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a structural component of steel and cast iron; a highly dispersed variety of pearlite, namely, a eutectoid mixture of ferrite and cementite.

Troostite was named in honor of the French scientist L. J. Troost (1825–1911). It is formed as a result of the decomposition of austenite at temperatures below 600°C. The interlaminar distance in troostite is less than 0.1 micrometer. Troostite is harder than either pearlite or sorbite. The laminar structure of troostite, with a fan-shaped arrangement of the layers, may be observed using electron microscopy. Dark segments of troostite on a background of light fields of martensite are visible under an optical microscope.


Guliaev, A. P. Termicheskaia obrabotka stali, 2nd ed. Moscow, 1960.
Bunin, K. P., and A. A. Baranov. Metallografia. Moscow, 1970.
References in periodicals archive ?
Fine ferrite precipitates are recorded at the grain boundaries, and the grain itself has a troostite structure.
5a shows that the structure of the steel after tempering is composed of fine troostite.
Presence of all structures of disintegration austenite (pearlite, sorbite, troostite and martensite) in the changed structural condition speaks that this disintegration was preceded with the certain temperature of heating and the speed of cooling caused transformation pearlite in austenite, and then return process of transition of the last in pearlite.