ARRStamenković, UrošMarković, IvanaMladenović, SrbaManasijević, DraganNedeljković, MilanMilanović, Petar2025-05-082025-05-0820252535-01882535-017Xhttps://metalcasting.eu/sbornik/2025.pdfhttps://repozitorijum.tfbor.bg.ac.rs/handle/123456789/5962This paper investigates the effects of oil quenching and tempering at various temperatures on the mechanical and thermal properties of X155CrVMo12-1 tool steel. The steel specimens were austenitized at 1030 °C for half an hour, followed by quenching in oil and tempering at temperatures ranging from 50 °C to 700 °C. Mechanical properties were assessed by measuring the microhardness of the samples after each heat treatment. Thermal properties were investigated using the Xenon flash method (DXF analysis) to measure thermal diffusivity, thermal conductivity, and specific heat. The results show that the highest microhardness values were achieved after quenching, while the lowest values were observed for thermal diffusivity and thermal conductivity. Following quenching, the microhardness values gradually decreased with an increase in tempering temperature, whereas the values of thermal diffusivity and thermal conductivity increased. Even after tempering at 500 °C, the microhardness values remained quite high, with only a 23.41% decrease from the quenched state. Furthermore, there was a significant improvement in thermal properties, with thermal diffusivity increasing by 38.34% and thermal conductivity improving by 23.99%.enthermal diffusivitythermal conductivitymicrohardnessheat treatmentX155CrVMo12-1conferenceObject