BS EN ISO 4884:2019 pdf – Hardmetals – Sampling and testing of powders using sintered test pieces (ISO 4884:2019).
1 Scope This document specifies procedures for the sampling and testing of powder mixtures for the manufacture of hardmetals, using sintered test pieces. It also covers the preparation of test pieces. 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 3327, Hardmetals — Determination of transverse rupture strength ISO 3369, Impermeable sintered metal materials and hardmetals — Determination of density ISO 3738-1, Hardmetals — Rockwell hardness test (scale A) — Part 1: Test method ISO 3738-2, Hardmetals — Rockwell hardness test (scale A) — Part 2: Preparation and calibration of standard test blocks ISO 3954, Powders for powder metallurgical purposes — Sampling ISO 4499-1, Hardmetals — Metallographic determination of microstructure — Part 1: Photomicrographs and description ISO 4499-2, Hardmetals — Metallographic determination of microstructure — Part 2: Measurement of WC grain size ISO 4499-3, Hardmetals — Metallographic determination of microstructure — Part 3: Measurement of microstructural features in Ti (C, N) and WC/cubic carbide based hardmetals
ISO 4499-4, Hardmetals — Metallographic determination of microstructure — Part 4: Characterisation of porosity, carbon defects and eta-phase content ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method ISO 6507-2, Metallic materials — Vickers hardness test — Part 2: Verification and calibration of testing machines ISO 6507-3, Metallic materials — Vickers hardness test — Part 3: Calibration of reference blocks ISO 6507-4, Metallic materials — Vickers hardness test — Part 4: Tables of hardness values ISO 28079, Hardmetals — Palmqvist toughness test
3? Terms? and? definitions For the purposes of this document, the terms and definitions given in ISO 3954 apply and the following. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https: //www .iso .org/obp — IEC Electropedia: available at http: //www .electropedia .org/ 4 Sampling 4.1 Sampling from a lot shall be carried out in accordance with ISO 3954. 4.2 In the event that a batch is blended into one lot in one blender as the last operation before separation into containers, then by agreement between producer and consumer, one or more test samples may be taken from the blender. 5 Preparation of test pieces 5.1 The test pieces shall be processed from the test sample in conformity with their grade and dimensions. All the test pieces for each type of testing shall be sintered simultaneously under the same conditions and in the same furnace. 5.2 To ensure that the characteristics of the test pieces prepared from the lot of powder are significant, the appropriate manufacturing conditions shall be used in the production of the test pieces. 5.3 The dimensions of the test pieces shall comply with the requirements of the relevant International Standards specified in Table 1. For the determination of porosity, one or more test pieces shall be sectioned to enable a total area of not less than 1 cm 2 to be examined. 6 Testing Tests on sintered test pieces from a lot of powder shall be carried out in accordance with the International Standards given in Table 1.
The determination of the characteristics listed in Table 1 may be carried out on the same test pieces but the determination of hardness, microstructure and porosity shall not be carried out before the determination of transverse rupture strength. NOTE 1 Because of the high scatter given by the transverse rupture test, its value is limited when testing an individual lot of powder. NOTE 2 Chemical analysis can be carried out on a test sample taken from the powder lot or on a sintered test piece.