Figure 8: Synchrotron X-ray diffraction patterns of the as-sintered, as-quenched, and as-aged condition in the process of forming Ti-6Al-4V with a bi-modal microstructure.
From: Hydrogen-enabled microstructure and fatigue strength engineering of titanium alloys
The disappearance of the β peaks in the as-quenched condition and reappearance in the as-aged condition is clear evidence of diffusionless transformation of the β grains into martensite during the water quenching process and subsequent transformation of martensite into α colonies during ageing.
