Abstract
AbstractThis 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.
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