EFFECT OF BUILD DIRECTION ON CRACK GROWTH BEHAVIOR OF Ti6Al4V ALLOY MANUFACTURED BY ELECTRON BEAM MELTING

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2022-12-01

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Çalık, Feyziye

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The effects of build orientation on the crack propagation behavior of Ti6Al4V fabricated by elecron beam melting which is one of metal additive manufacturing methods were examined in this study. Firstly, Ti6Al4V blocks were manufactured at different building angles (00,300,450and 900) regarding as base plane using EBM. Subsequently, test specimens were machined from these blocks in compliance with ASTM E8, ASTM E399 and ASTM E647 standards for tensile, fracture toughness and crack growth rate specimens, respectively. Computed tomography was used to determine the amount of defects prior to fatigue crack growth test. dadN vs. ΔK graphs of these specimens constructed at four different angles were investigated. Scanning electron microscope was used to analyse fracture surfaces. It was noted that parts produced at 00 angle have higher tensile mechanical properties. On the other hand, parts EBM processed with 300 have less elongated structure due to the unmelted regions. Regarding as crack propagation, part EBM processed with 300 has the lowest resistance to fatigue crack propagation.

Subject Keywords

electron beam, crack growth rate, additive manufacturing

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https://hdl.handle.net/11511/101868

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

F. Çalık, “EFFECT OF BUILD DIRECTION ON CRACK GROWTH BEHAVIOR OF Ti6Al4V ALLOY MANUFACTURED BY ELECTRON BEAM MELTING,” M.S. - Master of Science, Middle East Technical University, 2022.