Sorbite


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Sorbite

 

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.

REFERENCES

Guliaev, A. P. Termicheskaia obrabotka stali, 2nd ed. Moscow, 1960.
Bunin, K. P., and A. A. Baranov. Metallografiia. Moscow, 1970.
References in periodicals archive ?
As ethers of sorbitan and fatty acids are obtained at high temperatures (up to 245[degrees]C) in the presence of complex catalytic systems [5], in industrial product along with sorbitan monooleate can be found di-, three-, tetra-oleates of sorbitan, sorbite, oleic acid and products of their oxidation.
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.
In thermally treated material the deformation scale decreases (owing to the higher ultimate strength and yielding point), whereas saturation with oxygen increases in the volumes of local, close to the surface materials due to the repeated overstrain of a ferrite component of sorbite mixture and higher temperature at the contact.