Document

Welding Metallurgy and Weldability of Structural Fe-Mn Damping Steels

About this Digital Document

Fe-Mn alloys have been identified as suitable candidates for structural applications that require damping. Damping is the ability of a material to convert mechanical vibrations into other forms of energy (usually heat) which is then dissipated in the material. Fe-Mn alloys do this by the oscillatory movement of the martensite variant boundaries, the austenite/martensite interphase boundaries and the stacking fault boundaries in the austenite and martensite phases.Fabricating the structural parts that these alloys are expected to be used for often requires a lot of welding, and so it is important that these alloys can be welded without much trouble. The welding metallurgy and weldability of three high manganese steels was investigated using Varestraint testing, 3D heat flow modelling, wavelength dispersive spectroscopy in the electron microprobe and energy dispersive spectroscopy in the scanning electron microscope. The high manganese steels studied were found to have very poor resistance to solidification cracking compared to existing weldable commercial alloys. Through heat flow modelling, it was established that the ranking of the alloys in the Varestraint test was directly linked to the size of the crack-susceptible region formed in welds in these alloys. The reason for the different sizes of crack-susceptible region was investigated by looking at the segregation behavior of elements in these alloys and how this behavior affected formation of secondary phases at the end of solidification. In the alloy that was the most resistant to solidification cracking, it was observed that element segregation did not lead to significant secondary phase formation, which was the most likely reason for its resistance to cracking.

Full Title
Welding Metallurgy and Weldability of Structural Fe-Mn Damping Steels
Contributor(s)
Thesis advisor: DuPont, John N.
Publisher
Lehigh University
Date Issued
2022-05-01
Type
Genre
Form
electronic documents
Department name
Materials Science and Engineering
Digital Format
electronic documents
Media type
Creator role
Graduate Student
Annor, . M. (2022). Welding Metallurgy and Weldability of Structural Fe-Mn Damping Steels (1–). https://preserve.lehigh.edu/lehigh-scholarship/graduate-publications-theses-dissertations/theses-dissertations/welding-1
Annor, Michael. 2022. “Welding Metallurgy and Weldability of Structural Fe-Mn Damping Steels”. https://preserve.lehigh.edu/lehigh-scholarship/graduate-publications-theses-dissertations/theses-dissertations/welding-1.
Annor, Michael. Welding Metallurgy and Weldability of Structural Fe-Mn Damping Steels. 1 May 2022, https://preserve.lehigh.edu/lehigh-scholarship/graduate-publications-theses-dissertations/theses-dissertations/welding-1.