Diamond Publications - Search Results

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

One item found (0 items not approved).

Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	Sinter formation during directed energy deposition of titanium alloy powders Lorna Sinclair , Yunhui Chen , Samuel J. Clark , Sebastian Marussi , Saurabh Shah , Oxana Magdysyuk , Robert Atwood , Gavin J. Baxter , Martyn Jones , Graham Mccartney , Chu Lun Alex Leung , Peter D. Lee International Journal Of Machine Tools And Manufacture 8 DOI: 10.1016/j.ijmachtools.2022.103887 Diamond Proposal Number(s): [20096] Open Access Show Abstract ▼ Abstract: During directed energy deposition (DED) additive manufacturing, powder agglomeration and sintering can occur outside of the melt pool when using titanium alloy powders. Using in situ synchrotron radiography we investigate the mechanisms by which sintering of Ti6242 powder occurs around the pool, performing a parametric study to determine the influence of laser power and stage traverse speed on sinter build-up. The results reveal that detrimental sinter can be reduced using a high laser power or increased stage traverse speed, although the latter also reduces deposition layer thickness. The mechanism of sinter formation during DED was determined to be in-flight heating of the powder particles in the laser beam. Calculations of particle heating under the processing conditions explored in this study confirm that powder particles can reasonably exceed 700 °C, the threshold for Ti surface oxide dissolution, and thus the powder is prone to sintering if not incorporated into the melt pool. The build-up of sinter powder layer on deposit surfaces led to lack of fusion pores. To mitigate sinter formation and its detrimental effects on DED component quality, it is essential that the powder delivery spot area is smaller than the melt pool, ensuring most powder lands in the melt pool.	Apr 2022

Instruments / Technical Area

Publication Details

Published

Actions

I12-JEEP: Joint Engineering, Environmental and Processing

Sinter formation during directed energy deposition of titanium alloy powders