Thesis
Microstructure evolution during friction stir welding of magnesium to steels
Washington State University
Master of Science (MS), Washington State University
2011
Handle:
https://hdl.handle.net/2376/102964
Abstract
The thesis figured out a way of joining Magnesium alloy AZ31 sheet to galvanized steels by friction stir welding (FSW). Two sheet steels were used to study the texture evolution of the dissimilar joining; a 0.8mm thick, electro galvanized (EG) mild steel, and a 1.5mm thick hot dipped galvanized (HDG) high-strength, low-alloy steel (HSLA). These steels were joined to 2.33mm thick AZ31B magnesium sheet. The research shows four different regions formed during the welding, e.g. thermo-mechanic affected zone (TMAZ), the weld nugget, flow arm and interface. Textures in different regions were influenced by the heat and strain. Electron back-scatter diffraction (EBSD) method was used to study the microstructure evolution. Results indicate that the weld nugget texture was generated by dynamic recrystallization and the grain orientations were determined by the simple shear from the tool. Two distinct hooks were formed in the welding and affected the textures nearby. No permeation of magnesium and steels was observed and the sheets were connected by mechanical bond.
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Details
- Title
- Microstructure evolution during friction stir welding of magnesium to steels
- Creators
- Hao Yu
- Contributors
- David P. Field (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525388601842
- Language
- English
- Resource Type
- Thesis