Computed Tomography for the Nondestructive Testing of Additive Manufactured Components: Opportunities and Limitations

2021 ◽  
Vol 79 (6) ◽  
pp. 520-528
Author(s):  
Lennart Schulenburg
Keyword(s):  
Computed Tomography ◽  
Quality Assurance ◽  
Production Process ◽  
Surface Finishing ◽  
Nickel Steel ◽  
Powder Bed ◽  
Radiographic Testing ◽  
Thickness Measure ◽  
Channel Surface ◽  
Component Development

The additive manufacturing (AM) process has grown from university research laboratories into a production process for complex-shaped components. Due to the uniqueness of the manufacturing process, new challenges have arisen regarding process control, quality assurance, and surface finishing. This paper will show how the nondestructive radiographic testing (RT) technique computed tomography (CT) can make a valuable contribution to quality assurance at each step of the AM process. The use of CT is demonstrated using an example of chrome-nickel steel nozzles manufactured using the laser powder bed fusion (LPBF) process. The surface of the nozzles is then reworked with the Hirtisation process, a trademarked part finishing technology that is based on a combination of electrochemical pulse methods, hydrodynamic flow and particle assisted chemical removal, and surface treatment. In addition to the already known use of CT for detecting internal discontinuities, CT can be used to ensure sufficient wall thickness, measure internal channel surface roughness, and gauge the geometrical correctness of parts. In this paper, it is demonstrated how to use this RT technique to optimize the design and production process during the component development phase.

scholarly journals Gold, Silver, and Electrum Electroless Plating on Additively Manufactured Laser Powder-Bed Fusion AlSi10Mg Parts: A Review

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 422
Author(s):  
Dana Ashkenazi ◽  
Alexandra Inberg ◽  
Yosi Shacham-Diamand ◽  
Adin Stern
Keyword(s):  
Additive Manufacturing ◽  
Low Cost ◽  
Ion Beam ◽  
Surface Finishing ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Finishing Process ◽  
Gold Silver ◽  
3D Printed

Additive manufacturing (AM) revolutionary technologies open new opportunities and challenges. They allow low-cost manufacturing of parts with complex geometries and short time-to-market of products that can be exclusively customized. Additive manufactured parts often need post-printing surface modification. This study aims to review novel environmental-friendly surface finishing process of 3D-printed AlSi10Mg parts by electroless deposition of gold, silver, and gold–silver alloy (e.g., electrum) and to propose a full process methodology suitable for effective metallization. This deposition technique is simple and low cost method, allowing the metallization of both conductive and insulating materials. The AlSi10Mg parts were produced by the additive manufacturing laser powder bed fusion (AM-LPBF) process. Gold, silver, and their alloys were chosen as coatings due to their esthetic appearance, good corrosion resistance, and excellent electrical and thermal conductivity. The metals were deposited on 3D-printed disk-shaped specimens at 80 and 90 °C using a dedicated surface activation method where special functionalization of the printed AlSi10Mg was performed to assure a uniform catalytic surface yielding a good adhesion of the deposited metal to the substrate. Various methods were used to examine the coating quality, including light microscopy, optical profilometry, XRD, X-ray fluorescence, SEM–energy-dispersive spectroscopy (EDS), focused ion beam (FIB)-SEM, and XPS analyses. The results indicate that the developed coatings yield satisfactory quality, and the suggested surface finishing process can be used for many AM products and applications.

scholarly journals Creation of sophisticated test objects for quality assurance of optical computed tomography scanners

2010 ◽  
Vol 250 ◽  
pp. 012046 ◽  
Author(s):  
A T Abdul Rahman ◽  
Elke Bräuer-Krisch ◽  
Thierry Brochard ◽  
John Adamovics ◽  
Steve Clowes ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Quality Assurance ◽  
Optical Computed Tomography ◽  
Tomography Scanners ◽  
Test Objects

Sophisticated test objects for the quality assurance of optical computed tomography scanners

