Análisis de la variación de la resistencia a la torsión del acero AISI/SAE 4140 tratado térmicamente por temple a dos diferentes temperaturas de 830°C, 860°C y revenido a una temperatura de 500°C.

Abstract

The steel AISI / SAE 4140 is a steel very used in the industrial sector, where there are companies that use mechanical elements which are subjected to combined efforts and not very high loads, among these components are parts of automotive, transmission shafts, axles, cranks, crankshafts, bolts grade 6, transmission gears, pistons that in state of supply can be considered for a design but saw the need to improve the mechanical property of the steel to the torsion, obtaining better strength. In the following work the analysis of the variation of the resistance to the torsion of the steel AISI / SAE 4140 heat treated by hardening at two different temperatures of 830 ° C, 860 ° C and tempered at a temperature of 500 ° C is performed. For this, first, the specification of material is made by submitting the steel to spectrophotometric test, hardness test, tensile test and torsion test in the state of supply to verify the mechanical properties and chemical composition exposed by the supplier. Once the steel specification has been made, the specimens are heat treated by quenching at 830 ° C, 860 ° C and tempering at 500 ° C. Then, the torsion test is performed on the thermally treated specimens, obtaining data to perform the analysis and comparison with the data obtained in the state of supply. The results obtained through the elaboration of this work will allow to appreciate that the heat treated specimens increase considerably their resistance to torsion in comparison to the specimens in the state of supply.