Mold Powder Slags

Name: Mold Powder Slags
Diagram No.: 1166
Type of diagram: CCT, TTT
Chemical composition in weight %: See the table
Group: Slags
Note: The predicted TTT diagrams for both powders are quite similar at temperatures below 600C, but above 700C they exhibit differences, particularly in regard to the conclusion of crystallization. According to the diagrams, powder B requires considerably longer times to accomplish crystallization at temperatures between 800C and 900C. The predicted similarities and differences in the TTT diagrams are validated by the metallographic analysis of isothermally treated disks presented in the following section.

The letters plotted in Figures 6 and 7 indicate the temperatures and times of the isothermal plateaus at which a thin region of the glass disks was subjected while seated on the hot plate; lowercase letters designate the treatments of mold powder A, and uppercase letters those for mold powder B. Corresponding lowmagnification stereoscopic images of the entire longitudinal cross-section of treated disks, together with photomicrographs taken within the isothermal region. Agreeing with the TTT diagrams, the microstructures a, b, c, and d are very similar to those observed in the photomicrographs A, B, C and D. As expected from the TTT diagrams, the photomicrographs a, b, c, A, B and C show almost completely uniform glassy structures except for some bright spots that appear commonly in samples that are just starting to crystallize. These spots are minute regions, rich in iron, that form early in the process and that possibly act as nucleation sites for cuspidine.

Reference: Not shown in this demo version.

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