3. Distribution
Inclusions come into being in a variety of sizes, shapes, states and locations, with numerous parameters. Their migration within the liquid sorts them out in nature and size; those that remain trapped in the solid metal range in size from a few nanometers to a few millimeters.
Exogenous and mixed inclusions resulting from the entrainment of foreign compounds are the largest, and their limits should be set at less than 100 µm.
Very fine inclusions, smaller than 0.1 µm, can be called precipitates, and their location is very specific. The fineness of these particles is due to their low formation temperature in solid steel. They are located at the δ, γ or α grain boundaries that exist at this temperature. Their fineness is also a direct function of the grain fineness
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Distribution
Identification and counting
References
Standardization
AFNOR standards
- Produits sidérurgiques. Méthodes de détermination de la teneur en inclusions non métalliques des aciers corroyés. Partie I. Méthodes macroscopiques. - NF A 04-105 - 10-86
- Produits sidérurgiques. Méthodes de détermination de la teneur en inclusions non métalliques des aciers corroyés. Partie II. Méthode micrographique à l'aide d'images types. - NF A 04-106 - 9-84
- Produits sidérurgiques....
Theses
- - http://www.sudoc.abes.fr
- PIOT (D.) - Prévision de la distribution des durées de vie en fatigue de roulement à partir des caractéristiques mécaniques et inclusionnaires de l'acier. - 2000. INSA Lyon....
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