Ingeniería Mecánica

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Subject: search.filters.subject.FUNDICIÓN NODULAR

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    Influencia de las microaleaciones (SNAM MG9011 y SNAM MG9033LA) en el proceso de obtención de fundición nodular (NTE INEN 2499-2009) para determinar las propiedades mecánicas, en la empresa Fundi Laser
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Mecánica, 2020-10) Villagran Ortiz, Jairo Fabricio; Paredes Salinas, Juan Gilberto
    In thisexperimetal work, the nodular iron specimens were modeled, cast and mechanized with percentages of 1.1, 1.3, 1.5 and 1.7 percent SNAM MG9011 and 0.77 percent SNAM MG9033LA to perform the tensile test under ASTM E-8 and NTE INEN standards. -ISO 6892-1 and hardness tests under ASTM E-10, once the results were evaluated, the groups of 1.1 percent SNAM MG9011 and 0.77 percent SNAM MG9033LA were classified in grade 65-45-12. Spectrometry tests were performed in the 1.1 percent SNAM MG9011 and 0.77 percent SNAM MG9033LA groups, to verify their chemical composition under the parameters established in different bibliographies. Metallography tests were performed on all groups of SNAM MG9011 and SNAM MG9033LA specimens, to observe the effects produced on the microstructure. A tensile strength of 693.23 Megapascals, fluency limit 395.72 Megapascals, elongation percentage 12.23 percent, Brinell hardness of 187.36, large nodular grain size 148 micrometers, average 113 micrometers and small 53 micrometers were obtained for SNAM MG9011 1.1 percent and for 0.77 percent SNAM MG9033LA a tensile strength of 678.61 Megapascals, fluency limit 404.61 Megapascals, elongation percentage 15.78 percent, a Brinell hardness of 228.20, large nodular grain size 153.5 micrometers, average 128 micrometers and small 70.50 micrometers. In both cases, the graphite is shown in its microstructure, perfectly forming nodules.
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    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
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica. Carrera de Ingeniería Mecánica, 2018) Naranjo Tirado, Marco Antonio; Paredes Salinas, Juan Gilberto
    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.