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This paper investigates the influence of different cryogenic treatments vis-à-vis conventional vacuum heat treatment on the evolution of static mechanical properties and microstructure of hot die steel grade AISI–H13. Deep cryogenic treatment was performed under two different temperatures (−154 °C and −184 °C) and varying soak duration of 6, 21, and 36 h. The resultant mechanical properties were characterized in order to understand the influence of cryogenic treatment vis-à-vis vacuum heat treatment and tempering on the hardness, toughness and the tensile strength. The results showed that samples cryogenically treated at −154°C for a soak duration of 6 h and tempered at 620°C for 2 h had 3.1% higher hardness, samples cryogenically treated at −184 °C for a soak duration of 6 h and tempered at 620 °C for 2 h showed 69 % higher percentage elongation, 36% higher toughness (Charpy V–notch) and showed 12.8% reduction in tensile strength in comparison to conventionally treated samples. X-ray diffraction and field emission scanning electron microscopy techniques were utilized for confirmation of various phases and complex carbides, morphology of microstructure and morphology of fractured surfaces, respectively.

Evolution of mechanical properties and microstructure of differently cryogenically treated hot die steel AISI–H13