The effect of austenitization temperature, aging temperature, and, aging time on the development of precipitates in a novel maraging steel known as F1E was investigated. The investigation primarily employed small angle neutron scattering (SANS) coupled with thermal calculations, atom probe tomography (APT) and electron microscopy (SEM, STEM, TEM). This large scale study investigated austenitization temperatures of 825, 870 and 960°C with aging of 0, 1, 2.5, 5, 7.5, 10 and 24 hrs conducted at

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... °C. For austenitization at 960°C, aging at 520°C and 560°C was also conducted for the same aging times. This yielded 32 conditions where the size, shape and volume fraction of three different precipitates were determined, namely a pre-existing laves phase, a developing laves phase, and a developing β phase. Also observed in this study was a significant change in microstructure of the preexisting laves precipitate as a result of aging time. Highlights  Large scale study of precipitate growth (laves and β phase) in a novel maraging steel integrating knowledge from APT, TEM, SEM, and STEM into SANS modelling and analysis  Effect of 3 different austenitization temperatures studied  Effect of 3 different aging temperatures studied  Effect of aging time studied at 0, 1, 2.5, 5, 7.5, 10 and 24 hrs  Laves phase precipitate undergoes previously unknown microstructural change during aging