Mold Powder Slags

Name: Mold Powder Slags
Diagram No.: 1167
Type of diagram: TTT
Chemical composition in weight %: See the table
Group: Slags
Note: TTT diagrams for: a) powder A and b) powder B.
Figures 8(a) and 8(b) present the TTT diagrams calculated from Eq. (18) for slags A and B, respectively. The calculated lines correspond to conversion fractions, x, equal to 0.01 and 0.99 of the crystalline phases associated with each of the peaks appearing on the DSC traces. For both slags, the estimated TTT diagrams predict that over a certain intermediate temperature range, the isothermal transformation starts very quickly. However, the nose tip is considerably larger for slag B than for slag A, indicating its higher tendency to crystallize very rapidly over a wider temperature range. According to its diagram slag B starts crystallization in <0.6 s (<0.01 min) at temperatures between 983 K 1338 K (710C - 1065C); this range is considerably narrower for slag A. The line for x= 0.01 corresponding to Ph,1 (peak 1 of heating devitrification) is slightly displaced farther to the right in the case of slag A than in case of slag B, and this displacement is more noticeable for the curves associated to Pc,1 (peak 1 of cooling crystallization). In particular, the line marking the end of crystallization (i.e., x= 0.99) of the crystalline phase(s) associated with Pc,1 is reached in a considerably shorter time for slag B than for slag A.
Reference: Not shown in this demo version.

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