AS ISO ASTM 52907:2021 pdf free downoad – Additive manufacturing – Feedstock materials -Methods to characterize metal powders

AS ISO ASTM 52907:2021 pdf free downoad – Additive manufacturing – Feedstock materials -Methods to characterize metal powders.
This document provides technical specifications for metallic powders intended to be used in additive
manufacturing and covers the following aspects:
— documentation and traceability;
— sampling;
— particle size distribution;
— chemical composition;
— characteristic densities;
— morphology;
— flowability;
— contamination;
— packaging and storage.
This document does not deal with safety aspects.
In addition, this document gives specific requirements for used metallic powders in additive
manufacturing.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 2591-1, Test sieving — Part 1: Methods using test sieves of woven wire cloth and perforated metal plate
ISO 3252, Powder metallurgy — Vocabulary
ISO 3923-1, Metallic powders — Determination of apparent density — Part 1: Funnel method
ISO 3923-2, Metallic powders — Determination of apparent density — Part 2: Scott volumeter method
ISO 3953, Metallic powders — Determination of tap density
ISO 3954, Powders for powder metallurgical purposes — Sampling
ISO 4497, Metallic powders — Determination or particle size by dry sieving
ISO 13320, Particle size analysis — Laser diffraction methods
ISO 13322-1, Particle size analysis — Image analysis methods — Part 1: Static image analysis methods
ISO 13322-2, Particle size analysis — Image analysis methods — Part 2: Dynamic image analysis methods
4.9 Contamination
contamination of the powder lot shall be determined by examining a representative sample of the powder. Powder sampling shall be performed according to 4.3. Powder testing shall be performed by examining at least 625 mm2 (25 mm 25 mm) of a closely packed layer ol powder at 20x, or by an alternative testing practice, subjected to a prior customer/supplier agreement. As agreed by customer/supplier, no foreign material containing morphology or chemistry outside of specification shall be visible under these test conditions.
NOTE In addition, EDX mapping can be used to detect cross contamination with another metallic powder.
4.10 Packaging, handling and storage
4.10.1 General
Powder contamination from any form of foreign material (e.g. desiccant bag) shall he avoided during handling, packaging and storage.
4.10.2 Packaging and handling
The powder should 1w climatized (temperature) twtore introduced to the machine.
If required by the customer, powder containers can be filled by inert gas (argon or nitrogen) to provide protective atmosphere. Powder traceability shall be secured. The label shall include the following:
— the name and the address of the supplier.
-— the reference of powder lot,
— quantity of the packaging unit.
— the packaging description, including the packaging, the nature of the shielding gas and the desiccant bag if relevant,
— the product description, including standard and/or trade/common name,
— the safety notice a cording to local regulation, which can include pictegram(s.
The following information can be included in the certificate if not included in the label:
— if applicable, the order number of the customer,
— the nature of powder production process (including e.g. type of gas used, environment conditions),
— the packing date,
NOTE It desiccant bag is used, guidance can be lound in DIN 55474 and BS 1 133•19
IXAMPLES Product description: Alloy of nickel 711:1 powder 10pm to 45 pm.
Packaging description: 10 kg bottlc under Ar protective atmosphere with desiccant hag.
Nature of powder production process: Vacuum induction melting [VIM), argon gas atomization or argon electrode inductionmclting.. Nitrogen gas atomization or Air induction melting, water atomization.