Effect of Austenite Grain Size on Mechanical Behavior for AISI 1045 and 4140 Steels by Experimentation and Modeling.
Abstract
Medium-carbon steels are widely used in the making of mechanical pieces and components, such as gears, shafts, bolts, couplings, spindles, sprockets, connecting rods and crankshafts, because of their good mechanical resistance, toughness, and wear resistance. Many research has been focused on studying the behavior of wearing off, deformation and analysis of mechanical properties at high temperatures. However, little has been studied about evaluating its mechanical behavior related to the austenitic grain size (AGS). In this research, experimental results of the effect of AGS before quenched of two medium-C steels AISI 1045 y 4140, are presented through the numerical modeling, in order to determine the optimal processing conditions to obtain the desired mechanical properties. The grain size was evaluated between 5 y 110 µm. Experimental techniques were used to determine the microstructure, tensile strength, yield strength, hardness, and dilatometry to determine its deformation. The simulated results were obtained through the JMatPro. From the results, it can be mentioned that the AGS has an important role in the evolution of mechanical properties for the studied steels. When the AGS was higher than 15 and 45 µm for the steels AISI 4140 and 1045 respectively, the mechanical properties were in higher levels. The results through JMatPro were very close to the ones obtained experimentally, validating the numeric simulation in the prediction of the studied mechanical properties.
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References
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