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CEMENTITE [11 records]

Record 1 2023-10-17

English

Subject field(s)
  • Heat Treatment of Metals
Universal entry(ies)
Fe3C
formula, see observation
DEF

[An] iron carbide with the formula Fe3C.

CONT

Cementite consists of iron and carbon compounds combined chemically, having the chemical symbol Fe3C. It is composed of 93% iron and 7% carbon. This compound is brittle, hard and falls under the ceramic classification.

OBS

Chemical formula: written Fe3C

OBS

cementite : designation and definition standardized by ISO.

French

Domaine(s)
  • Traitement à chaud des métaux
Entrée(s) universelle(s)
Fe3C
formula, see observation
DEF

Carbure de fer dont la formule chimique est Fe3C.

OBS

Formule chimique : s'écrit Fe3C

OBS

cémentite : désignation et définition normalisées par l'ISO.

Spanish

Save record 1

Record 2 2010-05-27

English

Subject field(s)
  • Foundry Practice
DEF

A fine mixture of ferrite and cementite produced either by regulating the rate of cooling of steel or by tempering steel after hardening.

OBS

The first type is very fine pearlite that is difficult to resolve under the microscope; the second type is tempered martensite.

French

Domaine(s)
  • Fonderie
DEF

Terme désuet désignant un agrégat de ferrite et de cémentite obtenu en effectuant un revenu de l'acier après durcissement par trempe.

OBS

On utilisera de préférence les expressions martensite revenue ou bainite revenue.

Key term(s)
  • martensite revenue
  • bainite revenue

Spanish

Save record 2

Record 3 2003-06-18

English

Subject field(s)
  • Steel
DEF

A steel that contains more than 0. 83% carbon which with appropriate heat treatment consists of pearlite and cementite.

French

Domaine(s)
  • Acier
DEF

Acier dont la teneur en carbone, supérieure à 0,85%, constitue un réseau plus ou moins continu de cémentite dessinant le contour des grains de perlite.

Spanish

Save record 3

Record 4 2003-04-29

English

Subject field(s)
  • Raw Materials (Iron and Steel)
  • Ferrous Alloys
DEF

Lamellar aggregate of ferrite and cementite in the microstructure of cast iron and steel.(Gould, Dudley C., Metalcasting Dictionary, Illinois, American Foundrymen's Society, Inc., 1977, p. 128)

CONT

When a polished and etched sample of iron is viewed at low magnification, it can have a mother-of-pearl like appearance. This description has been contracted into the term, pearlite, as the name for the common constituent in iron and steel that has this appearance.(Gary and Ductile, Iron Castings Handbook, Cleveland, Iron Founder’s Society, Inc., 1971, p. 102)

French

Domaine(s)
  • Matières premières (Sidérurgie)
  • Alliages ferreux
DEF

Constituant micrographique des alliages fer-carbone, résolu à grossissement élevé sous forme de lamelles alternées et parallèles plus ou moins fines de ferrite sombre et de cémentite claire.

CONT

La perlite [...] qui est une succession de couches très minces de ferrite et de cémentite; elle contient 0.87% de carbone et c'est l'eutectique fer-carbone.

Spanish

Campo(s) temático(s)
  • Materias primas (Siderurgia)
  • Ferroaleaciones
Save record 4

Record 5 2000-06-12

English

Subject field(s)
  • Cast Iron
DEF

A cast iron made by prolonged annealing of white cast iron in which decarburization or graphitization, or both take place to eliminate some or all of the cementite.

CONT

The graphite is in the form of temper carbon. If decarburization is the predominant reaction, the product will exhibit a large fracture, hence, "whiteheart malleable;" otherwise, the fracture surface will be dark, hence, "blackheart malleable."

French

Domaine(s)
  • Fonte
DEF

Fonte obtenue en général par décarburation de la fonte blanche, constituant un matériau résilient et déformable qui se prête à l'élaboration de pièces de formes complexes.

Spanish

Save record 5

Record 6 1998-06-18

English

Subject field(s)
  • Foundry Practice
DEF

Clusters of finely divided graphite such as that found in malleable iron, that are formed as a result of decomposition of cementite, for example, by heating white cast iron above the ferrite-austenite transformation temperature and holding at these temperatures for a considerable period of time.

French

Domaine(s)
  • Fonderie
DEF

Appellation parfois utilisée pour désigner les nodules de graphite dans les fontes malléables.

Spanish

Save record 6

Record 7 1998-05-26

English

Subject field(s)
  • Foundry Practice
DEF

The name, conferred by Wust on the cementite-austenite eutectic containing 4. 3% C which freezes at 1, 130 °C.

OBS

During cooling the austenite in ledeburite may transform into a mixture of austenite and cementite. This iron-carbon phase is found in cast-irons and certain high alloy steels.

French

Domaine(s)
  • Fonderie
DEF

Microstructure d'un alliage eutectique fer-carbone, constituée d'un agrégat de cémentite et d'austénite, austénite se décomposant généralement en cémentite et en ferrite après passage au-dessous de la température eutectoïde (720 °C).

Spanish

Save record 7

Record 8 1997-09-30

English

Subject field(s)
  • Metallurgy - General
OBS

ledeburite : The eutectic of the iron-carbon system, the constituents being cementite and austenite at high temperatures; cooling decomposes the austenite to ferrite and cementite.

French

Domaine(s)
  • Métallurgie générale
OBS

lédebure : Mélange eutectique d'austénite et de cémentite, cristallisant à 1145 °C et qui se trouve dans les alliages fer-carbone.

OBS

sur le modèle austénite - austénitique, martensite - martensitique, etc.

Spanish

Save record 8

Record 9 1993-04-23

English

Subject field(s)
  • Steel
DEF

A test for determining the grain-size characteristics of a steel in which a sample is carburized for 8 hours at 1700 °F(927°C) and cooled slowly; the high-carbon case on slow cooling will reject cementite at the austenite grain boundaries and, by polishing and etching, the grains will clearly be seen under a microscope.

French

Domaine(s)
  • Acier
DEF

Méthode de contrôle de grosseur de grain austénitique pour les aciers de cémentation, consistant à cémenter un acier dans un cément normalisé, puis à mesurer par microscope les grains ainsi mis en évidence.

Spanish

Save record 9

Record 10 1975-03-11

English

Subject field(s)
  • Metal Processing
CONT

the structural reason for this is that whereas in annealed or normalized steels, the cementite is present in pearlite as platelets that are to some extent embrittling.

French

Domaine(s)
  • Transformation des métaux
CONT

à de plus basses températures, on a à côté de la ferrite ou de la cémentite une perlite lamellaire constituée par des lamelles alternées de cémentite et de ferrite.

Spanish

Save record 10

Record 11 1975-03-11

English

Subject field(s)
  • Cast Iron
OBS

--cast iron with a structure consisting of a mixture of free cementite, free graphite and pearlite.

French

Domaine(s)
  • Fonte
OBS

--fonte grise solidifiée selon un système mixte (...) et constituée d'un mélange en proportions variables de fonte blanche et de fonte grise

Spanish

Save record 11

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