Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting
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Date
2019-03-20
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Mark
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MDPI
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Abstract
The aim of this study is to observe the effect of process parameters on residual stresses
and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated
parameters were hatch laser power, hatch laser velocity, border laser velocity, high-temperature
preheating and time delay. Residual stresses were evaluated by the bridge curvature method and
relative density by the optical method. The effect of the observed process parameters was estimated
by the design of experiment and surface response methods. It was found that for an effective
residual stress reduction, the high preheating temperature was the most significant parameter. High
preheating temperature also increased the relative density but caused changes in the chemical
composition of Ti6Al4V unmelted powder. Chemical analysis proved that after one build job with
high preheating temperature, oxygen and hydrogen content exceeded the ASTM B348 limits for
Grade 5 titanium.
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Peer-reviewed
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en