessary for as-printed samples to widen their applications.…”

“…Four cube samples and two dog-bone-shaped samples were fabricated on a 304 stainless steel substrate in the same batch. Detailed information on the powder and LB-PBF strategy can be found in the previous research [16]. All the as-printed samples were cut to a thickness of 2 mm using wire EDM.…”

“…The phase and microstructures on the X-Y plane of both as-printed and heat-treated samples were assessed through XRD (X-ray diffraction), SEM (scanning electron microscope), and EBSD (electron backscatter diffraction) techniques (detailed information of the test equipment and the test details can be found in the previous research [16]). The X-Y plane was chosen for characterization according to the research of Fu et al [10] in which they characterized the X-Y plane of the as-printed and annealed CoCrFeMnNi HEA samples.…”

“…The lattice frictional strength of the present alloy, denoted as σ 0 , can be regarded as 267 MPa, according to (CoCrNi)94Al3Ti3 HEA reported by Zhao et al [27] which has almost the same elemental composition as Fe32Cr33Ni29Al3Ti3 (Fe was replaced by Co. Fe and Co are both iron-based elements, sharing similar physicochemical properties). The ∆σ gb can be calculated by the optimized Hall-Petch equation according to our previous research [16]:…”