Ti-Al composite tube has the merits of high hardness, corrosion resistance, heat resistance and low specific gravity; and is widely used in aerospace industry, petroleum industry, and nuclear industry. Explosive welding is used to produce the Ti-Al composite tube in this paper. The effect of Sodium chloride emulsion explosive and detonation velocities on the interface characteristics are investigated. The bond interface wave and mechanical properties are analyzed. From the Scanning Electron Microscopy (SEM), it can be found that the interface is wavy, which can produce best welding characteristics. And detonation velocity has great effect on the bond interface wave. Mechanical tests including the flattening test, compression test, and bending test are conducted on the Ti-Al composite tube. Research showed that the interface bond properties and strength can fully withstand large plastic deformation.
Cryogenic treatment has been increasingly applied to enhance the hardness, antiwear ability and fatigue performance of die steel. On the basis of reading a large number of research papers and references across the world, the author makes a detailed analysis and brief summary of the influence of cryogenic treatment on microstructure after quenching process or quenching plus tempering process, on first and second carbides, on content of retained austenite, on surface hardness, on mechanical properties and antiwear ability of die steels. It's proved that cryogenic treatment on die steel significantly improves its hardness, antiwear capacity and service life. It's the cryogenic process to make die steel have higher hardness, better antiwear ability, better ductility and longer service life because cryogenic process actually has a good influence on die steel of its microstructure, retained austenite volume and amount and size of the second carbide.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.