from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Pearlite.
from the GNU version of the Collaborative International Dictionary of English
- n. A sugarlike substance, isomeric with mannite and dulcite, found with sorbin in the ripe berries of the sorb, and extracted as a sirup or a white crystalline substance.
from The Century Dictionary and Cyclopedia
- n. A crystalline principle (C6H14O6) isomeric with mannite: found in mountain-ash berries. It does not ferment with yeast or reduce copper solutions.
- n. A constituent of steel; practically pearlite which has not had time to become perfectly formed. The solid solution of carbon in iron (austenite) will decompose into pearlite, together with either excess ferrite or excess cementite, according as the percentage of carbon is less or more than 0.90 per cent. The complete decomposition of the austenite requires time, and there is therefore very frequently only a partial resolution into pearlite. The transition-forms between the austenite and pearlite are called respectively martensite, troostite, and sorbite. Present knowledge does not disclose fully the nature of these transition-forms.
This toughness is the chief characteristic of the next material in the transformation series, sorbite, which is merely martensite wholly transformed into
In the ordinary practice of hardening steels, the quenching is not so drastic, and the transformation of austenite back to ferrite and cementite is more or less completely effected, giving rise to certain transitory forms which are known as "martensite," "troostite," "sorbite," and finally, pearlite.
Troostite is of doubtful composition, but possibly is an unstable mixture of untransformed martensite with sorbite.