اثر سرعت سرد شدن بر ريز ساختار و خواص مكانيكي فولاد ميكرو آلياژي كربن متوسط

Effect of Cooling Rate On Microstructure and Mechanical Properties of Micro-Alloyed Medium Carbon Steel

Microalloyed medium carbon steels have recently been used in the automotive industries, due to their low costs and high performances. Mechanical properties of these steels are controlled by controlling the chemical composition, preheating temperature and cooling rate. The aim of this research is to evaluate the effects of cooling rates on microstructure and mechanical properties of DIN: 38MnVS6 or ISO38MnVS6 steel. Various samples were produced by changing the primary temperature and the cooling rates. The results show that the primary temperature has no significant effect, but the cooling rate has the main effect on the mechanical properties of the steel. The optimum cooling rate is obtained as 1.5 °C/s. Due to the applied condition; the obtained mechanical properties of the steel are as below: Tensile strength 840 MPa, yield strength 600 MPa, elongation 20% and impact strength 80 J/cm^3.