Publicación: Evaluación del perfil de tensiones residuales por granallado en un acero SAE 5160H usando microdureza y difracción de rayos X
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2022
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Atribución-NoComercial-SinDerivadas 4.0 Internacional
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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['Universidad Nacional de Educación a Distancia (España)', 'Universidad Politécnica de Madrid. Departamento de Ingeniería Mecánica']
Resumen
Es aceptado que el granallado se realiza en metales para lograr un endurecimiento superficial que mejora la vida a fatiga de componentes de máquinas, en este caso aplicado a muestras de acero SAE5160H templado en aceite y revenido a 460 °C usado para resortes de ballesta. En este estudio, estas tensiones residuales se miden por medio de difracción de rayos X (DRX) y se mide la dureza en el área perpendicular a la superficie granallada usando una combinación de preparación metalográfica y microdureza Vickers. Con esta combinación de técnicas se consigue medir el efecto del granallado tanto en valor como en posición perpendicular a la superficie tratada. Para el material granallado, se obtuvo un promedio de -365.8 ± 78 MPa medidos por DRX y una microdureza máxima de 525± a 92.7 HVN en la superficie. De otro lado, para el material sin granallar se obtuvo un promedio de mientras que la muestra As presenta tensiones residuales positivas promedio de 54.2 ± 54.3 MPa medidos por DRX y 433 ± 39.5 HVN sin presentar una diferencia estadísticamente significativa en los puntos medidos. La técnica propuesta, ofrece la ventaja de realizar mediciones a través de la profundidad a intervalos tan pequeños como 10 μm con una preparación más simple, lo que le entrega ventajas sobre otras técnicas como la DRX o la perforación de hueco ciego.
It is accepted that shot peening is performed on metals to achieve surface hardening that improves the fatigue life of machine components; in this case, it was applied to samples made out of SAE5160H steel quenched and tempered in oil at 460 °C used for leaf springs. This study measures these residual stresses through X-ray diffraction (XRD). Moreover, hardness is measured on the perpendicular-to-the-peened surface using a combination of metallographic preparation and Vickers microhardness (HVN). With this combination of techniques, it is possible to measure the effect of shot blasting in value and perpendicular to the treated surface. For the shot peened material, an average of -365.8 ± 78 MPa measured by XRD and a maximum microhardness of 525± at 92.7 HVN on the surface were obtained. Alternatively, an average of 54.2 ± 54.3 MPa measured by XRD and 433 ± 39.5 HVN was obtained for the material without shot peening. At the same time, the same sample presented no statistically significant HVN difference in the measured points. The proposed technique offers the advantage of using measurements through depth at intervals as small as 10 μm with a more straightforward preparation, which gives it advantages over other techniques such as XRD or blind hole drilling.
It is accepted that shot peening is performed on metals to achieve surface hardening that improves the fatigue life of machine components; in this case, it was applied to samples made out of SAE5160H steel quenched and tempered in oil at 460 °C used for leaf springs. This study measures these residual stresses through X-ray diffraction (XRD). Moreover, hardness is measured on the perpendicular-to-the-peened surface using a combination of metallographic preparation and Vickers microhardness (HVN). With this combination of techniques, it is possible to measure the effect of shot blasting in value and perpendicular to the treated surface. For the shot peened material, an average of -365.8 ± 78 MPa measured by XRD and a maximum microhardness of 525± at 92.7 HVN on the surface were obtained. Alternatively, an average of 54.2 ± 54.3 MPa measured by XRD and 433 ± 39.5 HVN was obtained for the material without shot peening. At the same time, the same sample presented no statistically significant HVN difference in the measured points. The proposed technique offers the advantage of using measurements through depth at intervals as small as 10 μm with a more straightforward preparation, which gives it advantages over other techniques such as XRD or blind hole drilling.
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Categorías UNESCO
Palabras clave
granallado, microdureza Vickers, SAE 5160H, tensiones residuales, ballesta
Citación
Centro
Facultades y escuelas::E.T.S. de Ingenieros Industriales
Departamento
Mecánica