Introducing gradient severe shot peening as a novel mechanical surface treatment

Abstract Shot peening is widely used for improving mechanical properties especially fatigue behavior of metallic components by inducing surface hardening, compressive residual stresses and surface grain refinement. In air blast shot peening, projection pressure and surface coverage (an index of peen...

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Autores principales:	Erfan Maleki, Sara Bagherifard, Okan Unal, Michele Bandini, Gholam Hossein Farrahi, Mario Guagliano
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6510298ea0844af39bfd70341d7c7407
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spelling	oai:doaj.org-article:6510298ea0844af39bfd70341d7c74072021-11-14T12:20:06ZIntroducing gradient severe shot peening as a novel mechanical surface treatment10.1038/s41598-021-01152-22045-2322https://doaj.org/article/6510298ea0844af39bfd70341d7c74072021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01152-2https://doaj.org/toc/2045-2322Abstract Shot peening is widely used for improving mechanical properties especially fatigue behavior of metallic components by inducing surface hardening, compressive residual stresses and surface grain refinement. In air blast shot peening, projection pressure and surface coverage (an index of peening duration) have been considered as major controlling process parameters; the combination of these parameters plays a critical role in the beneficial effects of shot peening. Generally in severe shot peening aimed at obtaining surface grain refinement, constant values of pressure are considered with different peening durations. Considering very high peening duration, however, the phenomenon of over shot peening, which can be identified with the formation of surface defects could occur. The present study introduces a novel shot peening treatment, here called gradient severe shot peening (GSSP) that instead of using constant projection pressure, implements gradually increasing or decreasing pressures. The gradual increase of the projection pressure acts as a pre-hardening stage for the following higher projection pressure boosting the potential of the material to tolerate the sequential impacts and thus become less prone to the formation of surface defects. The results of the experiments indicate significant fatigue life improvement obtained for GSSP treated specimens compared to the standard treatment with constant pressure. GSSP avoids the detrimental effects of over-peening, while maintaining the beneficial effects of surface nano-crystallization, surface hardening and compressive residual stresses. The notable difference in fatigue strength enhancement for GSSP treated material can be also attributed to the modulated surface morphology with lower surface roughness compared to a standard shot peening treatment with the same exposure time.Erfan MalekiSara BagherifardOkan UnalMichele BandiniGholam Hossein FarrahiMario GuaglianoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Erfan Maleki Sara Bagherifard Okan Unal Michele Bandini Gholam Hossein Farrahi Mario Guagliano Introducing gradient severe shot peening as a novel mechanical surface treatment
description	Abstract Shot peening is widely used for improving mechanical properties especially fatigue behavior of metallic components by inducing surface hardening, compressive residual stresses and surface grain refinement. In air blast shot peening, projection pressure and surface coverage (an index of peening duration) have been considered as major controlling process parameters; the combination of these parameters plays a critical role in the beneficial effects of shot peening. Generally in severe shot peening aimed at obtaining surface grain refinement, constant values of pressure are considered with different peening durations. Considering very high peening duration, however, the phenomenon of over shot peening, which can be identified with the formation of surface defects could occur. The present study introduces a novel shot peening treatment, here called gradient severe shot peening (GSSP) that instead of using constant projection pressure, implements gradually increasing or decreasing pressures. The gradual increase of the projection pressure acts as a pre-hardening stage for the following higher projection pressure boosting the potential of the material to tolerate the sequential impacts and thus become less prone to the formation of surface defects. The results of the experiments indicate significant fatigue life improvement obtained for GSSP treated specimens compared to the standard treatment with constant pressure. GSSP avoids the detrimental effects of over-peening, while maintaining the beneficial effects of surface nano-crystallization, surface hardening and compressive residual stresses. The notable difference in fatigue strength enhancement for GSSP treated material can be also attributed to the modulated surface morphology with lower surface roughness compared to a standard shot peening treatment with the same exposure time.
format	article
author	Erfan Maleki Sara Bagherifard Okan Unal Michele Bandini Gholam Hossein Farrahi Mario Guagliano
author_facet	Erfan Maleki Sara Bagherifard Okan Unal Michele Bandini Gholam Hossein Farrahi Mario Guagliano
author_sort	Erfan Maleki
title	Introducing gradient severe shot peening as a novel mechanical surface treatment
title_short	Introducing gradient severe shot peening as a novel mechanical surface treatment
title_full	Introducing gradient severe shot peening as a novel mechanical surface treatment
title_fullStr	Introducing gradient severe shot peening as a novel mechanical surface treatment
title_full_unstemmed	Introducing gradient severe shot peening as a novel mechanical surface treatment
title_sort	introducing gradient severe shot peening as a novel mechanical surface treatment
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6510298ea0844af39bfd70341d7c7407
work_keys_str_mv	AT erfanmaleki introducinggradientsevereshotpeeningasanovelmechanicalsurfacetreatment AT sarabagherifard introducinggradientsevereshotpeeningasanovelmechanicalsurfacetreatment AT okanunal introducinggradientsevereshotpeeningasanovelmechanicalsurfacetreatment AT michelebandini introducinggradientsevereshotpeeningasanovelmechanicalsurfacetreatment AT gholamhosseinfarrahi introducinggradientsevereshotpeeningasanovelmechanicalsurfacetreatment AT marioguagliano introducinggradientsevereshotpeeningasanovelmechanicalsurfacetreatment
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Introducing gradient severe shot peening as a novel mechanical surface treatment

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