Investigation On Bonding Interface Of Explosive Welding Dissimilar Metal

In order to economize the precious rare metal materials and make the best of the physical, chemical and mechanical property of various metal materials, the problem of developing metal composite material has being emphasized. The same or different kind of big area metal plate can be firmly combined instantly by explosive welding, which especially has special advantage of producing the dissimilar metal transition joint and as a result gets the favor on the industry.Explosive welding is found by chance in producing practice and then utilized through its development. Heretofore, it has already formed a full theory system on mechanics, however the systemic experiment data on the aspects of microstructure of explosive weld interfacial zone are in short. For affording academic guidance for industry practice and making the bigger progress on industry production of explosive welding, in this paper, according to the fact that Titanium-steel and Aluminum-steel is for explosive welding, these two combination ( TA2- Q235B and L2- Q235B) is still selected for slanted explosive welding, Then the systemic research on waveform, plastic deformation, melt and diffusion of interfacial zone has been carried out. The results show: (1)With the increase of collision velocity Vp, interfacial shape changes from flat to little wave, medium wave and big wave in turn. The existence of waveform testifies that under explosive load flyer plate is of liquid state and explosive load itself possesses undulation characteristic.(2)Intense and manifold plastic deformation occurs in parent metal near interface zone, and deformation mostly fastens on eddy in front of wave. Deformation twins are observed in Q235B steel body, and adiabatic shear bands (ASB) in TA2 side are caused by plastic deformation under the high strain velocity, and at the same time ASBs play the role of crack source. (3)Melted body of interfacial zone of explosive welding TA2-Q235B is fastened on eddy in the front of wave, and melted body of L2-Q235B is found in the interface in the form of continuous interlayer or eddy, and melted body contain rigid and crisp inter-metallic compounds which assume mini-crystal or non-crystal.In this paper, influence of annealing on interfacial microstructure, crack character and microhardness variational characteristic, are studied to deeply understand deformation rule and melting characteristic. The resluts show:TA2-Q235B composite plate by explosive welding can obtain desired microstructure after annealing at 650°C for an hour, and L2-Q235B compositeplate can not run chronically above 200℃. Fracture in interface zone usually shows brittleness rupture, eddy and consecutive interlayer is of typical characteristic of casting microstructure. As a result of effect of explosive load, hardness value of parent body rises.In a word, TA2-Q235B and L2-Q235B by explosive welding are available, for then reason is that there are four correlative process mentioned above during explosive welding which makes contributions to the metallurgy combination of the interface.