Analysis of the microstructure of 37MnMo6-3 hypoeutectoid steel

Purpose: Present work corresponds to the research on the analysis of the microstructure of 37MnMo6-3 hypoeutectoid steel. Own research concerns the analysis of the influence of austenitizing temperature on the hardness of the 37MnMo6-3 hypoeutectoid test steel, and on the grain size of former austenite. The paper presents metallographic research, measurements of the average diameter of austenite grain, as well as hardness measurements. Design/methodology/approach: The austenitising temperature was defined in a standard way i.e. 30-50°C higher than Ac3 temperature for model alloy. A technique of full annealing was proposed for the model alloy. Metallographic examinations were performed on a Carl Zeiss light microscope Axiovert 200 MAT. Hardness measurements was performed with a Vickers apparatus of HPO 250 type, which imposes a force equal to 30 kG. Findings: Material for investigations was 37MnMo6-3 steel delivered in as-cast condition after casting in the Faculty of Foundry Engineering of AGH University of Science and Technology in Cracow then reforged in INTECH-MET S.C. in Gliwice. Research limitations/implications: The new Mn-Mo iron based model alloy. Practical implications: The paper contains a description of one from a group of iron based model alloys with 0.35-0.40% carbon content. According to PN-EN 10027 standard this steel should have a symbol 38MnNi6-4.