Studied by 0 people
Looks like no one added any tags here yet for you.
Face-centered cubic iron; also iron and steel alloys that have the FCC crystal structure.
Iron carbide (Fe3C).
A reaction in which, upon cooling, a liquid phase transforms isothermally and reversibly into two intimately mixed solid phases.
A two-phase microstructure resulting from the solidification of a liquid having the eutectic composition; the phases exist as lamellae that alternate with one another.
A reaction in which, upon cooling, one solid phase transforms isothermally and reversibly into two new solid phases that are intimately mixed.
Ferrite (ceramic)
Ceramic oxide materials composed of both divalent and trivalent cations (e.g., Fe21 and Fe31), some of which are ferrimagnetic.
Ferrite (iron)
Body-centered cubic iron; also iron and steel alloys that have the BCC crystal structure.
For an alloy system displaying a eutectoid, an alloy for which the concentration of solute is greater than the eutectoid composition.
Having the same structure. In the phase diagram sense, isomorphicity means having the same crystal structure or complete solid solubility for all compositions.
A mathematical expression by which the relative phase amounts in a two-phase alloy at equilibrium may be computed.
On a binary phase diagram, the line or boundary separating liquid- and liquid + solid-phase regions. For an alloy, the liquidus temperature is the temperature at which a solid phase first forms under conditions of equilibrium cooling.
An element of the microstructure that has an identifiable and characteristic structure. It may consist of more than one phase, such as with pearlite.
A two-phase microstructure found in some steels and cast irons; it results from the transformation of austenite of eutectoid composition and consists of alternating layers (or lamellae) of -ferrite and cementite.
A homogeneous portion of a system that has uniform physical and chemical characteristics.
Primary ferrite that exists in addition to pearlite for hypoeutectoid steels.
Primary cementite that exists in addition to pearlite for hypereutectoid steels.
On a phase diagram, the locus of points at which solidification is complete upon equilibrium cooling, or at which melting begins upon equilibrium heating.
An austenitic transformation product found in some steels and cast irons. It forms at temperatures between those at which pearlite and martensite transformations occur. The microstructure consists of α-ferrite and a fine dispersion of cementite.
Pearlite for which the alternating ferrite and cementite layers are relatively thick.
A plot of temperature versus the logarithm of time for a steel alloy of definite composition. Used to indicate when transformations occur as the initially austenitized material is continuously cooled at a specified rate; in addition, the final microstructure and mechanical characteristics may be predicted.
Pearlite in which the alternating ferrite and cementite layers are relatively thin.
A plot of temperature versus the logarithm of time for a steel alloy of definite composition. Used to determine when transformations begin and end for an isothermal (constanttemperature) heat treatment of a previously austenitized alloy.
The study of reaction rates and the factors that affect them.
A metastable iron phase supersaturated in carbon that is the product of a diffusionless (athermal) transformation from austenite.
Microstructure found in steel alloys consisting of spherelike cementite particles within an -ferrite matrix. It is produced by an appropriate elevated-temperature heat treatment of pearlite, bainite, or martensite, and is relatively soft.
A composite for which both matrix and dispersed phases are ceramic materials. The dispersed phase is normally added to improve fracture toughness.
A composite material consisting of aggregate particles bound together in a solid body by a cement.
For composites and some two-phase alloys, the discontinuous phase surrounded by the matrix phase.
Any polymer, metal, or ceramic that has been drawn into a long and thin filament.
A composite in which the dispersed phase is in the form of a fiber (i.e., a filament that has a large length-to-diameter ratio).
A type of particle-reinforced composite in which particle-matrix interactions cannot be treated on an atomic level; the particles reinforce the matrix phase.
The lengthwise dimension. For a rod or fiber, in the direction of the long axis.
The phase in a composite or two-phase alloy microstructure that is continuous or completely surrounds the other (or dispersed) phase.
A composite material that has a metal or metal alloy as the matrix phase. The dispersed phase may be particulates, fibers, or whiskers, which normally are stiffer, stronger, and/or harder than the matrix.
The properties of a multiphase alloy or composite material are a weighted average (usually on the basis of volume) of the properties of the individual constituents.
The ratio of elastic modulus to specific gravity for a material.
The ratio of tensile strength to specific gravity for a material.
A direction that crosses (usually perpendicularly) the longitudinal or lengthwise direction.
