Diagnostics of composite castings, due to their complex structure, requires that their characteristics are tested by an appropriate description

method. Any deviation from the specific characteristic will be regarded as a material defect. The detection of defects in composite castings

sometimes is not sufficient and the defects have to be identified. This study classifies defects found in the structures of saturated metallic

composite castings and indicates those stages of the process where such defects are likely to be formed. Not only does the author

determine the causes of structural defects, describe methods of their detection and identification, but also proposes a schematic procedure

to be followed during detection and identification of structural defects of castings made from saturated reinforcement metallic composites.

Alloys examination was conducted after technological process, while using destructive (macroscopic tests, light and scanning electron

microscopy) and non-destructive (ultrasonic and X-ray defectoscopy, tomography, gravimetric method) methods. Research presented in

this article are part of author’s work on castings quality.

This article presents the results of tests carried out on rapid quenched Fe-based alloys. The alloys were made using an injection-casting method. The actual structure of the alloys was also studied using an indirect method, based on H. Kronmüller's theorem. Based on analysis of the primary magnetization curves, in accordance with the aforementioned theory, it was found that Mo causes a change in internal regions associated with changes in the direction of the magnetization vector. The evolution of the thermal properties with increasing volume of Mo has been confirmed by the DSC curves. Addition of Mo, at the expense of the Nb component, results in changes to the crystallization process (i.e. the crystallization onset temperature and number of stages). The study showed that the addition of Mo at the expense of Nb reduces glass forming ability. Based on the DSC analysis, free volumes were determined for the alloys tested. These values were compared with the analysis of primary magnetization curves. It was found that the DSC curves can be used to indirectly describe the structure of amorphous alloys similar to the theory of the approach to ferromagnetic saturation. This approach is new and can be used by many researchers in this field.