Nanometer-scale precipitations in a selective electron beam melted nickel-based superalloy
نویسندگان
چکیده
Abstract The nanometer-scale (nano-scale) microstructural evolution in an additively manufactured Re-free Ni-based superalloy, with single crystal compositions, is investigated through field emission scanning electron microscopy, transmission and atom probe tomography. We find that nano-scale primary ?? precipitation occurs the fine as-built microstructure, leading to exceptional microhardness of 480.0 ± 6.7 HV at room temperature. Presence ultra-fine precipitates, ~ 20 nm size, observed bottom few layers samples, which hitherto undocumented contrary widespread consensus regarding hierarchical phase superalloys. Moreover, considerable tantalum-rich C14 Laves grain boundaries interdendritic regions samples emphasizes need for additive manufacturing specific alloy design.
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ژورنال
عنوان ژورنال: Scripta Materialia
سال: 2021
ISSN: ['1359-6462', '1872-8456']
DOI: https://doi.org/10.1016/j.scriptamat.2020.113661