from the conferences organized by TANGER Ltd.
The results of a microstructure analysis and hardness investigations of the hypoeutectoid steels with 0.3 %Mo, imitating by its chemical composition toughening steels, are presented in the paper. The methodology of a dilatometric samples preparation and the method of the critical points determination were described. The paper presents metallographic research, as well as hardness measurements. For hypoeutectoid steels determined critical temperatures and appropriate austenitising temperatures. The austenitising temperature was defined in a standard way i. e. 30 °C÷50 °C higher than Ac3 temperature for hypoeutectoid steels. The technology of full annealing was proposed for the iron based alloy. The microstructure of the investigated material was examined by the light microscope Axiovert 200 MAT. The hardness measurements were performed with the Vickers HPO 250 type, which imposes a force equal to 10 kG and 30 kG. The dilatometric measurements were performed with the L78 R.I.T.A. dilatometer.
Keywords: Hypoeutectoid steel, microstructure, hardness, austenitising temperature, heat treatment© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.