INFLUENCE OF THE THERMAL CONDITION OF STEEL ON THE TRANSFORMATION TEMPERATURES OF TWO CHROMIUM HOT-WORK TOOL STEELS

The influence of the thermal condition steel on transformation temperatures two chromium hot-work tool steels was investigated. studied were in different states: soft -annealed state and hardened-and-tempered state. soft-annealed condition, i.e., fully annealed is a which matrix ferritic, carbon chemically bonded spherical carbides. other hand, means martensitic with uniformly distributed (primary secondary) samples analysed simultaneous analyser (STA) using differential scanning calorimetry (DSC) method to determine temperatures. We also performed calculations based CALPHAD obtain equilibrium transformations. aim study conditions such as solidus/liquidus temperatures, eutectoid (A1 A3), austenite solidification temperature martensite start Since DSC analysis measures influence, we able energies absorbed during melting (endothermic processes) released δ-ferrite γ-austenite (exothermic processes), well transformation. It found that hardening tempering reduce both intervals are closer those calculated. From an energetic point view, melting.