Study on the relationship of interface morphology and mechanical properties of explosive welded titanium/duplex stainless steel

Abstract This study investigated the interface morphology and mechanical properties of titanium (TP 270C)/duplex stainless steel (SUS 821L1) near the lower limit of the explosive welding window. Seven samples with different welding parameters near the lower limit of the welding window were evaluated; the interface morphology was analyzed by optical microscopy (OM), scanning electron microscopy (SEM), computed tomography (CT), and smoothed particle hydrodynamics (SPH) simulation. The jet, interface shape, and temperature at the interface were obtained by simulation, demonstrating consistent interface shapes in the experimental results and simulation results. The energy produced at the interface was proportional to the element diffusion area. To assess the differences in mechanical properties between each sample, tensile shear tests and 90 bending tests were conducted.