Efecto del tratamiento térmico post soldadura sobre la microestructura del acero inoxidable grado ca6nm para la construcción de rodetes hidráulicos
Abstract
En los tratamientos térmicos de revenido para aceros inoxidables martensíticos grado CA6NM se busca obtener martensita revenida con un porcentaje de austenita retenida de hasta un 20% para conseguir las propiedades mecánicas y tribológicas del material que lo hacen adecuado para la fabricación de dispositivos hidráulicos. Sin embargo, éstos presentan un desgaste considerable durante su servicio, razón por la cual es necesario repararlos por medio de soldadura y someterlos a tratamientos térmicos posteriores para obtener propiedades similares a las del material original. En este trabajo se muestra el efecto de tratamientos térmicos post soldadura sobre el acero y una caracterización de la microestructura de la ZAT antes y después de los tratamientos. Los ensayos fueron realizados en probetas BOP a temperaturas de 600 ºC y 620 ºC con sostenimientos de 20, 40 y 60 minutos, sometidas a pruebas de microdureza y análisis metalográfico.Downloads
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