ISO/TC 119/SC 3 - Sampling and testing methods for sintered metal materials (excluding hardmetals)

This document specifies a method for the determination of the fluid permeability of permeable sintered metal materials in which the porosity is deliberately continuous or interconnecting, testing being carried out under such conditions that the fluid permeability can be expressed in terms of viscous and inertia permeability coefficients (see Annex A). This document does not apply to very long hollow cylindrical test pieces of small diameter, in which the pressure drop of the fluid in passing along the bore of the cylinder might not be negligible compared with the pressure drop of the fluid passing through the wall thickness (see A.5).

ISO 5754 specifies the dimensions of an unnotched impact test piece of sintered metal materials. The test piece may be obtained directly by pressing and sintering or by machining a sintered part. ISO 5754 applies to all sintered metals and alloys, with the exception of hardmetals. However, for certain materials (for example, materials with low porosity or materials with high ductility), it may be more appropriate to use a notched test piece which, in this case, will give results with less scatter. (In this case, refer to ISO 148‑1.) NOTE For porous sintered materials, the results obtained from impact tests are not necessarily very accurate compared with results obtained from tests on solid metals.

ISO 3928:2016 specifies - the die cavity dimensions used for making fatigue test pieces by pressing and sintering, together with certain dimensions of the test piece obtained from such a die, and - the dimensions of the test pieces machined from sintered and powder forged materials. ISO 3928:2016 is applicable to all sintered metals and alloys, excluding hardmetals.

ISO 14317:2015 specifies a method for the determination of the compressive yield strength of sintered metal materials, excluding hardmetals. This method is applicable to sintered materials (excluding hardmetals) that might or might not have been subjected to heat treatment after sintering and also to materials that have been sized or coined after sintering.

ISO 7265:2012 specifies methods for preparing a sample from one or more sintered parts to be analysed for free or total carbon content. Combined carbon is determined as the difference between total and free carbon. This standard covers the preparation of samples for the determination of carbon by a chemical method, i.e. combustion in oxygen and measurement of the carbon dioxide produced, in accordance with ISO 437. It does not cover the preparation of samples for carbon determination by physical methods, such as metallography or spectroscopy.

ISO 2739:2012 specifies a method of measuring the radial crushing strength of sintered metal parts in the form of hollow cylinders, commonly known as bushings. This method is applicable to sintered bushings composed of pure or alloyed metal powders.

ISO 28279:2010 specifies the determination of the amount and nature of the surface contamination of powder-metallurgy (PM) parts (i.e. the level of cleanliness of PM parts).

ISO 4498:2010 specifies methods of hardness testing of sintered metal materials, excluding hardmetals. Procedure 1 determines the apparent hardness of the whole material. Procedure 1 applies to sintered metal materials which have either not been subjected to any heat treatment, or which have been heat treated in such a way that the hardness is essentially uniform to a depth of at least 5 mm below the surface, applies to the surfaces of sintered metal materials which have been treated in such a way that the hardness is not uniform in the section to a depth of 5 mm below the surface, therefore applies to materials in which the hardness is obtained essentially by surface enrichment by carbon, or by carbon and nitrogen (for example, by carburizing, carbonitriding, nitrocarburizing or sulphidizing), and applies to materials which have been induction hardened. Procedure 2 determines the microhardness of the metal phase. Procedure 2 applies to all types of sintered metal materials, is used, in particular, to determine the hardness profile of case‑hardened or carbonitrided materials in accordance with the method described in ISO 4507, and also applies to any sintered metallic materials which have been subjected to surface treatments such as electrodeposited plating, chemical coating, chemical vapour deposition (CVD), physical vapour deposition (PVD), laser, ion bombardment, etc. To determine the microhardness of treated surfaces, Procedure 2 applies.

ISO 23519:2010 specifies a method to determine the surface roughness of sintered parts of metal materials. It also establishes principles for the use of the suitable parameters for measurement.

ISO 2740:2009 is applicable to all sintered metals and alloys, excluding hardmetals. ISO 2740:2009 specifies: 1) the die cavity dimensions used for making tensile test pieces by pressing and sintering, and by Metal Injection Moulding (MIM) and sintering; and 2) the dimensions of tensile test pieces machined from sintered and powder forged materials.

