Effect of shot peening on metastable austenitic stainless steels
In this work, shot peening was performed in a metastable austenitic stainless steel EN 1.4318 (AISI 301LN) in order to evaluate its effect on austenite to martensite phase transformation and also the influence on the fatigue limit. Two different steel conditions were considered: annealed, i.e., with...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/78469 |
| Acceso en línea: | https://hdl.handle.net/2117/78469 https://dx.doi.org/10.1016/j.msea.2015.05.079 |
| Access Level: | acceso abierto |
| Palabra clave: | Stainless steel Metastable austenitic stainless steels Shot peening Martensitic phase transformation Diffraction EBSD FIB CYCLE FATIGUE BEHAVIOR RESIDUAL-STRESS PEENED COMPONENTS ELASTIC-MODULUS DEFORMATION TEMPERATURE MICROSTRUCTURE INDENTATION PREDICTION STRENGTH Acer inoxidable Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | In this work, shot peening was performed in a metastable austenitic stainless steel EN 1.4318 (AISI 301LN) in order to evaluate its effect on austenite to martensite phase transformation and also the influence on the fatigue limit. Two different steel conditions were considered: annealed, i.e., with a fully austenitic microstructure, and cold rolled, consisting of a mixture of austenite and martensite. X-ray diffraction, electron back-scattered diffraction and focus ion beam, as well as nanoindentation techniques, were used to elucidate deformation mechanisms activated during shot peening and correlate with fatigue response. Results pointed out that extensive plastic deformation and phase transformation developed in annealed specimens as a consequence of shot peening. However, the increase of roughness and the generation of microcracks led to a limited fatigue limit improvement. In contrast, shot peened cold rolled specimens exhibited enhanced fatigue limit. In the latter case, the main factor that determined the influence on the fatigue response was the distance from the injector, followed successively by the exit speed of the shots and the coverage factor. (C) 2015 Elsevier B.V. All rights reserved. |
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