Publication: Recocido subcrítico de aceros de alta resistencia y estudio de su comportamiento frente al desgaste provocado por la combustión de explosivos
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2020-03-20
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Universidad Complutense de Madrid
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Abstract
El desarrollo de nuevos tratamientos térmicos con los que obtener las propiedades mecánicas apropiadas para los aceros y que a la vez resulten en un ciclo de vida más favorable para los productos es un camino para mejorar la sostenibilidad de la industria siderúrgica. Se investigaron distintos tratamientos alternativos de recocido a temperatura subcrítica para los aceros de baja aleación y alta resistencia 42CrMo4 y 30CrNiMo8. Estos se realizan en una etapa, a menores temperaturas y durante menos tiempo que los convencionales, sustituyendo además el temple en aceite típico para estos materiales por temple en agua. El desgaste provocado por la combustión de explosivos, cada vez más energéticos y agresivos con el acero de los cañones, es una variable que afecta negativamente al ciclo de vida del producto, concretamente en su etapa de uso. Para evaluar los mecanismos que rigen este desgaste se utilizó método estándar de la cámara de combustión ventilada complementado con el análisis de las partículas arrancadas por la explosión durante los experimentos. Con el objetivo de explicar y predecir el efecto térmico de la combustión de propelentes en la cámara ventilada, se realizó un modelo de transferencia de calor basado en el cálculo del coeficiente de transferencia de calor para distintas mezclas de gases de combustión...
The development of new heat treatments to obtain suitable mechanical properties with a friendlier life cycle is a way for the steel industry for the increase of its sustainability. Different subcritical annealing treatments were investigated for the high strength low alloy 42CrMo4 and 30CrNiMo8 steels. Those treatments were done in one step, with lower temperatures, during shorter periods of time and using water instead of oil as quenching medium. New generation ammunitions tend to be more erosive than the previous formulations. The wear caused by the combustion of propellants affects the life cycle of the gun barrels negatively. In order to evaluate the wear mechanisms, the standard method of the vented vessel was used, supplemented by metallographical analysis of the samples attached to the vessel and the eroded particles. In order to predict the thermal effect caused by the combustion of explosives in the vented vessel, a heat transfer model based on the calculation of the heat transfer coefficient was developed for different combustion gas mixtures...
The development of new heat treatments to obtain suitable mechanical properties with a friendlier life cycle is a way for the steel industry for the increase of its sustainability. Different subcritical annealing treatments were investigated for the high strength low alloy 42CrMo4 and 30CrNiMo8 steels. Those treatments were done in one step, with lower temperatures, during shorter periods of time and using water instead of oil as quenching medium. New generation ammunitions tend to be more erosive than the previous formulations. The wear caused by the combustion of propellants affects the life cycle of the gun barrels negatively. In order to evaluate the wear mechanisms, the standard method of the vented vessel was used, supplemented by metallographical analysis of the samples attached to the vessel and the eroded particles. In order to predict the thermal effect caused by the combustion of explosives in the vented vessel, a heat transfer model based on the calculation of the heat transfer coefficient was developed for different combustion gas mixtures...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Ingeniería Química y Materiales, leída el 28/11/2019