Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting

Martin Malý, Christian Höller, Mateusz Skalon, Benjamin Meier, Daniel Koutný , Rudolf Pichler, Christoph Sommitsch, David Paloušek

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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.
Originalspracheenglisch
Aufsatznummer930
Seitenumfang13
FachzeitschriftMaterials
Jahrgang12
Ausgabenummer6
DOIs
PublikationsstatusVeröffentlicht - 20 Mär 2019

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Preheating
Residual stresses
Melting
Hatches
Lasers
Temperature
Titanium
Chemical analysis
Powders
Design of experiments
Hydrogen
Time delay
Oxygen
titanium alloy (TiAl6V4)

Schlagwörter

    ASJC Scopus subject areas

    • !!Materials Science(all)

    Fields of Expertise

    • Advanced Materials Science

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    Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting. / Malý, Martin; Höller, Christian; Skalon, Mateusz; Meier, Benjamin; Koutný , Daniel ; Pichler, Rudolf; Sommitsch, Christoph; Paloušek, David.

    in: Materials, Jahrgang 12, Nr. 6, 930, 20.03.2019.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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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 andrelative 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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    AU - Malý, Martin

    AU - Höller, Christian

    AU - Skalon, Mateusz

    AU - Meier, Benjamin

    AU - Koutný , Daniel

    AU - Pichler, Rudolf

    AU - Sommitsch, Christoph

    AU - Paloušek, David

    PY - 2019/3/20

    Y1 - 2019/3/20

    N2 - 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 andrelative 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.

    AB - 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 andrelative 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.

    KW - Selective Laser Melting

    KW - Ti6Al4V

    KW - residual stress

    KW - deformation

    KW - preheating

    KW - relative density

    KW - powder degradation

    KW - Deformation

    KW - Powder degradation

    KW - Relative density

    KW - Selective laser melting

    KW - Preheating

    KW - Residual stress

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