The effect of low temperatures on the operability of products 20GL steel

Abstract

Abstract The influence of low temperatures on the cold brittleness of 20GL steel is considered. Tests were carried out on the impact strength of samples of 20GL steel in the temperature range from t = - 60 ° C to a temperature of t = 20 ° C. Fractographic studies of fractures were carried out using optical and electron microscopy. The studies were carried out after normalization, as well as after thermocyclic treatment. The research results showed that thermocyclic treatment leads to an increase in strength characteristics, grain refinement. At the same time, the temperature of the brittle-viscous transition is slightly shifted to the region of positive temperatures.