Heat Treatment Application of Spring Steel
Esma KESKİN Hayrettin Ahlatçı Yunus Türen Mustafa Ali KÜÇÜK Yasin SUBAŞI
AbstractThe aim of this study was to investigate the effect of the material hardness and microstructural characterization of the spring steels having the qualities of 51CrV4, 54SiCr6, 55Cr3 and 60SiCr7 produced according to the heat treatment application conditions. Fragments cut to appropriate sizes from spring steels were subjected to hardening process for 1 hour and tempering temperature for 1.50 hour at austenitization temperature determined from Fe-C balance diagram. When the applied heat treatments were evaluated generally, no differences were observed in the structure of the spring steel as a result of the cooling of the oil and the cooling of the austenitization zone in different cooling environments resulted in differences depending on the internal structure of the mechanical properties. As a result of the cooling process, internal stresses occurred and the microstructure turned into a mantle, resulting in rigidity and brittleness. This martensite structure tempering process reduced the internal stresses of the metallic material, the hardness fell a little and softened.