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Geometrical effects on residual stress in selective laser melting

Parry, L.A.; Ashcroft, I.A.; Wildman, R.D.

Authors

L.A. Parry

IAN ASHCROFT Ian.Ashcroft@nottingham.ac.uk
Professorof Mechanics of Solids

RICKY WILDMAN Ricky.Wildman@nottingham.ac.uk
Professor of Multiphase Flow and Mechanics



Abstract

Selective laser melting is an increasingly attractive technology for the manufacture of complex and low volume / high value metal parts. However, the inevitable residual stresses that are generated can lead to defects or build failure. Due to the complexity of this process, efficient and accurate prediction of residual stress in large components remains challenging. For the development of predictive models of residual stress, knowledge on their generation is needed. This study investigates the geometrical effect of scan strategy on residual stress development. It was found that the arrangement of scan vectors due to geometry, heavily influenced the thermal history within a part, which in turn significantly affected the transverse residual stresses generated. However, irrespective of the choice of scanned geometry and the thermal history, the higher magnitude longitudinal stresses had consistent behaviour based on the scan vector length. It was shown that the laser scan strategy becomes less important for scan vector length beyond 3 mm. Together, these findings, provide a route towards optimising scan strategies at the meso-scale, and additionally, developing a model abstraction for predicting residual stress based on scan vectors alone.

Journal Article Type Article
Publication Date 2019-01
Journal Additive Manufacturing
Print ISSN 2214-7810
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 25
Pages 166-175
APA6 Citation Parry, L., Ashcroft, I., & Wildman, R. (2019). Geometrical effects on residual stress in selective laser melting. Additive Manufacturing, 25, 166-175. https://doi.org/10.1016/j.addma.2018.09.026
DOI https://doi.org/10.1016/j.addma.2018.09.026
Keywords Selective laser melting; Residual stress; simulation; laser scan strategy
Publisher URL https://www.sciencedirect.com/science/article/pii/S2214860418304202

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