- Oct 2019
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a novel method for the evaluation of the surface fatigue strength of a stainless-steel component is proposed. The use of stainless steel is necessary indeed, whenever a component has to work in a particularly aggressive environment that may cause an oxidation of the component itself. One of the major problems that affect stainless-steel components is the possible wear of the antioxidant film that reduces the antioxidant properties of the component itself. One of the main causes that can lead to wear is related to the surface corrosion that occurs every time two evolving bodies are forced to work against each other. If the antioxidant film is affected by surface fatigue problems, such as pitting or spalling, the antioxidant capacities of this type of steel may be lost. In this context, it is, therefore, necessary to verify, at least, by calculation that no corrosion problems exist. The method proposed in this activity is a hybrid method, numerical-theoretical, which allows to estimate the surface fatigue strength in a very short time without having to resort to finite element models that often are so complex to be in contrast with industrial purposes.
En resumen, se propone un método novedoso para la evaluación de la resistencia a la fatiga superficial de un componente de acero inoxidable. Uno de los principales problemas que afectan los componentes de acero inoxidable es el posible desgaste de la película antioxidante que reduce las propiedades antioxidantes del componente en sí. Una de las causas principales que pueden conducir al desgaste está relacionada con la corrosión de la superficie que ocurre cada vez que dos cuerpos en evolución se ven obligados a trabajar uno contra el otro. Si la película antioxidante se ve afectada por problemas de fatiga superficial, como picaduras o desprendimientos, las capacidades antioxidantes de este tipo de acero pueden perderse.
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On the Evaluation of Surface Fatigue Strength of a Stainless-Steel Aeronautical Component
"Evaluación de la resistencia a la fatiga superficial de un componente aeronáutico de acero inoxidable"
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The Role of Hydrogen in Hydrogen Embrittlement of Metals: The Case of Stainless Steel
"El papel del hidrógeno en la fragilización por hidrógeno de metales: el caso del acero inoxidable"
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the effects of the deformation temperature, the deformation reduction and the deformation rate on the microstructural formation, ferritic and martensitic phase transformation, stress–strain behaviors and micro-hardness in low-carbon ferritic stainless steel were investigated. The increase in deformation temperature promotes the formation of the fine equiaxed dynamic strain-induced transformation ferrite and suppresses the martensitic transformation. The higher deformation temperature results in a lower starting temperature for martensitic transformation. The increase in deformation can effectively promote the transformation of DSIT ferrite, and decrease the martensitic transformation rate, which is caused by the work hardening effect on the metastable austenite. The increase in the deformation rate leads to an increase in the ferrite fraction, because a high density of dislocation remains that can provide sufficient nucleation sites for ferrite transformation. The slow deformation rate results in dynamic recovery according to the stress–strain curve.
En resumen, se estudiaron diferentes comportamientos del acero inoxidable ferrítico con bajo contenido de carbono en distintos tipos de condiciones. Los aceros inoxidables ferríticos son aquellos que contienen hasta 30% de Cr y menos de 0.12% de C. Tienen buena resistencia y moderada ductilidad.
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Microstructure Formation of Low-Carbon Ferritic Stainless Steel during High Temperature Plastic Deformation
"Formación de microestructura de acero inoxidable ferrítico bajo en carbono durante la deformación plástica a alta temperatura"
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