Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718

Inconel 718 is a Ni-based superalloy, which shows excellent mechanical properties such as tensile strength, fatigue strength, and creep strength at high temperatures up to 700 ℃. However, as Inconel 718 is a difficult-to-cut material, it causes severe wear of machining tools. Fabricating Inconel 718...

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Autores principales:	Manatsu OGAWAHARA, Shinya SASAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	additive manufacturing(am) selective laser melting(slm) inconel 718 fatigue internal defect Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/dc9958aee4d943a498cf1d508b0201c4
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spelling	oai:doaj.org-article:dc9958aee4d943a498cf1d508b0201c42021-11-29T06:04:29ZRelationship between internal defect size and fatigue limit in selective laser melted Inconel 7182187-974510.1299/mej.20-00362https://doaj.org/article/dc9958aee4d943a498cf1d508b0201c42020-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/1/8_20-00362/_pdf/-char/enhttps://doaj.org/toc/2187-9745Inconel 718 is a Ni-based superalloy, which shows excellent mechanical properties such as tensile strength, fatigue strength, and creep strength at high temperatures up to 700 ℃. However, as Inconel 718 is a difficult-to-cut material, it causes severe wear of machining tools. Fabricating Inconel 718 by Selective laser melting (SLM), a type of additive manufacturing (AM), is therefore expected as the manufacturing method to deal with this problem. However, it is impossible to completely prevent the occurrence of the internal defects in SLM parts. These internal defects deteriorate the mechanical properties such as the fatigue strength of SLM parts. Though the effect of the internal defect size on the fatigue limit of SLM alloys such as Ti6Al4V and AlSi10Mg has been extensively investigated, its effect on SLM Inconel 718 has not yet been investigated. In this study, Inconel 718 specimens with various internal defect sizes were fabricated by SLM and the effect of the internal defect size on their fatigue strength was investigated. Internal defect size distribution in as built specimen can be approximated by Gumbel distribution. The specimens containing internal defects with a diameter of about 400 μm showed no significant decrease in the fatigue strength. In the case of the plane specimen, the fatigue limit predicted using the statistic of extremes and the √area parameter model was 40% higher than that obtained experimentally.Manatsu OGAWAHARAShinya SASAKIThe Japan Society of Mechanical Engineersarticleadditive manufacturing(am)selective laser melting(slm)inconel 718fatigueinternal defectMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 1, Pp 20-00362-20-00362 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	additive manufacturing(am) selective laser melting(slm) inconel 718 fatigue internal defect Mechanical engineering and machinery TJ1-1570
spellingShingle	additive manufacturing(am) selective laser melting(slm) inconel 718 fatigue internal defect Mechanical engineering and machinery TJ1-1570 Manatsu OGAWAHARA Shinya SASAKI Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718
description	Inconel 718 is a Ni-based superalloy, which shows excellent mechanical properties such as tensile strength, fatigue strength, and creep strength at high temperatures up to 700 ℃. However, as Inconel 718 is a difficult-to-cut material, it causes severe wear of machining tools. Fabricating Inconel 718 by Selective laser melting (SLM), a type of additive manufacturing (AM), is therefore expected as the manufacturing method to deal with this problem. However, it is impossible to completely prevent the occurrence of the internal defects in SLM parts. These internal defects deteriorate the mechanical properties such as the fatigue strength of SLM parts. Though the effect of the internal defect size on the fatigue limit of SLM alloys such as Ti6Al4V and AlSi10Mg has been extensively investigated, its effect on SLM Inconel 718 has not yet been investigated. In this study, Inconel 718 specimens with various internal defect sizes were fabricated by SLM and the effect of the internal defect size on their fatigue strength was investigated. Internal defect size distribution in as built specimen can be approximated by Gumbel distribution. The specimens containing internal defects with a diameter of about 400 μm showed no significant decrease in the fatigue strength. In the case of the plane specimen, the fatigue limit predicted using the statistic of extremes and the √area parameter model was 40% higher than that obtained experimentally.
format	article
author	Manatsu OGAWAHARA Shinya SASAKI
author_facet	Manatsu OGAWAHARA Shinya SASAKI
author_sort	Manatsu OGAWAHARA
title	Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718
title_short	Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718
title_full	Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718
title_fullStr	Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718
title_full_unstemmed	Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718
title_sort	relationship between internal defect size and fatigue limit in selective laser melted inconel 718
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/dc9958aee4d943a498cf1d508b0201c4
work_keys_str_mv	AT manatsuogawahara relationshipbetweeninternaldefectsizeandfatiguelimitinselectivelasermeltedinconel718 AT shinyasasaki relationshipbetweeninternaldefectsizeandfatiguelimitinselectivelasermeltedinconel718
_version_	1718407615923355648

Relationship between internal defect size and fatigue limit in selective laser melted Inconel 718

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