Effect Of Deformation on the Mechanical Properties of Hot Rolled AISI 4140 Steel
AbstractThe effects of deformation on the mechanical and microstructural properties of hot rolled AISI 4140 steel were investigated. The steel heated at 1200oC was hot rolled from the initial thickness of 160 mm to 15 mm, 10 mm and 6 mm after multiple-pass. Later, normalization and tempering heat treatments were applied to the hot rolled steels. Mechanical and microstructural characterization of as-hot rolled and tempered steels were determined experimentally. Tensile properties, hardness values and wear properties of the steels were determined with room temperature tensile tests, Brinell hardness measurements and wear tests, respectively. In addition, scanning electron microscope (SEM) was used to analyze the surface morphology of the steels. After tempering heat treatment, yield stress increases with increasing amount of hot deformation, while wear rate, ductility and toughness of the steels decrease with increasing amount of hot deformation. In addiditon, the hardness of the steels decreases after tempering heat treatment.