ISO 3369:2006 specifies a method of determining the density of impermeable sintered metal materials and hardmetals.

Gives a method for the determination of the transverse rupture strength of sintered metals, excluding hardmetals. Particularly suitable for comparing the sintered strength of a batch of metal powder with that of a reference powder or with a reference strength.

This second edition cancels and replaces the first edition (i.e. ISO 3312:1975). Specifies a method for the determination of the dynamic (adiabatic) Young moduls by longitudinal oscillations of sintered metal materials and hardmetals. Gives principle, symbols and units, apparatus, preparation of the pieces, procedure, expression of results and test report.

Specifies a method for the detrmination of the pore size of filters, porous bearings, porous electrodes and other parts with interconnected porosity. The bubble test shall be considered as a quality control test and not as a test for defining filter grades of determining exact pore size and pore size distribution.

ISO 2740:2007 is applicable to all sintered metals and alloys, excluding hardmetals. ISO 2740:2007 specifies: the die cavity dimensions used for making tensile test pieces by pressing and sintering, and by Metal Injection Moulding (MIM) and sintering; the dimensions of tensile test pieces machined from sintered and powder forged materials.

ISO 2739:2006 specifies a method of measuring the radial crushing strength of sintered metal parts in the form of hollow cylinders, commonly known as bushes. This method is applicable to sintered bushes composed of pure or alloyed metal powders.

ISO 14317:2006 specifies a method for the determination of the compressive yield strength of sintered metal materials, excluding hardmetals. This method is applicable to sintered materials, excluding hardmetals, that may or may not have been subjected to heat treatment after sintering, and also to materials that have been sized or coined after sintering.

ISO 7625:2006 specifies methods for preparing a sample from one or more sintered parts of materials to be analysed for free or total carbon content. Combined carbon is determined as the difference between total and free carbon. This standard covers the preparation of samples for the determination of carbon by a chemical method, i.e. combustion in oxygen and measurement of the carbon dioxide produced, in accordance with ISO 437. It does not cover the preparation of samples for carbon determination by physical methods, such as metallography or spectroscopy.

ISO 4498:2005 specifies methods of hardness testing of sintered metal materials, excluding hardmetals. Procedure 1 determines the apparent hardness of the whole material. Procedure 2 determines the microhardness of the metal phase.

Applies to sintered materials not subjected to heat treatment and sintered materials heat treated in such a way that hardness is essentially uniform to a depth of at least 5 mm below the surface. Gives apparatus, sampling and preparation of test pieces, test requirements, expression of results and test report. An annex contains conditions for Rockwell hardness test.

This second edition cancels and replaces the first edition (i. e. ISO 4022:1977). The test is carried out under such conditions that the fluid permeability can be expressed in terms of viscous and inertia permeability coefficients (see annex A). Does not apply to very long hollow cylindrical test pieces of small diameter. Annex B gives test fluids.

Applies to the chemical determination of free or total carbon content in parts in which carbon is uniformly distributed and present in the forms shown in table 1. Combined carbon is determined as the difference between total and free carbon. The presence of carbonaceous materials in the pores or on the surface interferes with the determination of carbon, see table 2.

Applies to sintered materials which have been heat treated in such a way that hardness is not uniform in the section to a depth of 5 mm below the surface (by treatments such as carburizing, carbonitriding, nitrocarburizing or sulphidizing). Gives principle, apparatus, sampling and preparation of test pieces, test requirements, expression of results and test report.t.

Specifies the dimensions of an unnotched impact test piece of sintered metal materials. The test piece may be obtained directly by pressing and sintering or by machining a sintered part. For certain materials with high ductility, it may be more appropriate to use a notched test piece.

For determination of density of permeable sintered metal materials see ISO 2738. Specifies principle, apparatus, sampling, procedure, expression of results and test report. The two figures illustrate the weighing in water and the weighing in air.

Specifies a method of measuring the radial crushing strength of sintered metal parts in the form of hollow cylinders commonly known as bushes. The method is applicable to sintered bushes composed of pure or alloyed metal powders. Gives principle, apparatus, test piece, procedure, expression of results and test report.