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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 ?
Corresponding to the annealed state, the structure was formed of polyhedral ferrite and pearlite grains in approximately equal quantities, and in the case of the hardened state the structure consisted of tempering sorbite.
The metal in all sections of the weld zone consisted of the fine-dispersion homogeneous structure of tempered sorbite with the grain size corresponding to grain size number 11-13.
Consequently, the metal surface becomes sorbitic pearlite or sorbite of 290/320 HB hardness in the depth of 8 mm from the roll surface.