Abstract
The structure of the bonding zone in explosively welded joints of ferrite-pearlite steel (0,3 % C, 1,4 % Mn) as a target and austenitic nitrogen steel (0,64 % N, 18 % Cr, 12 % Mn) as a flyer was studied by transmission electron microscopy. For the observation of the flyer a model joint was prepared using equal plates of the Cr-Mn-N steel for the flyer and the target. The structure of both joints had a layer character. The bonding was realized by a thin layer containing ultra-fine equiaxial recrystallized grains: ferritic in the real joint and austenitic in the model joint. The flyer structure was built up by parallel layers of plastically deformed austenite. A combined action of plastic deformation and heating was found in the regions of target close to the interface. Depending on the local conditions it caused formation of dislocation cell structure, polygonisation or recrystallisation in the ferrite, partial dissolution of cementite and secondary precipitation of dispersed carbides. The structure of the target suffered only the influence of cold deformation at a distance larger than 0,3 to 0,5 mm from the interface, which caused martensitic transformation in the layer between 0,5 and 1,0 mm from the interface.
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