ISO 13947:2011 specifes a metallographic method for determining the non-metallic inclusion level in metal powders using a powder-forged specimen. The test method covers repress powder-forged test specimens in which there has been minimal lateral fow (<1 %). The core region of the powder-forged test specimen contains no porosity detectable at 100× magnifcation.
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 signifcant amount of material fow, the near-neighbour separation distance needs to be changed, or the inclusion sizes agreed between the parties need to be adjusted.
