Title of article :
The Effect of Cooling Rate on Microstructure and Mechanical Properties of GS20Mn5 Steel Used for Manufacturing of Cast Bogie
Author/Authors :
Hasanpour, Mohammad School of Metallurgy and Materials Engineering - Iran University of Science and Technology - Narmak, Tehran , Owhadi, Amin School of Railway Engineering - Iran University of Science and Technology - Narmak, Tehran , Boutorabi, Mohammad Ali School of Metallurgy and Materials Engineering - Iran University of Science and Technology - Narmak, Tehran
Abstract :
The GS20Mn5 steel is a low carbon manganese steel used for cast freight
bogies manufacturing. The impact toughness of such steels for freight
bogie solebars must be at least 17J/cm2 at -60°C according to GOST32400
standard. In the present work, the effect of cooling rate after the
austenitizing at two temperatures on the structure and mechanical
properties of GS20Mn5 steel is investigated, including toughness at -60°C.
The cooling rate varies from 1 to 5.4°C/Sec. The optimum toughness and
strength are observed after two hour austenitizing at 930°C and quenching
rate of 2.8°C/Sec where the impact energy mean values reached 32J/cm2
at -60°C.
Keywords :
Heat treatment , Low temperature , Mechanical properties , Cast Bogie , GS20Mn5 steel
