Metal FFF sintering shrinkage rate measurements by X-ray computed tomography

• DOI: 10.1080/10589759.2022.2085702
• Publication Date: 2022-08-11T12:40:11Z
• Authors: Fabien Léonard; Samuel Tammas-Wil...
• Keywords: Shrinkage

Fused filament fabrication (FFF), also known under the brand name fused deposition modelling, has recently emerged as a more straightforward and economic alternative to established 3D printing or additive manufacturing technologies such powder bed fusion for metal part manufacturing. In this work, we report on possible approaches measurements of FFF sintering shrinkage rates from X-ray computed tomography (XCT) data, with particular focus those that use greyscale are thus independent any errors introduced by segmentation. Metallic parts were produced using technology, which relies an isotropic scaling factor applied STL model be compensate happening during printed (green) part. We stainless-steel produced, not one along build direction was largest, other two being similar another. Overall, rate measured different methodologies all fell between 15 % 16 %. XCT data clearly showed typical defects encountered voids resulting insufficient overlap caused print head blockages, mitigated process. Autocorrelation way characterising structure sample before after sintering, rates.