Hot tool steel H13 is a high-quality and widely used steel in engineering practice. In the thesis, we discussed its version made with additive technology, the so-called 3D printing of metal materials. As part of the experimental work, we performed measurements of thermal conductivity and specific heat and determined the temperature diffusivity at room temperature of steel produced with additive technology and compared them with the values for steel produced according to the classical procedure. Measurements, evaluation and analysis were performed on the Hot Disk TPS 2200 device for determining thermal properties in accordance with the ISO 22007-2 standard. The values of the thermal properties of H13 steel produced by the classic method are: thermal conductivity 26.81 W⠙m-1⠙K-1, specific heat 3.73 MJ⠙m-3⠙K-1 and temperature diffusivity 7.19 mm2⠙s-1. The values of the thermal properties of the H13 hot work steel produced with 3D printing are: First test: thermal conductivity 18.16 W⠙m-1⠙K-1, specific heat 3.57 MJ⠙m-3⠙K-1and temperature diffusivity 5.09 mm2⠙s-1, Second test: thermal conductivity 18.60 W⠙m-1⠙K-1, specific heat 3.64 MJ⠙m-3⠙K-1 and temperature diffusivity 5.11 mm2⠙s-1. We found that the thermal properties of H13 steel produced by 3D printing are lower than H13 steel produced by the classical method: thermal conductivity lower by 8.21 W⠙m-1⠙K-1, specific heat lower by 0.09 MJ⠙m-3⠙K-1 and temperature diffusivity smaller by 2.08 mm2⠙s-1. We conclude that the main reason is the presence of air bubbles or pores in the sample.
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