The effect of austenitizing temperature and Cr, Mo and Mn addition on microstructure and mechanica
properties of V microalloyed medium carbon steel has been studied by means of metallography and mechanica
testing. The addition of Cr, Mn and Mo leads to a decrease in yield strength (YS) by approximate 100 MPa in
comparison to the base steel. It is assumed that Mn and Mo increase hardenability by promoting the formation
of bainitic sheaves (BS), i.e. by suppressing the formation of ferrite-pearlite and acicular ferrite (FP-AF). Cr
at the level used in this work is not that effective. Presence and packet size of bainitic sheaves decrease
the Charpy V-notch impact energy at 20 ◦C (CVN20) in comparison to ferrite-pearlite and acicular ferrite
microstructures.