Caracterização mecânica e Levantamento da curva Jominy do aço SAE 1644 produzido em uma siderúrgica local

Abstract

Since the beginning of the production of steel, a varied amount of steels has been developed. For each type of steel have characteristics, applications, different chemical compositions and properties. Thus a more viable alternative to the study of this wide variety of steel would be an analysis of their properties, whether physical, chemical and mechanical in this way is of great importance a rich mechanical characterization in all aspects of engineering study, balancing the interests engineering with the consumer market interests. On the other hand the hardenability of steels has extreme value as resistance and hardness of steels orientation, analyzing the steel hardenability, verified by the depth and distribution of hardness achieved by heat treating tempering. This work focuses on accompanied mechanical characterization of lifting the steel hardenability capacity SAE 1644, aiming to obtain characteristic properties through hardness test, impact test, bending test, tensile testing, and analysis microstructural and chemical followed by a survey of hardenability curve by Jominy method. The results show various properties of steel, as the characteristic of brittle fracture by cleavage and the presence of vanadium precipitates distributed unevenly throughout its microstructure, we also have the visualization of high hardenability steel capacity seen his big win hardness the cross section of 22.25 to about 58.56 HRC HRC. The mechanical properties were satisfactory with 555.30 MPa tensile strength as the steel has not undergone any refining. The Jominy curve reveals that the steel has a large hardenability, proving the great importance of research in this area addressed.