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in physical metallurgy, a structural component of steels and cast irons. It is a dispersed variety of pearlite, which is a eutectic mixture of ferrite and cementite.

Sorbite was named in honor of the English scientist H. C. Sorby (1826–1908). It is formed as a result of the decomposition of austenite at a temperature of approximately 650°C. The distance between the lamellae in sorbite is 0.2 micrometer, whereas in pearlite it is 0.5–1.0 micrometer. The hardness, strength, and impact strength of sorbite are greater than those of pearlite. The ferrite-carbide mixture formed as a result of hardening and high-temperature tempering is sometimes called tempered sorbite.


Guliaev, A. P. Termicheskaia obrabotka stali, 2nd ed. Moscow, 1960.
Bunin, K. P., and A. A. Baranov. Metallografiia. Moscow, 1970.
References in periodicals archive ?
By means of two half-coil inductors powered by one generator for each wheelset, one for each wheel, the wheels are processed by multi-pulse heating, chilling and cooling in the same way as in the well-known method, which enables to get the structure of sorbitic pearlite or sorbite of 290+320 HB hardness in an agreeable depth from the roll surface evenly distributed along the length of the profile.
Microstructure of steel after heat treatment for hardness (HB 269-255) represents tempering sorbite (Figure 4) that stipulates high values of toughness and plastic properties of the steel.
2, is observed in annealed carbon and alloy structural steels with the structure of ferrite, ferrite-pearlite and finely dispersed sorbite.