ARWHS, WWCHS, WIHS Steels

Steel name: ARWHS, WWCHS, WIHS
Diagram No.: 9454
Type of diagram: CCT
Chemical composition in weight %: See the table.
Base steel (22MnB5): 0.23% C, 0.27% Si, 1.22% Mn, 0.01% P, 0.20% Cr, 0.02% Mo, 0.04% Al, 0.0032% B
Steel group: Welding steels
Note: CCT diagrams for the bulk composition of the FZ of the (a) ARWHS and (b) WIHS samples. (c) and (d) show the predicted CCT diagrams for the bulk composition of the center of the FZ, and the FB of the WWCHS sample, respectively. The dotted arrow represents a cooling rate of 30 °C/s, with the starting and ending phases observed in each case also shown next to the dotted arrow. Although the Ac1 and Ac3 values were almost identical for the FZ and FB regions of the WWCHS sample, the starting microstructure in the FZ post-welding had a fully martensitic morphology because the Al that was diluting into the weld pool was trapped at the FB, which also had a higher W- and C-content that suppressed the formation of ferrite. Therefore, it can be assumed that during austenitization the FZ microstructure was purely austenitic leading to a fully martensitic microstructure after quenching. (M: Martensite).
Reference: Not shown in this demo version.

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