Estimación del umbral en condiciones de fragilización por hidrógeno mediante la aplicación del método de los escalones al ensayo Small Punch
ABSTRACT: In recent works the Small Punch Test (SPT) has been used to estimate the mechanical properties of steels in aggressive environments, where characterizations by means of constant loading tests are slow, and sometimes presents a considerable dispersion in the results. The standard ASTM F1624...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad de Cantabria (UC) |
| Repositorio: | UCrea Repositorio Abierto de la Universidad de Cantabria |
| Idioma: | español |
| OAI Identifier: | oai:repositorio.unican.es:10902/24415 |
| Acceso en línea: | http://hdl.handle.net/10902/24415 |
| Access Level: | acceso abierto |
| Palabra clave: | Small Punch Técnica de carga por escalones ASTM F1624 Tensión umbral Fragilización por hidrógeno. Step loading technique Threshold stress Hydrogen embrittlement |
| Sumario: | ABSTRACT: In recent works the Small Punch Test (SPT) has been used to estimate the mechanical properties of steels in aggressive environments, where characterizations by means of constant loading tests are slow, and sometimes presents a considerable dispersion in the results. The standard ASTM F1624 solves this, by applying constant loads gradually increased, called loading steps, until the sample fails. In the present work, it is proposed to apply the incremental step loading technique from ASTM F1624 adapted to SPT. Modifications on the steps durations are proposed according with the sample thickness, allowing to obtain the threshold stress in aggressive environments within a few days, by using at least 3 samples. The proposed methodology is applied to a set of two steels, of medium and high-strength, in hydrogen embrittlement environments under three different levels of cathodic polarization in an acid electrolyte. As a reference, cylindrical tensile specimens were subjected to conventional standard tests in accordance with ASTM F1624. The correlation between the threshold stresses, obtained according to ASTM F1624, and the threshold loads, obtained by the Small Punch proposal, is presented and analysed. Finally, from the aforementioned correlation, a threshold stress estimation based just on Small Punch tests is proposed. |
|---|