In situ X-ray quantification of melt pool behaviour during directed energy deposition additive manufacturing of stainless steel

DOI: 10.1016/j.matlet.2020.129205

Authors: Yunhui Chen (University College London; Research Complex at Harwell) , Samuel J. Clark (University College London; Research Complex at Harwell) , Yuze Huang (University College London; Research Complex at Harwell) , Lorna Sinclair (University College London; Research Complex at Harwell) , Chu Lun Alex Leung (University College London; Research Complex at Harwell) , Sebastian Marussi (University College London; Research Complex at Harwell) , Thomas Connolley (Diamond Light Source) , Oxana V. Magdysyuk (Diamond Light Source) , Robert C. Atwood (Diamond Light Source) , Gavin J. Baxter (Rolls-Royce plc) , Martyn A. Jones (Rolls-Royce plc) , Iain Todd (The University of Sheffield) , Peter D. Lee (University College London; Research Complex at Harwell)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Materials Letters

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 20096

Abstract: The Directed Energy Deposition Additive Manufacturing (DED-AM) of SS316L was studied using in situ and operando synchrotron X-ray imaging to quantitively understand the effect of processing parameters on the melt-pool morphology and surface quality. It was found that surface roughness of DED-AM builds can result from melt pool surface perturbations caused by changes in the melt flow and build stage motion perturbations. Process maps are developed that quantitatively correlate build quality to process parameters including powder feed rate, laser power and traverse speed. How the AM process parameters control build efficacy is clarified, and the processing conditions required to dampen surface perturbations leading to roughness were determined.

Journal Keywords: Directed Energy Deposition; in situ Synchrotron X-ray imaging; Laser Additive Manufacturing

Diamond Keywords: Additive Manufacturing; Alloys

Subject Areas: Materials, Engineering


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Documents:
1-s2.0-S0167577X20319121-main.pdf

Discipline Tags:

Engineering & Technology Material Sciences Metallurgy

Technical Tags:

Imaging