2011 ◽  
Vol 56 (14) ◽  
pp. 4177-4199 ◽  
Author(s):  
A T Abdul Rahman ◽  
Elke Bräuer-Krisch ◽  
Thierry Brochard ◽  
John Adamovics ◽  
S K Clowes ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Quality Assurance ◽  
Optical Computed Tomography ◽  
Tomography Scanners ◽  
Test Objects

scholarly journals Mechanism of the quality cost administration system

2021 ◽  
pp. 23-26
Author(s):  
Serhii TKACHENKO ◽  
Olena POTYSHNIAK ◽  
Yevheniia POLIAKOVA
Keyword(s):  
Quality Assurance ◽  
Production Process ◽  
Cost Management ◽  
Quality Cost ◽  
Cost Of Quality ◽  
Quality Of Work ◽  
Quality Assurance Process ◽  
Assurance Process ◽  
The Cost

Strengthening the impact of the production and economic mechanism on increasing the economic efficiency of the production process and the quality of work is possible on the basis of choosing the most effective ways to achieve high end results of the national economic system of the country. One of these ways is the inclusion in the system of controlled parameters of the economic parameters of quality cost management, the use of which guarantees the quality coordination system to reach a given economically justified state. Adjustment of quality costs consists in maintaining the established proportions between the costs of quality assurance (quality) and the mismatch of work quality indicators, which is achieved by controlling the level of defects, maintaining certain conditions, rules and norms corresponding to the optimal mode of work on quality assurance and the optimal value costs. The quality assurance process is based on a classification represented by a range of activities aimed at ensuring the quality of tools, objects of labour, living labour and information data at all stages of the production process. The costing methodology is based on the selection of the costing object and costing units. Representation of work on quality assurance as an object of calculation, and hours of work or total amount of work as calculation units allows at the right time to present in value terms both the quality assurance process as a whole and the cost of quality for the product. The recommended mechanism of the cost management system in general is focused on a wide range of enterprises and associations, and its use allows to obtain the effect of minimizing the cost of quality, as well as improve the quality of work to ensure product quality, ice directly contribute to production efficiency and quality. Increase of economic benefit at the expense of cost control system solutions of the problem in the future is possible if its implementation on the basis of the theory of functional management development, conversion of static model into a dynamic coordination costs.

scholarly journals Quality assurance for computed-tomography simulators and the computed-tomography-simulation process: Report of the AAPM Radiation Therapy Committee Task Group No. 66

2003 ◽  
Vol 30 (10) ◽  
pp. 2762-2792 ◽  
Author(s):  
Sasa Mutic ◽  
Jatinder R. Palta ◽  
Elizabeth K. Butker ◽  
Indra J. Das ◽  
M. Saiful Huq ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Quality Assurance ◽  
Radiation Therapy ◽  
Task Group ◽  
Simulation Process

scholarly journals Gold–Silver Electroless Plating on Laser Powder-Bed Fusion Additively Printed AlSi10Mg Parts

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 557 ◽  
Author(s):  
Alexandra Inberg ◽  
Dana Ashkenazi ◽  
Giora Kimmel ◽  
Yosi Shacham-Diamand ◽  
Adin Stern
Keyword(s):  
Deposition Process ◽  
Xrd Analysis ◽  
Binding Energies ◽  
Surface Finishing ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Developed Surface ◽  
Finishing Process ◽  
Gold Silver

The current research presents a novel methodology for surface finishing of printed AlSi10Mg parts by electroless deposited gold–silver (electrum) alloys. The parts were printed by additive manufacturing laser powder-bed fusion (AM-LPBF). The electrum was chosen due to its appearance and good electrical and thermal properties and was deposited on disk-shaped specimens at 80 and 90 °C. The coating quality and appearance were studied by different methods for various deposition times and film thicknesses. The results indicate that Au–Ag coatings of AM-LPBF AlSi10Mg yield satisfactory results. The XRD analysis revealed that the coatings were composed of Au–Ag crystalline phases and beneath them, a quasi-amorphous or mixed quasi-amorphous and nanocrystalline Ni–P interlayer. The mechanism of electrum formation was studied based on the XPS analysis results as a function of the temperature and concentration. At 80 °C, the Ag was dominant at the beginning of the deposition process, while at 90 °C the Au was first detected on the interface. This result was explained by the electrochemical properties of alloying metals and the binding energies required to form metal–Ni and Au–Ag bonding. The results indicate that the electrum coatings are satisfactory, and the developed surface finishing process could be used for many applications.

Sign in / Sign up

Export Citation Format

Share Document