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Vol 14, Issue 1, 2023
Pages: 125 - 132
Research article
Metallic materials
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Published: 01.05.2023. Research article Metallic materials

THE INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE AND THERMAL PROPERTIES OF C45 TOOL STEEL

By
Uroš Stamenković ,
Uroš Stamenković
Contact Uroš Stamenković

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Ivana Marković ,
Ivana Marković

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Srba Mladenović ,
Srba Mladenović

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Dragan Manasijević ,
Dragan Manasijević

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Ljubiša Balanović ,
Ljubiša Balanović

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Avram Kovačević ,
Avram Kovačević

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Milan Nedeljković ,
Milan Nedeljković

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Jovana Božinović
Jovana Božinović

Technical Faculty in Bor, University of Belgrade , Belgrade , Serbia

Abstract

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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