Abstract
In this work, T2 red copper and high nitrogen austenitic stainless steel (HNASS) were explosively welded for the first time. The welding window was theoretically developed, and the experiment was designed by considering the effect of explosive loading on welding quality. To evaluate the welding quality, the microstructure and mechanical properties of the composite material were systematically investigated. The results showed that the welding quality was in good agreement with the results predicted by the welding window. The micromorphology of the welding interface changed with a varied welding parameter, and no intermetallic compounds were found at the welding interface by EDS analysis. The microhardness of the two raw materials both increased near the welding interface, and the enhancement increased with the explosive loading. The failure pattern of the welding interface in the tension-shear experiments was dominated by the strength failure of the red copper.
Highlights
Copper/steel composite has the advantages of corrosion-resistance and the high toughness of copper, and good welding capacity, formability, elongation and the thermal conductivity of steel
T2 red copper/high nitrogen austenite stainless steel (HNASS) composites were manufactured by explosive welding using different explosive welding parameters, and the microstructure and mechanical properties of T2 red copper/HNASS
A T2 red copper/HNASS composite could be successfully obtained by the explosive welding method if the proper explosive welding parameters were adopted, and the lower boundary should be calculated considering the mechanical parameters of HNASS
Summary
Copper/steel composite has the advantages of corrosion-resistance and the high toughness of copper, and good welding capacity, formability, elongation and the thermal conductivity of steel. Copper/steel composite has received widespread attention and been used for cooling staves in the blast furnace [1]. Compared with ordinary stainless steel, high nitrogen austenite stainless steel (HNASS) containing more than 0.4% nitrogen shows excellent performances such as higher strength, wear resistance, corrosion resistance toughness, and plasticity [2]. HNASSCopper/high nitrogen steel composites will have better mechanical properties. At present, welding technologies such as ultrasonic welding, diffusion welding, laser welding, friction welding and explosion welding are applied to prepare dissimilar metal composites. Compared with other welding methods, explosive welding is a better choice for manufacturing composites with large areas
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