Cryogenic treatments of hot work tool steel (56NiCrMoV7)‎

Abstract EN

The main objective of this paper is to study the effect of Cryogenic treatment of hot work tool steel type (56NiCrMoV7) on the microstructure and mechanical properties.

Three different temperatures (-50°C,-100°C and -150°C) were selected at different soaking time (1hr, 2hr and 3hr) respectively.

All cryogenic treatments were adopted after hardening by air & oil respectively.

It was concluded that the property enhancement for this tool steel can be attributed by conversion most of retained austenite to marten site accompanied with higher dislocations density that leads to the precipitation of fine carbide during the cryogenic treatment especially at the samples quenched by oil and treated at -150˚C) with soaking 1hr.)