This study investigated the microstructure and mechanical properties of the GH3536 alloy produced via Selective Laser Melting(SLM).In-situ tensile tests were conducted at room temperature on SLM GH3536 alloy specimens with different orientations to analyze the evolution of grain orientation and determine the reasons for the anisotropy of mechanical properties.The result indicated that the grains of SLM GH3536 alloy were columnar crystals growing in the building direction,with a preferential orientation in the<101>direction and a high density of dislocations within the sub-crystalline structure.Quantitative analyses of the alloy's strengthening mechanisms showed that the yield strength anisotropy of the specimens is primarily due to differences in grain boundary strengthening and dislocation strengthening.The Z-direction(building direction)specimen exhibited a larger number of grains rotating from<101>to<114>along the tensile axis,resulting in improved coordinated deformation and higher ductility compared to the H-direction(vertical building direction)specimen.In the H specimen,only slight deformation occured.
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