Studying the Effect of Duplex Quenching on Wear Behavior of CK45

Attention has been given to the development of wear behavior for the CK45 steel by employing duplex quenching inter critical heat treatment which were investigated in this paper. The specimens were treated by single quenching and duplex quenching respectively. Single quenching was performed in α+γ region at 750, 800 and 850℃ and then quenching in oil. The duplex quenching was firstly heated at 900℃ and quenching in oil, and secondly the specimens reheated at 750, 800 and 850℃ and quenching in oil. Microstructure examination for the specimens single and duplex quenched was analyzed using optical microscope. Hardness test was done using Vickers hardness test. While wear test was done for the specimens (single and duplex quenching) using pin-on-disc machine by changing loads 5, 10, 15, 20 and 25N with sliding time 10 min, and at different sliding time 5, 10, 15, 20, 25and 30 min with constant load 15N.The results of this investigation show that the duplex quenching in oil decreasing wear art because of the martensitic volume fraction for duplex quenching higher than for single quenching, this in turn increases the Vickers hardness number.