Effects of Ti6al4v Powder Oxidation on Process Dynamics in Laser Powder Bed Fusion Additive Manufacturing

作     者：Soundarapandiyan, Gowtham Leung, Chu Lun Alex Johnston, Carol Bhatt, Alisha Khan, Raja H.U. McNutt, Phil Atwood, Robert C. Lee, Peter D. Chen, Bo Fitzpatrick, Michael E. 

作者机构： Granta Park CambridgeCB21 6AL United Kingdom TWI Ltd Granta Park CambridgeCB21 6AL United Kingdom Faculty of Engineering Environment and Computing Coventry University CoventryCV1 5FB United Kingdom Department of Mechanical Engineering University College London WC1E 7JE United Kingdom Research Complex at Harwell Rutherford Appleton Laboratory Harwell Didcot OX11 0FA United Kingdom School of Engineering University of Leicester LeicesterLE1 7RH United Kingdom Diamond Light Source Ltd Harwell Science & Innovation Campus Oxfordshire OX11 0DE United Kingdom  Villigen 5232 Switzerland 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Process monitoring 

摘      要：Recycling of unused powder for laser powder bed fusion (L-PBF) additive manufacturing is vital for its manufacturing sustainability. It is widely reported that the powder oxidation occurs during manufacturing and the oxygen levels of recycled Ti6Al4V powder continues to increase with increasing number of powder reuse. However, the impact of powder oxidation during laser-matter interaction, such as the melt pool dynamics, spatter, surface roughness and defects during L-PBF are not well understood. This study investigates the influence of Ti6Al4V powder with low (0.12 wt.%) and high-oxygen-content (0.40 wt.%) during multilayer thin-wall L-PBF part manufacturing using in situ synchrotron high speed X-ray imaging. The results indicated that the high-O-content powder particles had a positive effect in reducing melt ejections, surface roughness, and defect population in the built parts. The part produced from the high-O-content powder displayed higher microhardness possibly due to the solid solution strengthening mechanism and no obvious difference in the microstructure was observed. © 2022, The Authors. All rights reserved.