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On the Influence of Ultrasonic Surface Mechanical Attrition Treatment (SMAT) on the Fatigue Behavior of the 304L Austenitic Stainless Steel

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Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux, Université de Lorraine, CNRS UMR 7239, 7 rue Félix Savart, 57073 Metz, France
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LABoratoire d’EXcellence Design des Alliages Métalliques pour Allègement de Structures, Université de Lorraine, 7 rue Félix Savart, 57073 Metz, France
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Institut Pprime, CNRS-ENSMA, Université de Poitiers, UPR CNRS 3346, Physics and Mechanics of Materials Department, ENSMA, Téléport 2, 1 Avenue Clément Ader, BP 40109, 86961 Futuroscope Chasseneuil CEDEX, France
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Ecole de Technologie Supérieure de Montréal, 1100 Rue Notre-Dame Ouest, Montréal, QC H3C 1K3, Canada
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Author to whom correspondence should be addressed.
Metals 2020, 10(1), 100; https://doi.org/10.3390/met10010100
Received: 25 November 2019 / Revised: 27 December 2019 / Accepted: 1 January 2020 / Published: 8 January 2020
The potential of ultrasonic surface mechanical attrition treatment (SMAT) at different temperatures (including cryogenic) for improving the fatigue performance of 304L austenitic stainless steel is evaluated along with the effect of the fatigue loading conditions. Processing parameters such as the vibration amplitude, the size, and the material of the shot medias were fixed. Treatments of 20 min at room temperature and cryogenic temperature were compared to the untreated material by performing rotating–bending fatigue tests at 10 Hz. The fatigue limit was increased by approximately 30% for both peening temperatures. Meanwhile, samples treated for 60 min at room temperature were compared to the initial state in uniaxial fatigue tests performed at R = −1 (fully reversed tension–compression) at 10 Hz, and the fatigue limit enhancement was approximately 20%. In addition, the temperature measurements done during the tests revealed a negligible self-heating (∆t < 50 °C) of the run-out specimens, whereas, at high stress amplitudes, temperature changes as high as 300 °C were measured. SMAT was able to increase the stress range for which no significant local self-heating was reported on the surface. View Full-Text
Keywords: surface mechanical attrition treatment (SMAT); ultrasonic shot peening (USP); cryogenic temperature; 304L austenitic stainless steel; rotating–bending fatigue; tension–compression fatigue surface mechanical attrition treatment (SMAT); ultrasonic shot peening (USP); cryogenic temperature; 304L austenitic stainless steel; rotating–bending fatigue; tension–compression fatigue
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MDPI and ACS Style

Dureau, C.; Novelli, M.; Arzaghi, M.; Massion, R.; Bocher, P.; Nadot, Y.; Grosdidier, T. On the Influence of Ultrasonic Surface Mechanical Attrition Treatment (SMAT) on the Fatigue Behavior of the 304L Austenitic Stainless Steel. Metals 2020, 10, 100.

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