da/dN	fatigue crack growth rate
σy	yield strength in quasi-static tension
σu	ultimate tensile strength in quasi-static tension
A	% elongation
R	stress ratio
Mf	martensite finish temperature
ΔK	stress intensity factor range
AC	air cooling
COD	crack opening displacement
CT	cryogenic treatment
DCT	deep cryogenic treatment
EDS	energy dispersive X-ray spectroscopy
FCP	fatigue crack propagation
HCF	high cycle fatigue
HT	heat treatment
MA	mill annealed
RT	room temperature
SEM	scanning electron microscope
WQ	water quenching
ASTM	American society for testing and materials