Development of quality control and structure parameters determination methods for large size products from sintered hard alloys WC-(Co+Ni+Cr) based on analysis of the ultrasonic oscillations spreading parameters

The object of research is hard alloys with a morphology the carbide phase skeleton structure, in which particles contact each other, and gaps between them are filled binder phase. mechanical service characteristics such materials depend on degree development structure. One most problematic areas lack non-destructive methods for determining parameters introduction techniques will allow obtaining objective information structure material using it to evaluate quality products. In course study, scattering elastic vibrations inhomogeneous media were determined. main hypothesis study assumption that processes energy dissipation occur both structural elements themselves (carbide grains bond areas) at their boundaries. Therefore, evaluation quantitative estimation parameters, assessing material. following chosen as characterizing propagation ultrasonic oscillations: speed oscillations propagation, background level relation amplitude bottom reflection, attenuation coefficient. determined compared products microstructure, by metallography statistical relationship As result, new control procedures have been developed. contiguity sintered cemented measuring oscillations. assessment porosity pore size less than 1 mm was carried out according results relative proposed one cycle flaw detection, 100% subjected. These introduced production rolls method controlled hot vacuum pressing. They become an integral part system rolls.