Study of the influence of titanium interlayer on formation of AlMg6 – 12Cr18Ni10Ti weld interface during explosive welding

This paper presents the aspects of the formation of multilayer composite material (MCM) consisting of aluminium-magnesium alloy AlMg6, titanium VT1-0 and austenitic stainless steel 12Cr18Ni10Тi during explosive welding. This MCM has promising properties for use in various industries such as shipbuilding and automobile manufacturing. However, the production of this material presents certain difficulties due to different properties of the initial materials. In this paper, the effect of residual stresses occurring in MCM after explosive welding on the continuity of the joint was investigated. Using metallographic studies and electron microscopy, it was found that the high velocity impact process between different materials comprising MCM formed weld interfaces with straight and wavy profiles. There was also evidence of dynamic recrystallisation at the 12Cr18Ni10Ti–VT1-0 weld interface and the formation of vortex zones in wave crests. The microhardness of the layers was also measured. The measurement showed that hardening occurred in MCM layers with the maximum value in the 12Cr18Ni10Ti steel layer. The evaluation of tear strength revealed that the formation of cracks occurred at the interface between the VT1-0–AlMg6 weld interface, with an average strength of 160 MPa. The results of the study may be useful to specialists in materials science, mechanical engineering and other related fields