Influencia del cobre en la obtención de fundición nodular para alcanzar el grado 65-45-12 bajo la Norma NTE INEN 2499-2009 en la empresa Fundi Laser

Abstract

The research work was carried out to analyze the influence of copper from 0.01% copper to 0.05% copper and to determine which of these percentages can reach the 60- 45-12 degree of the NTE INEN 2499 standard which determines the range according to its mechanical properties of Tensile Strength, Fluency Limit and Elongation Percentage. The specimens of nodular iron plus copper were made to perform the tensile test under the ASTM E-8 standard, once the mechanical properties were evaluated, it was determined that with the 0.02% copper the grade was reached 60-45- 12. The spectrometry, hardness, microstructure and fractography tests were carried out on the sample with 0.02% copper to observe the characteristics of the material. With the analyzes was obtained a tensile strength of 739.85 MPa, a Fluence Limit of 313.57 MPa, 12.82 Elongation Percentage, a hardness of 202 Brinell, large nodular grain size 100 μm, medium grain of 94.05 μm and small grain of 66.91 μm and when analyzing the fractography a fragile fracture was observed that occurs before or during the moment in which plastic deformation occurs, the fracture occurs in non-crystalline materials and application of very high stresses.