Evaluación de la resistencia a la tracción y dureza del acero AISI/SAE 4140, tratado térmicamente por temple y revenido

Abstract

In the chapter I, we talk about the characteristics of AISI/SAE 4140 steel that should be taken into account for the manufacture of pieces and parts of the automotive industry and the effect of alloying on steel that are of great importance before perform a heat treatment. In the Chapter II, it mentions about the methods that are used to carry out the tempering and tempering heat treatment, in addition to the methods of tests of hardness and resistance to the traction for the obtaining of results together with the use and implementation of norms for each trial. The characteristics of the equipment used for the different tests are described. In the chapter III of the investigation we will talk about the process carried out for the thermal treatment of AISI / SAE 4140 steel quenched at 850 ° C and tempered at 300°C, 540 ° C, 590 ° C and 640 ° C. The chemical and mechanical properties were evaluated, reaching the point of performing tensile tests, hardness and microstructural analysis of the samples, taking into account the corresponding test standards allowing obtaining sufficient results to make a comparison between the proposed variables. In the chapter IV, of the values obtained through the tests carried out, the comparison of the values and evaluation of results is considered, where it was concluded that the tensile strength and hardness of the AISI / SAE 4140 steel increases as the tempering temperature decreases.