Experimental and numerical investigation of microstructure and mechanical behavior of titanium/steel interfaces prepared by explosive welding

This paper presents a systematic study of structure and mechanical behavior of Ti/Fe explosive-bonded interfaces. The transient fluid-like behavior at the bonding zone is simulated using Smoothed Particle Hydrodynamic (SPH) numerical method. The interface is featured by a wave structure, resulted fr...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-03, Vol.689, p.323-331
Main Authors: Chu, Qiaoling, Zhang, Min, Li, Jihong, Yan, Cheng
Format: Article
Language:English
Subjects:
Bonded joints
Computer simulation
Explosive bonding
Explosive forming
Explosive welding
Grains
Intermetallic compounds
Intermetallics
Iron
Mechanical properties
Microstructure
Nanoindentation
Numerical analysis
Plastic deformation
Recrystallization
Smoothed Particle hydrodynamic
Strain
Welding
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Summary:This paper presents a systematic study of structure and mechanical behavior of Ti/Fe explosive-bonded interfaces. The transient fluid-like behavior at the bonding zone is simulated using Smoothed Particle Hydrodynamic (SPH) numerical method. The interface is featured by a wave structure, resulted from heavy plastic deformation during the explosive welding. Melted zone resulted from the trapped jetting is surrounded by strongly deformed bulk materials. Fe2Ti intermetallic compounds with a mixture of FeTi+Fe phases are observed in the melted zone. A reaction layer (~700nm) consisted of nano-sized FeTi grains is formed at Ti/Fe material boundary. Nanoindentation tests and fracture observation confirm the brittle nature of Fe-Ti intermetallics formed in the explosive-bonded joint. Extremely temperature accumulated near the interface leads to recovery and recrystallization in deformed grains, which can accommodate relatively large strain near the interface.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.02.075