ISO 945-1-2019 pdf free.Microstructure of cast irons—Graphite classification by visual analysis.
This document specifies a method of classifying the microstructure of graphite in cast irons bycomparative visual analysis.
The purpose of this document is to provide information about the method of graphite classification. ltis not intended to give information on the suitability of cast-iron types and grades for any particularapplication.
The particular material grades are specified mainly by mechanical properties and, in the case ofaustenitic and abrasion resistant cast irons,by their chemical composition.The interpretationof graphite form and size does not allow a statistically valid statement on the fulfilment of therequirements specified in the relevant material standard.There are no normative references in this document.No terms and definitions are listed in this document.
When cast iron materials are examined under a microscope in accordance with this document, thegraphite shall be classified by the following:
its form, designated by Roman numbers I to Vl(see Figure 1 and Annex A); its distribution, designated by capital letters A to E(see Figure 2 and Annex B); the graphite distribution designation is only specified for grey cast irons (form l); its size, designated by numbers 1 to 8 (see Figures 3,4 and 5 and Table 1).
The reference images given in Figures 1, 2,3,4 and 5 provide a basis for classifying graphite forms,distribution and size.The characteristic features of the graphite which occur are designated by lettersand numbers.For this purpose, microstructures of graphite are arranged in a series of reference imagesconsisting of schematic microstructures of cast irons. The form, distribution and size of the graphiteobserved are determined by comparison with the reference images. The classification is allocated asthe same as that of the images that resemble them most closely at the same magnification.
NOTE The comparison of actual microstructures with schematic images or photomicrographs depends onthe subjective impression of the metallographer.
When taking samples from a casting, it is essential that attention be paid to the location, to the wallthickness, to the distance from the surface and to the presence of chills. The location of the sample inthe casting shall be recorded in a report.
lf more than one casting is examined, the samples shall be taken from the same location in each castingfor the purpose of comparability.
The location of the metallographic specimen shall be agreed between the manufacturer and thepurchaser.ISO 945 pdf download.