| Abstrakt: |
Wire arc additive manufacturing (WAAM) has emerged as a promising novel method for producing complex structures used in industries such as aerospace, energy, and construction. In this research, a thick-wall part was fabricated from Hastelloy C-22 using the pulse current-based WAAM technique. The metallurgical and mechanical characterization of the additively manufactured thick-wall component was investigated in both the build direction (x–z) and travel direction (y–x) planes. Microstructure investigations of both planes revealed equiaxed, columnar, and cellular dendrites on the top, middle, and bottom regions, respectively. The SEM/EDS analysis indicated a reduction in Mo and W segregation in inter-dendritic regions of the thick-wall part compared to dendritic core regions. The EBSD study indicates an average grain size of 231.39 μm along the build direction and 193.19 μm along the travel direction. The fraction of higher-angle grain boundaries is substantially higher than that of lower-angle grain boundaries, resulting in improved mechanical properties. Compared to the build direction, the larger average Vickers microhardness in the travel direction is 296, 287, and 291 HV for the top, middle, and bottom regions, respectively. The top regions exhibited a maximum tensile strength of 727 ± 4.19 MPa in the build direction and 723 ± 6.02 MPa in the travel direction. The tensile fracture morphology reveals various dimple structures, which shows the occurrence of ductile failure. The anisotropy of the mechanical performance can be attributed to microstructural heterogeneity. This study focuses on the relationship between the metallurgical and mechanical characteristics of wire arc additive manufactured nickel-based superalloy material. [ABSTRACT FROM AUTHOR] |
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