1.1 This Guide discussed the use of established and emerging nondestructive testing (NDT)procedures used during the life cycle of additively manufactured metal, plastic and ceramic parts. 1.2 The parts covered by this Guide are used in aerospace applications; therefore, the inspection requirements for discontinuities and inspection points will in general be different and more stringent than for vessels used in non aerospace applications. 1.3 The metals under consideration include but are not limited to ones made from aluminum alloys, titanium alloys (Ti-6Al-4V), nickel-based alloys, and stainless steels. The plastics under consideration include but are not limited to acrylonitrile butadiene styrene (ABS) terpolymer and poly(ether ketone ketone) (PEKK). The ceramics under considerationregolith, alumina, zircoium oxides, and silicon carbide. NOTE The combustion and ignition properties of finished part need to be taken into account for safe use in aerospace applications. 1.4 Protocols for controlling input materials, and established processes and post-process methods are cited whenever possible. The processes under consideration include but are not limited to Electron Beam Free From Fabrication (EBF3), electron beam melting (EBM), Direct Metal Laser Sintering (DMLS), and Selective Laser Melting (SLM). 1.5 This Guide does does not establish or recommend procedures for space-based additive manufacturing. 1.6 The Guide describes the application of established and emerging NDT procedures; namely, Computed Tomography (CT, Section 7), Eddy Current Testing (ECT, Section 8), Penetrant Testing (PT, Section 9), Thermographic Testing (TT, Section 10), Structured Light (SL, Section 11), and Ultrasonic Testing (UT, Section 12). These procedures can be used by cognizant engineering organizations for detecting and evaluating flaws and defects during and after fabrication. 1.7 This Guide describes established practices that have a foundation in experience, and new practices that have yet to be validated. The latter are included to promote research and later elaboration in this Guide as methods of the former type. 1.8 This Guide does not specify accept-reject criteria to be used in procurement or used as a means for approving additively manufactured parts for service. Any acceptance criteria specified are given solely for purposes of refinement and further elaboration of the procedures described in this Guide. 1.9 To insure proper use of the referenced standard documents, there are recognized NDT specialists that are certified according to industry and company NDT specifications. It is recommended that an NDT specialist be a part of any part design, process control, finished part quality assurance, in service maintenance or damage examination. 1.10 The values stated in metric units are to be regarded as the standard. The English units given in parentheses are provided for information only.
There are no voluntary consensus standards for NDT of AM parts either in E07 or F42. Also, until NDT qualification and certification procedures become are implemented, use of AM parts in aerospace application will be impeded.
Keywordsnondestructive testing; additive manufacturing; space manufacturing; in situ process control; process monitoring; finished part inspection; flight hardware; certification and validation
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development