M. V. Maisuradze, M. A. Ryzhkov
INVESTIGATION OF THE MICROSTRUCTURAL BANDING IN STEEL 4140
The microstructural banding of the 4140 steel is studied. The dependence of the anisotropy index on the bar diameter and sampling location is established in accordance with GOST R 54570 (ASTM E 1268). A relationship between microstructural banding (i.e. anisotropy index) and toughness is shown to exist. A correlation between the kinetics of isothermal austenite transformation in the 4140 steel and the chemical inhomogeneity of the steel is discussed.
Keywords: 4140 steel, microstructural banding, anisotropy index, toughness, bainite transformation