Provningsmetod för bestämning av ickemetalliska inneslutningar i metalliska pulver genom användning av pulversmidda provkroppar (ISO 13947:2007, IDT)
This International Standard specifies a metallographic method for determining the non-metallic inclusion level inmetal powders using a powder-forged specimen. The test method covers repress powder-forged testspecimens in which there has been minimal lateral flow (). The core region of the powder-forged testspecimen contains no porosity detectable at magnification.
This test method can also be used to determine the non-metallic inclusion content of powder-forged steel parts.However, in parts where there has been a significant amount of material flow, the near-neighbour separationdistance needs to be changed, or the inclusion sizes agreed between the parties need to be adjusted.
This test method is not suitable for determining the non-metallic inclusion level of parts that have been forgedsuch that the core region contains porosity. At the magnification used for this test method, residual porosity ishard to distinguish from inclusions. Too much residual porosity makes a meaningful assessment of the inclusionpopulation impossible.
This test method may be applied to materials that contain manganese sulfide (admixed or prealloyed), providedthe near-neighbour separation distance is changed from 30µm to 15µm.