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Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia
In this paper, C45 medium carbon tool steel was investigated after various heat treatments. The
thermal properties, specifically thermal diffusivity and thermal conductivity, were measured and
also the microstructure analysis was done on a light microscope. Heat treatment of the samples
included: 1) the normalization heat treatment at 900°C for one hour and cooling in the air; 2)
quenching the samples in water and in oil separately after reheating them at 880°C for one hour
and; 3) tempering the quenched samples at 200°C-350°C for 2 hours. The results show the
highest values of thermal properties for the normalized sample. Also, the lowest values were
recorded for the quenched samples, and the values of thermal properties for the tempered samples
are between the values of the quenched and normalized samples. Microstructure analysis shows a
typical ferrite-pearlite structure after normalization. Martensite appeared in the water-quenched
sample. However, the microstructure of the oil-hardened sample predominately consists of ferrite
and pearlite because the critical cooling rate was not reached. Tempered samples quenched in the
water had the microstructure of tempered martensite.
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