Dissertation
MICROSTRUCTURE EVOLUTION OF FCC METALS DURING THE EXPLOSIVE WELDING PROCESS
Doctor of Philosophy (PhD), Washington State University
01/2015
Handle:
https://hdl.handle.net/2376/117480
Abstract
The microstructural features that occur in an explosively welded plate influence the properties of the plate. A proper understanding of the relationships that connect deformation, microstructural evolution and resulting interface structure is required to extend service lifetime of components, reduce the manufacturing costs, and improve product quality. This requires efforts in performing accurate analysis of the undeformed and welded microstructure and identifying the microstructural response to the process. Current models are based on observed phenomenology of the process and therefore fail to predict microstructural response of a material beyond a given set of known parameters. The current research is aimed towards making contribution in the areas of (i) microstructural characterization, (ii) understanding the influence of various microstructural parameters on the evolution of the interface morphology and (iii) on relating the physically measurable mechanical properties.
In an effort to better understand the nature of the relationship between the explosive detonation properties and the weld interface evolution, characterization of the material’s local orientation gradient in the welded specimens was examined by the collection of electron back-scatter patterns. Along with characterization of the ammonium-nitrate fuel-oil explosive, optical microscopy measurements of the characteristic wave, Vickers hardness and shear strength of the weld were investigated.
Microstructural evolution of explosively welded aluminum alloy (AA) 6061 T651 - AA 4047 and C10100 / C11000 copper – stainless steel 304L was investigated using SEM and optical microscopy techniques. The SEM based local orientation measurements at the interface revealed five regions of interest which were all characterized by having a predisposition for a copper type rolling texture. The texture displayed higher intensities of orientations near {112}<111> and {110}<112>. The mechanical testing, in conjunction with orientation maps revealed fine grain regions that were partially annealed due to the heat generated by the collision and subsequent jet formation.
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Details
- Title
- MICROSTRUCTURE EVOLUTION OF FCC METALS DURING THE EXPLOSIVE WELDING PROCESS
- Creators
- Colin Clarke Merriman
- Contributors
- David P Field (Advisor)William F. Cofer (Committee Member)Jow Lian Ding (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 267
- Identifiers
- 99900581640201842
- Language
- English
- Resource Type
- Dissertation