An acicular aggregate of ferrite and carbide particles formed when austenite is transformed on cooling at temperatures in the intermediate (200-450°C) range, i.e. above the martensite and below the pearlite range.
A two-phase microconstituant, containing a fine needle-like microstructure of ferrite and cementite, that forms in steels that are isothermally transformed at relatively low temperatures.
An intermediate transformation product from austenite in the heat treatment of steel. Bainite can somewhat resemble pearlite or martensite, depending on the transformation temperature.
A steel constituent made of a mixture of fine iron carbides precipitated in a mass of plate-shaped ferrite.
The product of the final transformation of austenite decomposition.
A metastable aggregate of ferrite and cementite resulting from the transformation of austenite at temperatures below the pearlite range but above the martensite start temperature. Bainite formed in the upper part of the bainite transformation range has a feathery appearance; bainite formed in the lower part of the range has an acicular appearance resembling that of tempered martensite.
a Fe-C composition consisting of a fine dispersion of cementite in alpha- ferrite. It is an austenitic transformation product that forms at temperatures between those at which pearlite and martensite transformations occur.
A decomposition product of austenite consisting of an aggregate of ferrite and carbide. In general, it forms at temperatures lower than those where very fine pearlite forms, and higher than those where martensite begins to form on cooling.
In steel, an acicular aggregate of ferrite and carbide, resulting from an isothermal transformation of austenite at a temperature below the pearlitic range and above Ms. See Austenite.
Material structure. Characteristics: hardness, distortion and dimensional stability lower, strength higher than martensite
Bainite is a mostly metallic substance that exists in steel after certain heat treatments. First described by Davenport E. S. and Edgar Bain, it forms when austenite (a solution of carbon in iron) is rapidly cooled past a critical temperature of 1333°F (about 723°C).
