info:eu-repo/semantics/bachelorThesis
Evaluación del efecto de la temperatura de calentamiento en el tamaño de grano y las propiedades mecánicas del acero AISI 1018 en condiciones de normalizado
Fecha
2022-12-01Registro en:
González Macas, Karina Elizabeth; Villarroel Pérez, Evelyn Paola. (2022). Evaluación del efecto de la temperatura de calentamiento en el tamaño de grano y las propiedades mecánicas del acero AISI 1018 en condiciones de normalizado. Escuela Superior Politécnica de Chimborazo. Riobamba.
Autor
González Macas, Karina Elizabeth
Villarroel Pérez, Evelyn Paola
Resumen
The objective of this technical project was to evaluate the effect of the heating temperature on the
grain size, tensile strength, hardness, and toughness of AISI 1018 steel, under normalized
conditions. Sixty specimens were obtained, which were divided into five groups of twelve
specimens, of which four were for traction, four for impact, and the last four for metallography
and hardness. The specimens were subjected to a heat treatment of regeneration annealing with a
residence time of two hours and then they were cooled in the air, the specimens intended for
metallography and Brinell hardness were prepared in the Materials laboratory of the Faculty of
Mechanics of the ESPOCH. The microstructures were analyzed and then the grain size was
calculated and the hardness was measured. In addition, tensile and tenacity tests were carried out
at the Carrocero Metal-Mechanical Productive Development Center in the province of
Tungurahua. All procedures were performed under ASTM standards. In the results obtained, grain
growth was evidenced by increasing the heating temperature, with this, the resistance and
hardness decreased, but the toughness increased. In addition, it was observed that, at very high
temperatures, close to the melting point, the structure and mechanical properties of the samples
deteriorated due to the presence of widmanstatten ferrite. Additionally, the sampling error of the
values of the quantitative variables of the tests carried out was determined, where errors of less
than 10% were obtained, for which it is concluded that the requirements established in the
standards used were met. It is recommended that in future research the heating temperature be
varied to know its level of impact on the variability of the mechanical properties of 1018 steel.