Precipitation in 18 wt% Ni maraging steel of grade 350

By R. Tewari, S. Mazumder, I. Batra, G. Dey, S. Banerjee. 2000

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The influence of aging temperature and aging time on the mechanical and tribological properties of selective laser melted maraging 18Ni-300 steel (2018, background): “Lower aging temperature (390 °C) resulted in under-aging featured by the precipitation of μ-, S- and X- intermetallic phases, while higher aging temperature (590 °C) led to over-aging featured by the decomposition of the Ni3 (Ti, Mo) [44,45] and the formation of extensive revered austenite phase as ”
Aging Behaviour and Mechanical Performance of 18-Ni 300 Steel Processed by Selective Laser Melting (2016, background): “Even though it is stated that martensite can form even after moderate cooling rates, in published research works either water cooling [2,4] or air cooling [5,8] were adopted.”
Predicting microstructure and strength of maraging steels: Elemental optimisation (2016, background): “[45] showed that Fe2 Mo intermetallics form at temperatures below 500 °C and after 100 h of ageing due to the low diffusivity of Mo in Fe.”
Steels in additive manufacturing: A review of their microstructure and properties (2020, background): “The precipitation sequence upon post-AM-process aging heat treatment of L-PBF-produced maraging samples is comparable to conventionally produced maraging steels [115,140,141]: first, spherical Ni3X precipitates (η-phase) are formed with X being Ti, Al, Mo [114,119,122, 124,130] followed by Fe7Mo6 (μ”