Análise das propriedades mecânicas e microestruturais de um ferro fundido nodular GGG-40 obtidos por dois carregamentos diferentes de fusão

Abstract

The development of new alloys has become of great importance to technological progress, considering the need to create raw materials to supply machines and equipment production, that nowadays has been more required, combined with the optimization of processes and products, this is the search for alternatives that are economically viable. The scenario of the automobile industry, which values quality and safety, promotes researches seeking an attractive differential within the standards to surprise its customers. This work aims to evaluate the differences between the mechanical and microstructural properties when the raw materials to obtain ductile iron GGG-40 vary, with a load of 50% steel scrap plus 50% pig iron, and another with a lower percentage, 20% steel scrap and 80% pig iron, in the production of an axle for the automobile industry. To correlate this variable with technical studies and mechanical properties were executed chemistry analysis, tensile test, metallographic analysis, hardness test and ultrasound test. In the end, it was decided to manufacture the axle using the load of 80% of pig iron, as it fulfills the necessary requirements when presenting a ferritic matrix and reaching the requested elongation by SAE J434.