Análisis de la micro y macrodeformación en probetas de acero 1.25Cr 0.5Mo sometidas a fluencia lenta
Fecha
2014-07-20
Autores
Cruz Cárdenas, Ernesto
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Editor
Universidad Central "Marta Abreu" de Las Villas
Resumen
Se presenta un análisis del comportamiento de la deformación plástica a nivel macro y microestructural en acero 1.25Cr 0.5Mo expuesto a condiciones de trabajo de 480 oC por 20 años y sometido a tratamiento térmico (700 oC, 1.5h). Se aplican ensayos de fluencia lenta con una matriz que comprende temperaturas entre 525 y 600 oC y tensiones entre 100 y 175 MPa. Para evaluar la
macrodeformación se analizan las curvas de fluencia lenta; mientras que la microdeformación se estudia sobre la base del grado de deformación microestructural. La reducción del área para el material envejecido en servicio fue entre 71 y 88%; la cual se reduce a 82 y 91% por efecto del tratamiento térmico. Mientras que para el alargamiento los rangos fueron de 19 y 57% y 46 y 61% respectivamente. Se verifica un comportamiento lineal entre el alargamiento y la temperatura; así como entre el grado de orientación microestructural y los parámetros de ductilidad.
It is presented an analysis of the behavior of the plastic level deformation macro and microestructural in steel 1.25Cr 0.5Mo exposed to working conditions of 480 oC for 20 years and submitted to heat treatment ( 700 oC, 1.5h ). The essays of creep with a womb that comprises temperatures between 525 and 600 oC and tensions between 100 and 175 MPa are applicable themselves. In order to evaluate the macrodeformation they analyze the curves of creep; while the microdeformation is studied on the basis of the degree of deformation microestructural itself. The reduction of the area for the aged material in use was between 71 and 88 %; which shortens 82 and 91 % for the effect of heat treatment itself. While for the lengthening the status belonged to 19 and 57 % and 46 and 61 % respectively. A linear behavior between the lengthening and the temperature is verified; and also between the degree of orientation microestructural and the parameters of ductility.
It is presented an analysis of the behavior of the plastic level deformation macro and microestructural in steel 1.25Cr 0.5Mo exposed to working conditions of 480 oC for 20 years and submitted to heat treatment ( 700 oC, 1.5h ). The essays of creep with a womb that comprises temperatures between 525 and 600 oC and tensions between 100 and 175 MPa are applicable themselves. In order to evaluate the macrodeformation they analyze the curves of creep; while the microdeformation is studied on the basis of the degree of deformation microestructural itself. The reduction of the area for the aged material in use was between 71 and 88 %; which shortens 82 and 91 % for the effect of heat treatment itself. While for the lengthening the status belonged to 19 and 57 % and 46 and 61 % respectively. A linear behavior between the lengthening and the temperature is verified; and also between the degree of orientation microestructural and the parameters of ductility.
Descripción
Palabras clave
Microdeformación, Macrodeformación, Acero 1.25Cr0.5Mo, Fluencia Lenta, Análisis