The ISO 643 standard, developed by the International Standards Organization (ISO), describes a micrographic method applied to determine the apparent ferritic or austenitic grain size in steels. This standard has been published in our country by the Turkish Standards Institute with the following title: TS EN ISO 643 Steels - Micrographic determination of visible grain size.
The method described in this standard is aimed at determining the grain boundaries of steels and estimating the average grain size of samples with unimodal size distribution.
At the same time, the American Test and Materials Association (ASTM) developed a standard test method standard for ASTM E112 average grain size determination in the same subject.
Metallic alloys are used in many industries. Alloys play a critical role, especially for cars, trucks, trains, planes and other types of transport. The characterization of these alloys, especially grain size analysis, is important for the automotive and shipping industries. Thousands of standard alloys are used today, and new alloys with better performance are being developed to meet new demands. For example, a large number of steel alloys are used in the production of cars, trucks, planes and trains.
Bu When using alloys, it is necessary to know the properties related to composition and microstructure. Tensile strength, elongation, and thermal and electrical conductivity have a significant effect on microstructural properties such as phases, grains or inclusions. A good understanding of the relationship between microstructure and macroscopic properties is important for the design and manufacture of alloys.
Grains are microscopic crystals formed in alloys during the cooling phase of production. It has long been known that as the grain size increases, the tensile strength and yield strength of the alloy decrease, the elongation at fracture increases and the ductile brittle transition temperature increases. Different test methods are used to investigate the microstructure of alloys.
Among the services provided by our organization within the framework of metallic testing services, there are also ISO 643 standard tests.
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