Authors
1 Production and Metallurgy Engineering Department, University of Technology/ Baghdad
2 *Production and Metallurgy Engineering Department, University of Technology/ Baghdad
Abstract
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 temperature (-50°C,-100°C & -150°C)
were selected at different soaking time(1hr,2hr & 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 martensite accompanied with higher
dislocations density that leads to the precipitation of fine carbide during the
cryogenic treatment especially at the samples quenched by oil & treated at (-
150°C) with soaking 1hr
)
