Metallic, non-magnetic allotrope of iron or a solid solution of iron, with an alloying element
Not to be confused with Austinite.
This article is about the alloy and iron allotrope. For Jane Austen fans, see Janeite.
Steels
Phases
Ferrite
Austenite
Cementite
Martensite
Graphite
Microstructures
Spheroidite
Pearlite
Bainite
Ledeburite
Tempered martensite
Widmanstätten structures
Classes
Crucible steel
Carbon steel
Spring steel
Alloy steel
Maraging steel
Stainless steel
High-speed steel
Weathering steel
Tool steel
Other iron-based materials
Cast iron
Gray iron
White iron
Ductile iron
Malleable iron
Wrought iron
Iron-carbon phase diagram, showing the conditions under which austenite (γ) is stable in carbon steel.Allotropes of iron; alpha iron and gamma iron
Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron with an alloying element.[1] In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1000 K (727 °C); other alloys of steel have different eutectoid temperatures. The austenite allotrope is named after Sir William Chandler Roberts-Austen (1843–1902).[2] It exists at room temperature in some stainless steels due to the presence of nickel stabilizing the austenite at lower temperatures.
^Reed-Hill R, Abbaschian R (1991). Physical Metallurgy Principles (3rd ed.). Boston: PWS-Kent Publishing. ISBN 978-0-534-92173-6.
^Gove PB, ed. (1963). Webster's Seventh New Collegiate Dictionary. Springfield, Massachusetts, USA: G & C Merriam Company. p. 58.
Austenite, also known as gamma-phase iron (γ-Fe), is a metallic, non-magnetic allotrope of iron or a solid solution of iron with an alloying element....
temperatures associated to the austenite-to-martensite and martensite-to-austenite transformations. Starting from full austenite, martensite begins to form...
quenching steel causes the austenite to transform into martensite, all of the austenite usually does not transform. Some austenite crystals will remain unchanged...
Martensite is formed in carbon steels by the rapid cooling (quenching) of the austenite form of iron at such a high rate that carbon atoms do not have time to...
strength and vice versa. Iron has a higher solubility for carbon in the austenite phase; therefore all heat treatments, except spheroidizing and process...
stabilize amounts of austenite at room temperature in normally austenite-free low-alloy ferritic steels. By applying strain, the austenite undergoes a phase...
after quenching them from the high temperature austenite phase or they can contain retained austenite. The latter effect enables the design of maraging-TRIP...
Davenport and Edgar Bain, it is one of the products that may form when austenite (the face-centered cubic crystal structure of iron) is cooled past a temperature...
and cast iron (at the composition of 4.3% carbon in iron producing an austenite-cementite eutectic) Silicon chips are eutectic bonded to gold-plated substrates...
of white cast iron. In carbon steel, cementite precipitates from austenite as austenite transforms to ferrite on slow cooling, or from martensite during...
ledeburite is a mixture of 4.3% carbon in iron and is a eutectic mixture of austenite and cementite. Ledeburite is not a type of steel as the carbon level is...
oil to room temperature. The steel is then tempered. In this process, austenite is transformed to martensite by step quenching, at a rate fast enough...
cooling of an iron-carbon alloy, pearlite forms by a eutectoid reaction as austenite cools below 723 °C (1,333 °F) (the eutectoid temperature). Pearlite is...
duplex and precipitation hardened). Its primary crystalline structure is austenite (face-centered cubic) and it prevents steels from being hardenable by...
depending on temperature: alpha iron (α-Fe, ferrite), gamma iron (γ-Fe, austenite), and delta iron (δ-Fe). At very high pressure, a fourth form exists,...
strength and ductility. TRIP steels possess a microstructure consisting of austenite with sufficient thermodynamic instability such that transformation to...
steels along grain boundaries. This inhibits the γ-α transformations (austenite to ferrite transformation) by diffusion and therefore increases the hardenability...
depending on grade. The resulting austenite has a face-centered cubic crystal structure. Quenching. The austenite is transformed into martensite, a hard...
their composition and prior heat treatment are such that they retain some austenite at room temperature. It is designed to increase the amount of martensite...
grades because their metallurgical structure consists of two phases, austenite (face-centered cubic lattice) and ferrite (body centered cubic lattice)...
lowercase gamma with a dot above it: γ ˙ {\displaystyle {\dot {\gamma }}} Austenite (also known as γ-iron), a metallic non-magnetic allotrope or solid solution...
of 0.7% is heated beyond 750 °C (1,380 °F), it enters the austenite phase. When austenite is cooled very suddenly by quenching in water, the structure...
ductility. At around 10% manganese content the steel will remain in its austenite form at room temperature if cooled correctly. Both hardness and ductility...
include cooling a liquid to form an amorphous solid, and cooling eutectoid austenite to form martensite. In biology, normal adult bones possess a lamellar...
studied as a possible nodulizer. Austempered ductile iron (ADI; i.e., austenite tempered) was discovered in the 1950s but was commercialized and achieved...
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