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GAMMA IRON [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2005-01-10

English

Subject field(s)
  • Foundry Practice
DEF

Composed principally of austenite.

OBS

austenite : A solid solution of one or more elements in face-centered cubic iron(gamma iron).

French

Domaine(s)
  • Fonderie
DEF

Qui renferme de l'austénite, relatif à l'austénite.

OBS

austénite : Constituant micrographique des aciers, solution solide de fer gamma et de carbone.

Spanish

Campo(s) temático(s)
  • Fundición
DEF

Perteneciente o relativo a la austenita.

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Record 2 2004-12-10

English

Subject field(s)
  • Steel
DEF

A solid solution of one or more elements in face-centered cubic iron(gamma iron).

OBS

Unless otherwise designated (such as nickel austenite), the solute is generally assumed to be carbon.

French

Domaine(s)
  • Acier
DEF

Constituant micrographique des aciers, solution solide de fer gamma et de carbone.

Spanish

Campo(s) temático(s)
  • Acero
DEF

Carburo de hierro presente en los aceros templados.

CONT

La austenita es una solución sólida de hierro y de carbono. Solamente es estable a temperaturas muy elevadas, pero, mediante un templado muy enérgico, se logra que permanezca artificialmente en equilibrio en ciertos aceros especiales (particularmente en los aceros al manganeso) llamados por dicha razón aceros austeníticos.

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Record 3 2000-12-21

English

Subject field(s)
  • Metallurgy - General
  • Materials Engineering
CONT

Duplex stainless steels, consisting of approximately equal amounts of austenite and ferrite, often combine the best features of austenitic and ferritic stainless steels. They generally have good mechanical properties, including high strength and ductility, and the corrosion resistance is often better than conventional austenitic grades. This has lead to a growing use of duplex stainless steels as a material in mechanically loaded constructions. However, detailed knowledge regarding its mechanical properties and deformation mechanisms are still lacking. In this project special emphasis has been placed on the residual stresses and their influence on mechanical behaviour of duplex stainless steels. Due to the difference in coefficient of thermal expansion between the two phases, tensile microstresses are found in the austenitic phase and balancing compressive microstresses in the ferritic phase.

CONT

at elevated temperatures carbon exists in a solid solution with iron; this is the austenitic phase, and the steel would be soft and weak.

OBS

austenite :Gamma iron with carbon in solution.

French

Domaine(s)
  • Métallurgie générale
  • Génie des matériaux
CONT

La caractéristique importante de ces alliages à mémoires de forme est de présenter, à une température donnée en fonction de la composition chimique, une transformation martensitique thermo-élastique. La transformation martensitique est à distinguer d'autres modifications structurelles qu'un matériau peut subir, par exemple la précipitation, la diffusion ou l'oxydation. C'est en référence aux aciers que l'on appelle phase austénitique, la phase-mère à haute température et phase martensitique, la phase issue de la transformation martensitique.

CONT

Outre l'effet mémoire de forme, la transformation martensitique est également responsable de l'effet dit superélastique. L'effet superélastique se traduit par l'induction de martensite sous contrainte, à une température telle que l'on se trouve en phase austénitique, entraînant une déformation du matériau pouvant aller jusqu'à 10 % pour des monocristaux. Au cours de la décharge, la martensite précédemment induite va se retransformer en austénite et l'échantillon retrouve sa forme initiale.

Spanish

Save record 3

Record 4 1999-10-13

English

Subject field(s)
  • Heat Treatment: Intervening Factors (Metals)
OBS

recalescence : Brightening(reglowing) of iron on cooling through the gamma to alpha-phase transformation temperature caused by liberation of the latent heat of transformation.

French

Domaine(s)
  • Traitement thermique des métaux (Facteurs)
OBS

recalescence : anomalie de la loi de refroidissement se traduisant par une remontée de la température et due au dégagement de chaleur accompagnant la transformation de gamma à alpha.

Spanish

Save record 4

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