Abstract
In this study, a kind of Ni-based superalloy specially designed for additive manufacturing (AM) was investigated. Thermo-Calc simulation and differential scanning calorimetry (DSC) analysis were used to determine phases and their transformation temperature. Experimental specimens were prepared by laser metal deposition (LMD) and traditional casting method. Microstructure, phase constitution and mechanical properties of the alloy were characterized by scanning electron microscopy (SEM), transmission scanning electron microscopy (TEM), X-ray diffraction (XRD) and tensile tests. The results show that this alloy contains two basic phases, γ/γ’, in addition to these phases, at least two secondary phases may be present, such as MC carbides and Laves phases. Furthermore, the as-deposited alloy has finer dendrite, its mean primary dendrite arm space (PDAS) is about 30–45 μm, and the average size of γ’ particles is 100–150 nm. However, the dendrite size of the as-cast alloy is much larger and its PDAS is 300–500 μm with secondary and even third dendrite arms. Correspondingly, the alloy displays different tensile behavior with different processing methods, and the as-deposited specimen shows better ultimate tensile stress (1,085.7±51.7 MPa), yield stress (697±19.5 MPa) and elongation (25.8%±2.2%) than that of the as-cast specimen. The differences in mechanical properties of the alloy are due to the different morphology and size of dendrites, γ’, and Laves phase, and the segregation of elements, etc. Such important information would be helpful for alloy application as well as new alloy development.
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This work was financially supported by the National Science and Technology Major Project (Y2019-VII-0011-0151), the National Natural Science Foundation of China (No. 51771190).
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Jing-jing Liang Female, Ph.D., Associate Researcher. Her research interests mainly focus on superalloy composition design and process optimization for additive manufacturing. Dr. Liang has presided more than 10 projects, including the projects supported by the National Science Foundation of China and the Primary Research & Development plan of Liaoning Province. She has published more than 30 research papers in journals and possesses 22 invention patents of China.
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Wu, B., Liang, Jj., Yang, Yh. et al. Phase constitution, microstructure and mechanical properties of a Ni-based superalloy specially designed for additive manufacturing. China Foundry 18, 397–408 (2021). https://doi.org/10.1007/s41230-021-9025-1
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DOI: https://doi.org/10.1007/s41230-021-9025-1