Tecnología Mecánica
URI permanente para esta colecciónhttp://hdl.handle.net/11349/1924
Examinar
Examinando Tecnología Mecánica por Materia "Abrasión"
Mostrando 1 - 2 de 2
- Resultados por página
- Opciones de ordenación
Ítem Influencia de un tratamiento isotérmico en la resistencia al desgaste según norma ASTM G-65 en un acero AISI SAE 1045Malaver Pinto, Jhon Fredy; Ubaque Castillo, Yurani Marlen; Bohorquez Avila, Carlos ArturoThe ongoing progress of automotive industry on the last few years has boosted the development of new materials and as a consequence there is improvement in mechanical characteristics and resistance to fatigue, which reduce the vehicles’ weight and the fuel consumption without affecting the passengers’ safety.The dual phase steels (DP) belong to the High-strength Low-Alloy group (HSLA), which is recognized by its properties of high strength and ductility, this combination of features is related with the volumetric fraction of the micro-constituents. Several sources suggest that high strength of the martensite does not guarantee good performance to abrasion, which is generated for its fragility.The main objective of this work is to analyze the influence of the micro structure: martensite-ferrite, martensite-ferrite-bainite in resistance to abrasion of steel AISI 1045. In order to obtain the microstructure, the material was exposed to a heat treatment with intercritical temperatures of 740°C and 770°C. Then isothermal process with temperatures of 450°C and 550°C with different times of sustenance. Once the microscopic test SEM and DRX were done, the bainite and martensire fraction are attained.The resistance to abrasive fatigue of the selected steel was obtained applying the ASTM-G65. Also was found that resistance to fatigue is directly related to the microstructure. On the other hand the volumetric loss of mass was found to be 15% higher than the same material without treatment.Ítem Rediseño y Fabricación de un Tribometro para Ensayos de Abrasión Húmeda Según la Norma ASTM G105Sepúlveda García, Daniel Fernando; Amado Vargas, Diego David; Dueñas Rojas, Jonny RicardoOne of the main problems that exist in the materials and that have existed from the beginning of the development of the humanity is the wear and tear. Laboratory tests have allowed the study and analysis of wear to classify abrasion resistant materials and extend the life of machines and tools, among others. In the present work the redesign, construction and commissioning of an abrasive wear test equipment was carried out, which was already being used at the Francisco José de Caldas District University, but had not been left in optimum conditions. The design of abrasive wear equipment is based on ASTM G105, which speaks of a standard method for testing wet sand / rubber disc. First is the design of the main components of the machine which are disk, lever arm system. Once this is designed, the analysis and calculation of: mechanisms and design of the other pieces is performed. After this, determine the size of the engine, and the system that regulates the necessary rpm stipulated by the standard. The construction of mechanical components and assembly of electrical systems is carried out, to finally give rise to the start of the machine that includes the test of the different mechanisms separately: mechanism of the arm system, motor and points tangent to the disk.