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A parametric neutron Bragg edge imaging study of additively manufactured samples treated by laser shock peening

Authors :
Matteo Busi
Nikola Kalentics
Manuel Morgano
Seth Griffiths
Anton S. Tremsin
Takenao Shinohara
Roland Logé
Christian Leinenbach
Markus Strobl
Source :
Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
Publication Year :
2021
Publisher :
Nature Portfolio, 2021.

Abstract

Abstract Laser powder bed fusion is an additive manufacturing technique extensively used for the production of metallic components. Despite this process has reached a status at which parts are produced with mechanical properties comparable to those from conventional production, it is still prone to introduce detrimental tensile residual stresses towards the surfaces along the building direction, implying negative consequences on fatigue life and resistance to crack formations. Laser shock peening (LSP) is a promising method adopted to compensate tensile residual stresses and to introduce beneficial compressive residual stress on the treated surfaces. Using neutron Bragg edge imaging, we perform a parametric study of LSP applied to 316L steel samples produced by laser powder bed fusion additive manufacturing. We include in the study the novel 3D-LSP technique, where samples are LSP treated also during the building process, at intermediate build layers. The LSP energy and spot overlap were set to either 1.0 or 1.5 J and 40 $$\%$$ % or 80 $$\%$$ % respectively. The results support the use of 3D-LSP treatment with the higher LSP laser energy and overlap applied, which showed a relative increase of surface compressive residual stress (CRS) and CRS depth by 54 $$\%$$ % and 104 $$\%$$ % respectively, compared to the conventional LSP treatment.

Subjects

Subjects :
Medicine
Science

Details

Language :
English
ISSN :
20452322
Volume :
11
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Scientific Reports
Publication Type :
Academic Journal
Accession number :
edsdoj.b7dcf93091c2422681d7d3c39a2d227e
Document Type :
article
Full Text :
https://doi.org/10.1038/s41598-021-94455-3