Determination of the effect of scan strategy on residual stress in laser powder bed fusion additive manufacturing

Robinson, J, Ashton, I ORCID: 0000-0002-0449-2415, Fox, P ORCID: 0000-0003-3442-8630, Jones, E and Sutcliffe, C
(2018) Determination of the effect of scan strategy on residual stress in laser powder bed fusion additive manufacturing. ADDITIVE MANUFACTURING, 23. pp. 13-24.

[thumbnail of Residual_Stress_Paper_Rev4.4.docx] Text
Residual_Stress_Paper_Rev4.4.docx - Author Accepted Manuscript

Download (3MB)


Any literature investigation of Laser Powder Bed Fusion (L-PBF) manufacturing of metal parts would reveal that the development of internal stresses is a serious limitation in the application of this technology. Researchers have used a variety of different methods to quantify this stress and investigate scanning strategies aimed at reducing or distributing this stress more evenly in the part. The most common methods used to assess the levels of stress in parts are deflection based. These techniques provide a rapid method to give a quantitative comparison of scan strategies and parameters. Although studies have calculated the levels of stress relieved by the measured deflection, these studies often neglect the stresses that remain in the part after release. This study shows that these stresses can still be considerable. Non-destructive diffraction based methods can be used to calculate the profile of stress in a part but these are often prohibitively expensive or difficult to use on a large scale. This study presents a methodology which combines deflection based methods with either the hole drilling or contour methods. Results show that these experiments can be completed in a cost effective manner, with standard lab based equipment to generate a through thickness measurement of residual stress.

Item Type: Article
Uncontrolled Keywords: Additive manufacturing, Laser powder bed fusion, Selective laser melting, Residual stress, Post-process measurement
Depositing User: Symplectic Admin
Date Deposited: 02 Aug 2018 10:17
Last Modified: 19 Jan 2023 01:29
DOI: 10.1016/j.addma.2018.07.001
Related URLs: