Abstract
The microstructure and properties of pure titanium (Ti)-carbon steel clad plate prepared using explosive welding were characterized. The bonding of the welding interface was inspected using C-scanning imaging technique. The microstructure and composition of the clad were characterized with optical microscopy and scanning electron microscopy. Mechanical and corrosion properties of the clad plate were investigated using tensile test, shearing test, and potentiodynamic polarization measurement. The results show that the pure titanium and carbon steel plate are joined successfully without visible defects. The interface wave is uniform. SEM observation and EDS analyses show that some melt blocks distribute at the interface waves vortices. Hardness testes results show that after heat treating, the hardness values in the titanium layer of the clad plate are similar to the original titanium plate, whereas the values at carbon steel layer increase from the interface to 300 μm away. Tensile and shearing test results indicate that the mechanical properties of the clad meet the requirements of ASTM B898 standard. Corrosion test shows that the Ecorr of the clad plate is more positive, and icorr is 1 order of magnitude lower compared to carbon steel material, suggesting that the corrosion resistance of clad plate is better than that of carbon steel material. These results suggest that the clad plate has good bonding quality and properties to meet the processing requirement and can be safely applicable in the petrochemical field.
Highlights
Received: 30 November 2021Titanium (Ti) and its alloy have excellent corrosion resistance, low density, high specific strength, and heat resistance; they are widely used in the aviation, aerospace, and petrochemical industries
During the explosive welding process, sufficient joining impact pressure is produced at the interface, ensuring the successful preparation of the clad plate [14]
To remove the work-hardening effect [12], the Ti-carbon steel clad plates are generally annealed at 550–650 ◦ C, to release the residual stress produced during welding
Summary
Titanium (Ti) and its alloy have excellent corrosion resistance, low density, high specific strength, and heat resistance; they are widely used in the aviation, aerospace, and petrochemical industries. Titanium exhibits excellent resistance to corrosion attack in many aggressive media and is deserving of close attention as a structural material in the design of chemical processing machinery. Lots of equipment manufacturers in petrochemical industry pay more attention to titanium-based materials. The price of titanium materials is high, which increases product cost of the equipment [1,2,3]. It limits the wide application of titanium. The technique to produce a reliable joint of titanium-based material to other metals is of great importance
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