Skip to main content

Research Repository

Advanced Search

Understanding the effect of laser scan strategy on residual stress in selective laser melting through thermo-mechanical simulation

Parry, L.; Ashcroft, Ian; Wildman, Ricky D.

Understanding the effect of laser scan strategy on residual stress in selective laser melting through thermo-mechanical simulation Thumbnail


Authors

L. Parry

IAN ASHCROFT IAN.ASHCROFT@NOTTINGHAM.AC.UK
Professor of Mechanics of Solids

Ricky D. Wildman



Abstract

Selective laser melting (SLM) is an attractive technology, enabling the manufacture of customised, complex metallic designs, with minimal wastage. However, uptake by industry is currently impeded by several technical barriers, such as the control of residual stress, which have a detrimental effect on the manufacturability and integrity of a component. Indirectly, these impose severe design restrictions and reduce the reliability of components, driving up costs. This paper uses a thermo-mechanical model to better understand the effect of laser scan strategy on the generation of residual stress in SLM. A complex interaction between transient thermal history and the build-up of residual stress has been observed in the two laser scan strategies investigated. The temperature gradient mechanism was discovered for the creation of residual stress. The greatest stress component was found to develop parallel to the scan vectors, creating an anisotropic stress distribution in the part. The stress distribution varied between laser scan strategies and the cause has been determined by observing the thermal history during scanning. Using this, proposals are suggested for designing laser scan strategies used in SLM.

Citation

Parry, L., Ashcroft, I., & Wildman, R. D. (2016). Understanding the effect of laser scan strategy on residual stress in selective laser melting through thermo-mechanical simulation. Additive Manufacturing, 12(A), https://doi.org/10.1016/j.addma.2016.05.014

Journal Article Type Article
Acceptance Date May 9, 2016
Online Publication Date May 18, 2016
Publication Date Oct 1, 2016
Deposit Date Mar 15, 2017
Publicly Available Date Mar 28, 2024
Journal Additive Manufacturing
Print ISSN 2214-8604
Electronic ISSN 2214-8604
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 12
Issue A
DOI https://doi.org/10.1016/j.addma.2016.05.014
Keywords Selective laser melting; SLM; Residual stress; Simulation; Additive manufacturing
Public URL https://nottingham-repository.worktribe.com/output/974805
Publisher URL http://www.sciencedirect.com/science/article/pii/S2214860416300987

Files





You might also like



Downloadable Citations