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International
Standard
ISO/ASTM 52904
Second edition
Additive manufacturing of
2024-07
metals — Process characteristics
and performance — Metal powder
bed fusion process to meet critical
applications
Fabrication additive de métaux — Caractéristiques et
performances du procédé — Procédé de fusion sur lit de poudre
métallique en vue de répondre aux applications critiques
Reference number
© ISO/ASTM International 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
© ISO/ASTM International 2024 – All rights reserved
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Personnel requirements . 2
5 Digital data . 2
5.1 Digital data records.2
5.2 Digital data processing .2
6 PBF equipment requirements . 3
6.1 General .3
6.2 Build consumables .3
6.2.1 Build platform .3
6.2.2 Shielding gases .3
6.2.3 Powder spreading device .3
6.2.4 Compressed air .3
6.3 Auxiliary tools and equipment .4
6.4 Machine operating software .4
6.5 Environmental controls .4
7 Feedstock requirements . . 4
7.1 Purchasing feedstock .4
7.2 Control of feedstock .4
8 Qualification . 5
8.1 Design checks .5
8.1.1 Part files .5
8.1.2 Machining allowance .5
8.1.3 Orientation and location .5
8.1.4 Parts nesting .5
8.2 Pre-build checks .5
8.2.1 General .5
8.2.2 Maintenance and calibration status . .5
8.2.3 PBF machine elements and systems .6
8.2.4 Build chamber environment .6
8.2.5 Build platform .6
8.2.6 Powder spreading device .6
8.2.7 Gas supply .6
8.2.8 Feedstock condition and quantity .6
8.2.9 Baseline machine and process parameters .7
8.3 Periodic preventive maintenance .7
8.3.1 General .7
8.3.2 Energy delivery verification .7
8.3.3 Z-axis movement .7
8.3.4 Compressed air .7
8.3.5 Oxygen and vacuum .7
8.3.6 Laser field alignment (LFA) .7
8.3.7 Other recommended preventive maintenance .8
8.4 Machine, process, and part qualification .8
8.4.1 Process qualification .8
8.4.2 Build platform .8
8.4.3 Test specimens .8
8.4.4 Requalification .9
8.5 Consolidated material and part .9
© ISO/ASTM International 2024 – All rights reserved
iii
8.5.1 Material properties .9
8.5.2 Part properties .10
8.5.3 Non-conformities .10
9 Manufacturing plan and documentation .10
9.1 Manufacturing plan .10
9.2 Documentation .11
Annex A (informative) Example of a manufacturing plan .12
Bibliography .15
© ISO/ASTM International 2024 – All rights reserved
iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rule
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