Análise das propriedades mecânicas e metalúrgicas em eixos estriados aço SAE 1045 tratados termicamente pelo processo de têmpera por indução eletromagnética

Abstract

This paper presents a study on the adaptation of an electromagnetic induction quenching machine, which is used to temper thin helical plates to be used in the tempering of splined shaft tips, used in the junction between the engine and the axis of the helical components that make up the chupim that transports grain into the bulk silos produced by COFELMA Metallurgical Industry. The purpose of the paper is to be able to evaluate the metallurgical and mechanical properties of splined shafts, machined in SAE 1045 steel. After the induction hardening process on the splined axes, these were submitted to surface hardness tests longitudinally on the stretch marks, radial hardness in two cross sections and metallographic analysis of cross sections. After performing the surface hardness tests longitudinally and evaluating the values obtained and their distribution along the length, it was clear that the set of coils used did not provide an efficient tempering. Only one half of an axis had surface quenching, which was confirmed by the radial hardness values in the cross section and the presence of martensite in the observations of the metallographs made in these sections. Thus it can be seen that the modifications made to the equipment were not effective and significant changes should be made to the suitability of the process. Therefore, changes are recommended, such as: increase the flow of cooling fluid, the axes should be vertical, the speed of rotation should be higher and a two-turn coil should be used and should travel from the bottom up with the cooling system running right behind the coil.