This thesis work is focused on Nickel and its alloys, in particular on Inconel alloy 625 and two components made up with this material that have been object of complete failure analysis. The first chapter is about an introduction into Nickel world, it is recalled the main properties, applications and advantages of using this material and its alloys. It is also presented the main elements of Nickel metallurgy. The second chapter is focused on Inconel 625 alloy: from a quite general overview of this material, we go through a deepen study on solidification behaviors and solidification phases. In chapter 3 it is presented the first case study of a component (bushings) made up with Inconel 625 that undergo failure analysis. All passages of failure analysis are here showed and described, often tagged along with images, which are the most important tool in failure analysis. In chapter 4 it is presented the second and last case study of failure analysis. The procedure that has been followed is the same of the previous case; also, in this case the focus is on the images that give the most important information in failure analysis. The approach of this thesis changes from chapter 1 and 2 to chapter 3 and 4. The first 2 chapters are mainly theoretical and are necessary to master the basis in Nickel and Inconel 625 field, while the last 2 chapters are more practical, no theory is recalled, and it is described the procedure of failure analysis and attempts to improve the response of the material, with explanations and comments.
Questa tesi è incentrata sul Nickel e le sue leghe, in particolare la lega Inconel 625 e due componenti realizzati con questo materiale che sono stati oggetto del processo di Failure Analysis. Il primo capitolo è una introduzione al mondo metallurgico del Nickel, sono infatti richiamate le principali proprietà, applicazioni e vantaggi nell'utilizzo di questo materiale e delle sue leghe. Sono inoltre presentati i principali elementi della metallurgia del Nickel. Il secondo capitolo è focalizzato sull'Inconel 625: da una generale e semplice presentazione di questo materiale, si passa ad un approfondito studio del comportamento durante la fase di solidificazione e le diverse fasi di solidificazione. Nel terzo capitolo è presentato il primo caso di Failure analysis di un componente (bussole) realizzato in Inconel 625. Tutti i passaggi del processo di Failure analysis sono qui presentati, solitamente accompagnati da immagini, che sono lo strumento più importante durante la Failure analysis. Nel quarto capitolo è presentato il secondo ed ultimo caso di Failure analysis. La procedura che è stata seguita è la stessa del precedente caso. L'approccio adottato in questa tesi cambia dai capitoli 1 e 2 ai capitolo 3 e 4. I primi due capitoli sono prettamente teorici e necessari a padroneggiare le basi nel campo della metallurgia del Nickel e della lega Inconel 625, mentre gli ultimi due capitoli sono di natura più pratica; non ci sono richiami teorici. E' descritta in dettaglio la procedura di Failure analysis ed i tentativi per migliorare la risposta in esercizio del materiale, con commenti e spiegazioni.
Failure Analysis of Inconel 625 components
ZAMBON, MATTIA
2022/2023
Abstract
This thesis work is focused on Nickel and its alloys, in particular on Inconel alloy 625 and two components made up with this material that have been object of complete failure analysis. The first chapter is about an introduction into Nickel world, it is recalled the main properties, applications and advantages of using this material and its alloys. It is also presented the main elements of Nickel metallurgy. The second chapter is focused on Inconel 625 alloy: from a quite general overview of this material, we go through a deepen study on solidification behaviors and solidification phases. In chapter 3 it is presented the first case study of a component (bushings) made up with Inconel 625 that undergo failure analysis. All passages of failure analysis are here showed and described, often tagged along with images, which are the most important tool in failure analysis. In chapter 4 it is presented the second and last case study of failure analysis. The procedure that has been followed is the same of the previous case; also, in this case the focus is on the images that give the most important information in failure analysis. The approach of this thesis changes from chapter 1 and 2 to chapter 3 and 4. The first 2 chapters are mainly theoretical and are necessary to master the basis in Nickel and Inconel 625 field, while the last 2 chapters are more practical, no theory is recalled, and it is described the procedure of failure analysis and attempts to improve the response of the material, with explanations and comments.File | Dimensione | Formato | |
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ZAMBON_MATTIA_THESIS.pdf
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https://hdl.handle.net/10589/207953