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Prokop Final 8 9 24 with cert.pdf (5.39 MB)

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Influence of Hybrid Additive Manufacturing Parameters on the Mechanical Properties of Invar 36

Prokop, Andrew
http://rave.ohiolink.edu/etdc/view?acc_num=ysu1723483557436228

Abstract Details

2024, Master of Science in Engineering, Youngstown State University, Department of Mechanical, Industrial and Manufacturing Engineering.
Hybrid Additive Manufacturing (Hybrid AM) is a method of additively building and machining a three-dimensional part through layering of material and periodically machining to net-shape or finished shape. This research is designed to explore the relationship of the printing parameters of Invar 36 and its mechanical behavior through mechanical testing, microstructure and chemical composition characterization. The additive builds were made using the same process parameters and built in two orientations (XY and Z) and three directions (0°, 45°, and 90°). The printing directions had the largest effect on the mechanical properties when the directions caused a longer print time or a greater thermal load on the parts. The parts built in the XY BRP45 orientation and direction show an average ultimate tensile strength of 384.3 MPa and Rockwell Hardness B averages of 39.4. Based on the chemical analysis and the light and electron microscopy investigations several factors affecting the mechanical behavior of as-printed parts are grain size, manufacturing defects (voids and cracks), inclusions, and chemical segregations. Following the Hall-Petch equation there is a direct correlation between the material yield strength and grain size. In the printed parts the grain size and orientation are controlled by different cooling conditions. Conduction cooling at the interface between print and build plate creates the condition of textured structure. In this case the elongated grains are formed, with the longitudinal axes perpendicular to the build plate (XY bottom samples). In the case of Z oriented samples variation in convection cooling conditions creates different microstructure between the front and back samples. Ti-inclusions seems to be due to the printing environment, since no Ti is listed in the nominal chemical composition of the Invar 36 starting wire.
Constantin Solomon, PhD (Advisor)
Brian Vuksanovich, PhD (Committee Member)
Pedro Cortes, PhD (Committee Member)
72 p.
Engineering; Mechanical Engineering
Invar 36; Additive Manufacturing; Hybrid Additive Manufacturing; Mechanical Properties

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Citations

  • Prokop, A. (2024). Influence of Hybrid Additive Manufacturing Parameters on the Mechanical Properties of Invar 36 [Master's thesis, Youngstown State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1723483557436228

    APA Style (7th edition)

  • Prokop, Andrew. Influence of Hybrid Additive Manufacturing Parameters on the Mechanical Properties of Invar 36. 2024. Youngstown State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ysu1723483557436228.

    MLA Style (8th edition)

  • Prokop, Andrew. "Influence of Hybrid Additive Manufacturing Parameters on the Mechanical Properties of Invar 36." Master's thesis, Youngstown State University, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1723483557436228

    Chicago Manual of Style (17th edition)

ysu1723483557436228
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© 2024, all rights reserved.
This open access ETD is published by Youngstown State University and OhioLINK.