Computed tomography based procedure for reproducible porosity measurement of additive manufactured samples. (April 2019)

• Record Type: Journal Article
• Authors: Zikmund, Tomáš; Šalplachta, Jakub; Zatočilová, Aneta; Břínek, Adam; Pantělejev, Libor; Štěpánek, Roman; Koutný, Daniel; Paloušek, David; Kaiser, Jozef
• Is Part Of: NDT & E international. Volume 103(2019)
• Page Start: 111
• Page End: 118
• Publication Date: 2019-04
• Subjects: Porosity measurement -- SLM sample -- Metallography -- Micro tomography -- Automatic pores segmentation; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2019.02.008
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: Metallic parts made by selective laser melting technology are evaluated for internal porosity. The non-standardized pores segmentation is one of the key aspects to apply in order to achieve a precise porosity measurement using X-ray computed micro tomography. In this work, we present a new porosity analysis procedure which is based on the global thresholding and the correlation with metallographic image data. The procedure is independent on the obtained voxel resolution and makes an analysis reproducible. The novelty of this work is that the computed tomography is used for a comparative porosity analysis of samples from separate measurements. The functionality of proposed procedure is demonstrated on a test sample of aluminium alloy and is compared to standardly used procedures. Highlights: New comparative porosity analysis procedure for SLM test samples based on X-ray computed tomography. Correlation of tomographic data with metallographic image for objective threshold selection. Study of manual threshold selection in comparison with standard automatic approaches and with new proposed method. The procedure demonstrated and evaluated on aluminium alloy of AlCu2Mg1.5Ni including several types of inner defects.