DEVELOPMENT OF EXPLOSIVE TECHNIQUES IN METAL FORMING
Status Report No. 2, 1 Jan-30 Jun 1963
CENTRAL INST FOR INDUSTRIAL RESEARCH OSLO (NORWAY)
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The present research project comprises studies of explosive techniques for sheet metal forming, welding and compaction of powder. The more basic problems in these processes have been emphasized, but also are being studied. During the first year of the project, extensive preparations with respect to facilities, tooling etc. have taken place, but also systematic experimentation has reached a satisfactory stage of development. Preliminary studies of dynamic plasticity indicate that detailed information about instantaneous plastic deformation, shape of the cup, normal velocity of blank and horizontal velocity of bending wave can be obtained by means of the experimental technique chosen. The effect of shock intensity and high strain rates on structural changes in austenitic stainless steel SAE 304 have been shown to be appreciable. Improved x-ray techniques for identification of mechanical twins and other structural defects are being developed. Explosive welding of all combinations between stainless steel and aluminum have been studied. The occurence of brittle instrumentallic layers, local melting, recrystallization and ripple formation have been demonstrated.
- Fabrication Metallurgy