Unlike the tempered martensitic microstructure formed in conventionally heat-treated steel, LPBF-produced steel develops a high-temperature δ-ferrite phase-based microstructure due to its ...

At cooling rates faster than 140 C/s the transition is to a metastable material known as martensite. Between 35 and 140 C/s the system at room temperature is a mixture of these two materials. The ...

SOME observations were made of the effect of heating rate on the martensite (M)→austenite (γ) reversion in a 300-grade 18 per cent nickel maraging steel. These are discussed here with reference ...