METAL-FORMING INVESTIGATIONS OF SPRAY-COMPACTED MATERIAL

The contrepoints of a composite research project are investigations regarding the isotropy of the spray-compacted material, its properties in comparison with conventional material, as well as problems in connection with hot and cold forming after spray compacting. The latter refer to sealing and welding of pores, smoothening of the surface, formation of a positive structure as well as production of a dimensionally accurate product. At an overall reduction of 60% the porosity is virtually eliminated, at higher rolling temperatures the yield, point and tensile strength reach values close to those of conventionally produced continuous casting. Positive strain levels are attained only after annealing of the spray-compacted and shaped material. Shearing tests of the double-layer material have shown that at increasing hot forming the strength of the composite layer reaches remarkable levels. Recommendations for the application of spray compacting.