A residual heat compensation based scan strategy for powder bed fusion additive manufacturing

Published

July 31, 2020

Author(s)

Ho Yeung, Brandon M. Lane

Abstract

Typical scan strategies for laser powder bed fusion (LPBF) additive manufacturing systems apply a constant laser power and scan speed while scanning the laser back and forth in a 'hatch' pattern to cover geometric areas on each powder layer. Localized preheating from adjacent scan paths and heat accumulation in corners or narrow geometries result in inconsistent melt-pool morphology and temperature history within a layer. A new control approach is proposed which compensates the residual heat through laser power adjustment. A model called residual heat factor (RHF) is developed based on temporal and spatial history of the scan to 'quantify' the residual heat effect, and laser power is controlled proportional to this RHF. Experiments are conducted on a custom-controlled LPBF testbed on Nickel-alloy (IN625) bare plate, and the effects of this unique scan strategy are investigated by in-situ melt-pool monitoring in combination with post-process part quality measurements.

Citation

Manufacturing Letters

Volume

25

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.mfglet.2020.07.005

Local Download

Keywords

Feedforward control, in-situ melt-pool monitoring, continuous laser power variation

Citation

Yeung, H. and Lane, B. (2020), A residual heat compensation based scan strategy for powder bed fusion additive manufacturing, Manufacturing Letters, [online], https://doi.org/10.1016/j.mfglet.2020.07.005 (Accessed October 9, 2025)