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Advanced Characterization of Solid-State Dissimilar Material Joints

Lee, Genevieve W
http://orcid.org/0000-0001-9205-234X
http://rave.ohiolink.edu/etdc/view?acc_num=osu1492794418438023

Abstract Details

2017, Master of Science, Ohio State University, Welding Engineering.
Dissimilar materials are commonly used in various industries to create efficient joints that can maintain functionality and cut cost or weight. The energy industry commonly combines cost-effective steel with corrosion resistant alloys in particularly demanding service environments. The transportation industry has increasingly pushed for light-weighting vehicles by means of introducing aluminum-alloys into the steel-dominated industry using dissimilar joints. However, these material combinations come with many weldability issues, including embrittlement, solidification cracking, or intermetallic compounds formation. Solid-state welds have been developed to overcome such issues, but some challenges have persisted. This study examines friction stir welds (FSW) between Ni-base alloy to carbon steel and aluminum alloy to carbon steel as well as an impact vaporized foil actuator weld (VFAW) between aluminum alloy and a dual phase carbon steel. Electron microscope techniques such as transmission Kikuchi diffraction (TKD), a microscopy method akin to electron backscatter diffraction (EBSD), and energy dispersive X-ray spectroscopy (XEDS) are used to characterize weld interfaces. Regions within micrometers of the weld interface are characterized; Al-steel welds are examined for the presence of intermetallic compounds. The matrix and precipitates are identified in the Ni-steel FSW; intermetallic compounds are confirmed in the VFAW weld but not in the Al-steel FSW. Texture analysis is also conducted, and the data correspond with reports of FSW and simple shear textures of similar alloys. Additionally, nanoindentation of join interfaces also corroborates current studies of strengthening mechanisms of the solid-state weld methods.
Antonio Ramirez, PhD (Advisor)
Carolin Fink, PhD (Committee Member)
127 p.
Engineering; Materials Science; Metallurgy
transmission Kikuchi diffraction, solid-state welding, friction stir welding, vaporized foil actuator welding, dissimilar metal welding, nickel-base alloys, aluminum alloys

Recommended Citations

Citations

  • Lee, G. W. (2017). Advanced Characterization of Solid-State Dissimilar Material Joints [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492794418438023

    APA Style (7th edition)

  • Lee, Genevieve. Advanced Characterization of Solid-State Dissimilar Material Joints. 2017. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1492794418438023.

    MLA Style (8th edition)

  • Lee, Genevieve. "Advanced Characterization of Solid-State Dissimilar Material Joints." Master's thesis, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1492794418438023

    Chicago Manual of Style (17th edition)

osu1492794418438023
606
© 2017, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.