Study of microstructure and thermal properties of as-cast high carbon and high chromium tool steel
Keywords:high alloy tool steel, scanning electron microscopy, thermal conductivity, differential scanning calorimetry, as-cast
This work aims to investigate the microstructural and thermal properties of as-cast high carbon and high chromium cold work tool steel. The microstructure was investigated by using scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction (XRD) method. It was determined that at room temperature the microstructure of the investigated tool steel includes a lamellar network of M7C3 carbide precipitates along grain boundaries of ferrite grains in the base. Thermal diffusivity, specific heat capacity and thermal conductivity of the investigated steel alloy were determined in the temperature interval from 25 to 400 °C by using the laser-flash method. Thermal conductivity increases from 24.9 at 25 °C to 26.9 W/m ·K at 400 °C. Phase transition temperatures in the temperature region from room temperature to 1250 °C were experimentally determined using differential scanning calorimetry (DSC). One endothermic effect in the temperature interval from 803 to 820 °C, corresponding to the ferrite/austenite phase transformation, was detected during sample heating. Experimental results were compared with the results of phase equilibria calculations obtained from the ThermoCalc software and TCFE6 database.
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Copyright (c) 2018 Dragan Miroslav Manasijevic, Žarko Radović, Nada Å trbac, Ljubiša Balanović, Uroš Stamenković, Milan Gorgievski, Duško Minić, Milena Premović, Tamara Holjevac Grgurić, Nebojša Tadić
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