Kinetics of Martensite Decomposition and Microstructure Stability of Ti-6246 during Rapid Heating to Service Temperatures

The aerospace alloy Ti-6246 was subjected to inductive heat treatments with high heating and quenching rates (up 1500 K/s) while being applied an in situ diffraction study at the HEMS beamline P07B DESY. Thereby, characterization of emerging phases possible any point process. treatment schedules include preparation samples by means a homogenization subsequent trigger α″-martensite formation. In order simulate fast reheating within scope application, were reheated upper range service temperatures (550–650 °C) rate 100 K/s. second design, homogenized quenched sample state exposed high-temperature tempering 840 °C, which aims for elimination α″. Again, same executed. With aim this approach, stability microstructure consisting α-Ti, β-Ti characterized. Further, martensite decomposition path analyzed. It shows two-tier nature, firstly approaching bcc β-unit cell low-temperature (<400 but subsequently transforming into hcp-like unit later on equilibrium α-Ti.