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Valldeperez_Tomas_Edgar.pdf (3.17 MB)

Tipus de document

Treball de fi de grau

Data de publicació

2025-06

Llicència de publicació

cc-by-nc-nd (c) Valldepérez, 2025
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/228051

Characterization of super duplex stainless steels subjected to severe plastic deformation

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The objective of this study was to evaluate the effect of High Pressure Sliding (HPS) processing on the microstructure and mechanical properties of UNS S32750 super duplex stainless steel. For this purpose, 4 GPa of pressure was applied at room temperature in a single pass, sliding the samples 5 mm (X5), 10 mm (X10) and 15 mm (X15). Microstructure was analysed by light and electron microscopy (SEM), while grain refinement and crystallographic textures were determined by EBSD and X-ray diffraction. Mechanical properties were measured by Vickers microhardness and uniaxial tensile tests. The results show that HPS retains the ferritic-δ and austenitic-γ phases without forming secondary precipitates, while reducing the grain size significantly (from 9.6μm in the starting material to 4-5μm in X5/X10). This refinement is reflected in an increase in hardness from 250HV to almost 500HV in X15, and an increase in ultimate strength from 1300MPa for X15 to 2000MPa for X15, where ductile fracture was observed. In conclusion, HPS can induce homogeneous ultra-fine refinement and develop favourable textures in UNS S32750, leading to improvements of up to 100% in hardness and 70% in tensile strength without compromising toughness and two-phase integrity. These findings underline the industrial potential of HPS to produce super duplex components with high strength and excellent corrosion performance

Descripció

Treballs Finals de Grau d'Enginyeria de Materials, Facultat de Química, Universitat de Barcelona, Any: 2025, Núria Llorca Isern

Matèries

Acer inoxidable, Propietats mecàniques, Treballs de fi de grau

Matèries (anglès)

Stainless steel, Mechanical properties, Bachelor's theses

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Col·leccions

Treballs Finals de Grau (TFG) - Enginyeria de Materials

Citació

VALLDEPÉREZ TOMÀS, Edgar. Characterization of super duplex stainless steels subjected to severe plastic deformation. [consulted: 3 of August of 2026]. Available at: https://hdl.handle.net/2445/228051

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