fig3
Figure 3. Evolution of the volume fraction of the BCC phase (martensite + bainitic ferrite) in DIH processes with holding temperature of (A) 300 °C (above Ms); and (B) 250 °C; (C) 230 °C; and (D) 200 °C (below Ms). VBCC-c: Volume fraction of BCC formed during cooling; SEM: Scanning electron microscope; VBCC-f: Volume fraction of BCC at ambient temperature after the process. BCC: body-centered cubic; DIH: direct isothermal holding; Ms: martensite start temperature.
