Microstructure and Compression Properties of Fe-Cr-B Alloy Manufactured using Laser Metal Deposition

DEPOSITIONFe-Cr-B alloy is a material with precipitation of boride inside Fe matrix, and it features outstanding hardness and wear resistance properties.However, Fe-Cr-B alloy is a difficult material to process, making it difficult to use as a bulk type structure material which requires delicate shapes.This study attempted to manufacture Fe-Cr-B alloy using a 3D printing process, laser metal deposition.This study also investigated the microstructure, hardness and compression properties of the manufactured alloy.Phase analysis results is confirmed that α-Fe phase as matrix and (Cr, Fe) 2 B phase as reinforcement phase.In the case of (Cr, Fe) 2 B phase, differences were observed according to the sample location.While long, coarse, unidirectional needle-type boride phases (~11 μm thickness) were observed in the center area of the sample, relatively finer boride phases (~6 μm thickness) in random directions were observed in other areas.At room temperature compression test results confirmed that the sample had a compression strength is approximately 2.1 GPa, proving that the sample is a material with extremely high strength.Observation of the compression fracture surface identified intergranular fractures in areas with needle-type boride, and transgranular fractures in areas with random borides.Based on this results, this study also reviewed the deformation behavior of LMD Fe-Cr-B alloy in relation to its microstructures.