Browsing by Subject "superalloys"

Now showing 1 - 5 of 5
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    Effect of Heat Treatment on the Microstructures of CMSX-4® Processed Through Scanning Laser Epitaxy (SLE)
    (University of Texas at Austin, 2017) Basak, Amrita; Das, Suman
    Engineered components made of superalloys routinely undergo heat treatment procedures to tailor their microstructures and properties. In this study, the effect of heat treatment on the microstructures and microhardness of single-crystal nickel-base superalloy CMSX-4® is investigated. Samples of CMSX-4® are fabricated using scanning laser epitaxy (SLE), a laser powder bed fusion (LPBF)-based additive manufacturing process. Microstructural characterizations of the as-deposited and the heat treated CMSX-4® samples are performed using optical microscopy, scanning electron microscopy, x-ray diffraction, and Vickers microhardness measurements. The results show that the microstructure is homogenized with reductions in the eutectic volume fraction after heat treatment. The microhardness values are also improved upon heat treatment.
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    Effects of Processing Parameters on the Mechanical Properties of CMSX-4® Additively Fabricated through Scanning Laser Epitaxy (SLE)
    (University of Texas at Austin, 2017) Basak, Amrita; Kalaitzidou, Kyriaki; Das, Suman
    The work aims to characterize the effects of processing parameters on the mechanical properties of CMSX-4® fabricated using a laser-powder bed fusion (LPBF)-based additive manufacturing (AM) process, scanning laser epitaxy (SLE). The laser power, the scan speed, and the number of repeat scans are varied in SLE. These parameters are combined to define a new measure such as the energy density. Microstructures of the samples are investigated using optical microscopy and scanning electron microscopy. Uniaxial tension tests are performed on samples in longitudinal direction and relevant data is extracted.
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    EXPLORING IN718 ALLOY PRODUCTION WITH BI-DIRECTIONAL RASTER AND STOCHASTIC SPOT MELTING TECHNIQUES USING AN OPEN-SOURCE ELECTRON MELTING SYSTEM
    (University of Texas at Austin, 2023) Nabil, S.T.; Banuelos, C.; Ramirez, B.; Cruz, A.; Watanabe, K.I.; Arrieta, E.; Wicker, R.B.; Medina, F.
    This study compares the fabrication of IN718 alloy using bi-directional raster and stochastic spot melting techniques with the open-source FreemeltOne Electron Beam Melting (EBM) system. The research aimed to produce dense parts using both scanning strategies, employing custom Python code for raster melt beam path generation and PixelMelt software for stochastic spot melting path generation. After optimizing process parameters, 10mm height builds for each scanning strategy were fabricated, and their microstructure, hardness, and density were analyzed using optical microscopy and SEM, Vickers microhardness scale, and a pycnometer. The findings reveal valuable insights into the effects of scanning strategies on the microstructure, hardness, and density of IN718 alloy components, advancing additive manufacturing knowledge.
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    Fatigue Behavior and Failure Mechanisms of Direct Laser Deposited Inconel 718
    (University of Texas at Austin, 2016) Johnson, Alexander S.; Shuai, Shao; Shamsaei, Nima; Thompson, Scott M.; Bian, Linkan
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    An Investigation of the Dendritic Segregation in Single-Crystal René N5 Fabricated Through Scanning Laser Epitaxy
    (University of Texas at Austin, 2016) Basak, Amrita; Das, Suman
    Dendritic segregation in single-crystal nickel-base superalloy René N5 was investigated in the present study.