M398 Steel

Steel name: M398
Diagram No.: 9658
Type of diagram: CCT
Chemical composition in weight %: 2.72% C, 0.51% Si, 0.50% Mn, 20.07% Cr, 1.00% Mo, 7.22% V, 0.70% W
Steel group: PM tool steels
Note: Comparison of CCT diagrams of powder tool steel M398. Figure presents a comparison of two CCT diagrams. The diagram shown with solid lines represents the actual measured CCT diagram of M398 steel made based on the evaluation of cooling curves from dilatometric measurements. The dashed line shows the diagram, which is made based on simulated cooling curves from the JMatProŽ API v7.0 simulation software. Both diagrams are inserted into one figure for a simplified comparison of measured and simulated results. Cooling rates were determined during physical measurement and simulation in the range of rates from 100 C/s to the slowest 0.01 C/s. A total of eight dilation curves were evaluated for each pair of diagrams. Both produced CCT diagrams clearly demonstrate the presence of martensitic, bainitic, and pearlitic phases, while the simulated proportion of individual phases for selected cooling rates can be seen in Figure. Temperatures Ac1 and Ac3 were determined as an average value from all dilatometric measurements. The temperatures Ac1 and Ac3, marked with dashed lines, were provided automatically by the calculation software when the cooling simulation was performed. These values of the austenitization temperature were unchanged from the cooling rate. In the case of actual experiments, the temperatures of Ac1 and Ac3 vary slightly depending on the heating rate. This issue is dealt with in more detail [70]. From the diagram, we can determine the measured temperatures of Ac1 = 960 C and Ac3 = 1070 C. The simulated values of austenitization temperatures are Ac1 = 962 C and Ac3 = 1016 C.
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