Residual Stress Development in Explosive-Bonded Bi-Metal Composite Materials

摘要

One of the main obstacles of applying explosive welding for improved mechanical and corrosion properties of the materials may be residual stress contour at the interface to be bonded, as this may be detrimental to the life of the vehicles. For this reason, it is important to study the distribution of the residual stress over the welded material, especially at the interface area. Similar and dissimilar steel plate materials possessing different chemistries, mechanical properties and thicknesses, were explosive welded to successfully produce bi-metallic plates. Neutron diffraction experiments were undertaken to investigate the residual stress development in these bi-metallic plates. The characteristic residual stress formations in the plate systems were observed to be influenced by microstructural evolution at the weld interface as well as the mechanical properties and thicknesses of the original plate materials. It was found that explosive welded plates have tensile residual stresses in both the longitudinal and transverse direction at the interface. The level of these stresses is close to yield.