Search results
Results from the WOW.Com Content Network
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 α + γ phase field is, technically, the β + γ field above the A 2. The beta designation maintains continuity of the Greek-letter progression of phases in iron and steel: α-Fe, β-Fe, austenite (γ-Fe), high-temperature δ-Fe, and high-pressure hexaferrum (ε-Fe). Molar volume vs. pressure for α-Fe at room temperature.
Austenite and the higher temperature phases of steel were becoming more and more understood and it was already known that austenite could be retained at room temperature. Through his contacts at the American Steel and Wire Company, Bain was aware of isothermal transformations being used in industry and he began to conceive new experiments [ 1 ]
Austenite is gamma-phase iron (γ-Fe), a solid solution of iron and alloying elements. As a result of the quenching, the face-centered cubic austenite transforms to a highly strained body-centered tetragonal form called martensite that is supersaturated with carbon. The shear deformations that result produce a large number of dislocations ...
Its primary crystalline structure is austenite (face-centered cubic). ... Duplex stainless steel – Stainless steel that has both austenitic and ferritic phases;
Duplex stainless is widely used in the industry because it possesses excellent oxidation resistance but can have limited toughness due to its large ferritic grain size, and they have hardened, and embrittlement tendencies at temperatures ranging from 280 to 500 °C, especially at 475 °C, where spinodal decomposition of the supersaturated solid ...
SMAs can exist in two different phases, with three different crystal structures (i.e. twinned martensite, detwinned martensite, and austenite) and six possible transformations. [5] [6] The thermo-mechanic behavior of the SMAs is governed by a phase transformation between the austenite and the martensite.
However, as carbon is added, becoming steel, the A 2 temperature splits into the A 3 temperature, also called the austenizing temperature (all phases become austenite, a solution of gamma iron and carbon) and its A 1 temperature (austenite changes into pearlite upon cooling). Between these upper and lower temperatures the pro eutectoid phase ...