Abstract
Microstructure and mechanical properties of additively manufactured TC4 alloys were investigated, following boronizing treatment. The treatment process was carried out at temperatures ranging from 950 to 1050 °C and held for 8–15 h. The microstructural features of fabricated boride layers were examined by optical microscopy. The phase compositions of the boride layers were analyzed by X-ray diffraction. The hardness profile through the boride layers was also determined. The results showed that the boride layer of additively manufactured TC4 had a thickness of 51 μm and was composed of an outer TiB2 layer on the top of TiB layer; TiB whiskers wedged into the matrix, forming a strong bond between the boride layer and substrate. The diffusion activation energy was determined to be 80.9 kJ/mol. The matrix was found to transfer from needlelike α′ martensite phase to α + β biphasic compounds. The newly formed boride layer can reach 1680 HV in hardness, thus imparting a strong protection to 3D-printed part.
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