Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press

A machined material has a work-hardened layer at its surface. In this study, a surface modification technique, the scanning cyclic press (SCP), was applied to machined specimens of magnesium alloy, AZ31, to investigate whether SCP can improve its fatigue properties regardless of the surface finish....

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Autores principales:	Nao FUJIMURA, Koyo OOGA, Kosuke TAKAHASHI, Takashi NAKAMURA, Tatsuki WAJIMA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	surface modification scanning cyclic press magnesium alloy surface roughness improvement of fatigue property Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/d94002fa2c674b6bb35426fd8df2e52e
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spelling	oai:doaj.org-article:d94002fa2c674b6bb35426fd8df2e52e2021-11-29T05:59:26ZSurface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press2187-974510.1299/mej.20-00007https://doaj.org/article/d94002fa2c674b6bb35426fd8df2e52e2020-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_20-00007/_pdf/-char/enhttps://doaj.org/toc/2187-9745A machined material has a work-hardened layer at its surface. In this study, a surface modification technique, the scanning cyclic press (SCP), was applied to machined specimens of magnesium alloy, AZ31, to investigate whether SCP can improve its fatigue properties regardless of the surface finish. During the SCP process, a vibrating indenter reciprocally scanned the specimen’s surface, and it applied cyclical low-compressive loadings to the surface for 8 × 106 cycles. After applying SCP, the surfaces of the specimens were observed using a laser scanning microscope, and the surface roughness was measured. The surface observation and surface roughness measurement showed that the changes in the surface state after applying SCP were relatively small and the surface roughness after applying SCP was more homogenous than before applying SCP. Uniaxial push-pull fatigue tests were conducted for SCP-treated specimens and untreated specimens. The test results showed that the fatigue life of SCP-treated specimens was longer than that of untreated specimens. To clarify the reason for the improvement effect, the fracture surfaces were observed using a scanning electron microscope (SEM). The SEM observation showed that the fracture morphology was different between the SCP-treated specimen and the untreated specimen. In the SCP-treated specimen, fatigue fracture origins were sub-surface, while the untreated specimen fractured at the surface. These results suggest that SCP could improve the fatigue properties of AZ31 regardless of the surface finish of the specimen before SCP.Nao FUJIMURAKoyo OOGAKosuke TAKAHASHITakashi NAKAMURATatsuki WAJIMAThe Japan Society of Mechanical Engineersarticlesurface modificationscanning cyclic pressmagnesium alloysurface roughnessimprovement of fatigue propertyMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 20-00007-20-00007 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	surface modification scanning cyclic press magnesium alloy surface roughness improvement of fatigue property Mechanical engineering and machinery TJ1-1570
spellingShingle	surface modification scanning cyclic press magnesium alloy surface roughness improvement of fatigue property Mechanical engineering and machinery TJ1-1570 Nao FUJIMURA Koyo OOGA Kosuke TAKAHASHI Takashi NAKAMURA Tatsuki WAJIMA Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press
description	A machined material has a work-hardened layer at its surface. In this study, a surface modification technique, the scanning cyclic press (SCP), was applied to machined specimens of magnesium alloy, AZ31, to investigate whether SCP can improve its fatigue properties regardless of the surface finish. During the SCP process, a vibrating indenter reciprocally scanned the specimen’s surface, and it applied cyclical low-compressive loadings to the surface for 8 × 106 cycles. After applying SCP, the surfaces of the specimens were observed using a laser scanning microscope, and the surface roughness was measured. The surface observation and surface roughness measurement showed that the changes in the surface state after applying SCP were relatively small and the surface roughness after applying SCP was more homogenous than before applying SCP. Uniaxial push-pull fatigue tests were conducted for SCP-treated specimens and untreated specimens. The test results showed that the fatigue life of SCP-treated specimens was longer than that of untreated specimens. To clarify the reason for the improvement effect, the fracture surfaces were observed using a scanning electron microscope (SEM). The SEM observation showed that the fracture morphology was different between the SCP-treated specimen and the untreated specimen. In the SCP-treated specimen, fatigue fracture origins were sub-surface, while the untreated specimen fractured at the surface. These results suggest that SCP could improve the fatigue properties of AZ31 regardless of the surface finish of the specimen before SCP.
format	article
author	Nao FUJIMURA Koyo OOGA Kosuke TAKAHASHI Takashi NAKAMURA Tatsuki WAJIMA
author_facet	Nao FUJIMURA Koyo OOGA Kosuke TAKAHASHI Takashi NAKAMURA Tatsuki WAJIMA
author_sort	Nao FUJIMURA
title	Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press
title_short	Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press
title_full	Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press
title_fullStr	Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press
title_full_unstemmed	Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press
title_sort	surface modification of machine-finished magnesium alloy az31 using a scanning cyclic press
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/d94002fa2c674b6bb35426fd8df2e52e
work_keys_str_mv	AT naofujimura surfacemodificationofmachinefinishedmagnesiumalloyaz31usingascanningcyclicpress AT koyoooga surfacemodificationofmachinefinishedmagnesiumalloyaz31usingascanningcyclicpress AT kosuketakahashi surfacemodificationofmachinefinishedmagnesiumalloyaz31usingascanningcyclicpress AT takashinakamura surfacemodificationofmachinefinishedmagnesiumalloyaz31usingascanningcyclicpress AT tatsukiwajima surfacemodificationofmachinefinishedmagnesiumalloyaz31usingascanningcyclicpress
_version_	1718407615137972224

Surface modification of machine-finished magnesium alloy AZ31 using a scanning cyclic press

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