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Effect of Build Geometry and Build Parameters on Microstructure, Fatigue Life, and Tensile Properties of Additively Manufactured Alloy 718

Dunn, Anna
http://rave.ohiolink.edu/etdc/view?acc_num=wright1661548523389679

Abstract Details

2022, Master of Science in Materials Science and Engineering (MSMSE), Wright State University, Materials Science and Engineering.
Additive Manufacturing (AM), particularly laser powder bed fusion, is being studied for use in critical component applications. Tensile and fatigue testing shows differences when built using different laser powers. However, when fabricated in an as-printed geometry, the gauge sections of the two specimens are different and experience different thermal behavior. This work explores microhardness, microstructure size, Niobium segregation, and porosity from samples made with varying laser power and different build geometry sizes representative of the gauge sections in the tensile and fatigue bars. Results show that microhardness varies spatially across the sample. Smaller diameter metallographic coupons (fatigue diameter) have a coarser microstructure and lower microhardness than the larger diameter (tensile diameter) when built using the same parameters. Therefore, the fatigue and tensile properties are not comparing the same material structure. Understanding the effect of build geometry on microstructure provides insight towards consistency in AM mechanical properties testing strategies.
Henry D. Young, Ph.D. (Committee Co-Chair)
Joy Gockel, Ph.D. (Committee Co-Chair)
Onome Scott-Emuakpor, Ph.D. (Committee Member)
120 p.
Engineering; Materials Science
Additive Manufacturing; Alloy 718; Microstructural Characterization; Fatigue Testing; tensile Testing; Porosity; Microhardness Testing

Recommended Citations

Citations

  • Dunn, A. (2022). Effect of Build Geometry and Build Parameters on Microstructure, Fatigue Life, and Tensile Properties of Additively Manufactured Alloy 718 [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1661548523389679

    APA Style (7th edition)

  • Dunn, Anna. Effect of Build Geometry and Build Parameters on Microstructure, Fatigue Life, and Tensile Properties of Additively Manufactured Alloy 718. 2022. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1661548523389679.

    MLA Style (8th edition)

  • Dunn, Anna. "Effect of Build Geometry and Build Parameters on Microstructure, Fatigue Life, and Tensile Properties of Additively Manufactured Alloy 718." Master's thesis, Wright State University, 2022. http://rave.ohiolink.edu/etdc/view?acc_num=wright1661548523389679

    Chicago Manual of Style (17th edition)

wright1661548523389679
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© 2022, some rights reserved.Creative Commons License Effect of Build Geometry and Build Parameters on Microstructure, Fatigue Life, and Tensile Properties of Additively Manufactured Alloy 718 by Anna Dunn is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Wright State University and OhioLINK.