- Hot search：
ISO 13947-2011 pdf free download
ISO 13947-2011 pdf free download.Metallic powders Test method for the determination of non-metallic inclusions in metal powders using a powder-forged specimen
Poudres metalliques — Determination de Ia teneur en inclusions non métalliques dans les poudres metalliques a I’aide d’une éprouvette forgée de poudre.
The maximum Feret’s diameter is used to determine inclusion size. A Ferets diameter is a caliper diameter, as illustrated in Figure 1.
The fragmented nature of some inclusions means that their size determination is somewhat complicated. The concept of near-neighbour separation shall be used in determining inclusion size. According to this concept, if an inclusion is within a certain distance of its neighbouring particles, it is considered a member of an inclusion cluster or agglomerate. Detected features within 30 pm of one another are considered part of the same inclusion. The concept is illustrated schematically in Figure 2.
The non-metallic inclusion level of the test specimen (part) is reported as the number of inclusions, per 100 mm2, greater than or equal to the predetermined size.
4 Significance and use
4.1 The non-metallic inclusion level of ferrous powders is an indication of powder cleanliness. In pressed and sintered ferrous powder metallurgy (PM) materials, the extensive porosity present masks the effect of inclusions on mechanical properties. In contrast, the properties of a PM material processed to near pore-free density are strongly influenced by the composition, size, size distribution, and location of non-metallic indusions.
4.2 The test for non-metallic inclusions in fully dense steel parts is useful as
— a characteristic to classify or differentiate one grade of powder or batch of parts from another, and
— a lot-to-lot quality comparison of powders intended for powder forging.
4.3 A significant amount of variation in non-metallic inclusion content will occur
— if the powder used to form the test specimen (part) does not meet the required quality standards for nonmetallic inclusion content, or
— processing of the test specimen (part) has been carried out under conditions that do not permit oxide reduction or allow oxidation of the test specimen (part), or both.
4.4 The use of the near-neighbour concept offers a more conservative estimate of the inclusions: it will overestimate rather than underestimate them.
5.1 Equipment, for the metallographic preparation of test specimens.ISO 13947-2011 pdf free download.
All resources on this website are from the Internet. It is only for personal study and research. No one is allowed to use it for any commercial purpose. If you need, please buy the genuine standard. If there is any infringement of your copyright, please contact the webmaster in time, and I will correct it immediately.
- Maybe you like
- Latest Updates
- ISO 287-2009 pdf free download
- ISO 527-5-2009 pdf free download
- ISO 659-2009 pdf free download
- ISO 660-2009 pdf free download
- ISO 712-2009 pdf free download
- ISO 725-2009 pdf free download
- ISO 730-2009 pdf free download
- ISO 927-2009 pdf free download
- ISO 2041-2009 pdf free download
- ISO 3040-2009 pdf free download
- ISO 3506-2-2009 pdf free download
- ISO 3506-3-2009 pdf free download