troostite

[troo-stahyt]

noun

1. a microconstituent of hardened and tempered steel, consisting of a very fine aggregate of ferrite and cementite.

troostite

/ ˈtruːstaɪt /

noun

1. a reddish or greyish mineral that is a variety of willemite in which some of the zinc is replaced by manganese

Other Word Forms

• troostitic adjective

Word History and Origins

Origin of troostite¹

1900–05; named after L. J. Troost (died 1911), French chemist; -ite ¹

Word History and Origins

Origin of troostite¹

C19: named after Gerard Troost (died 1850), US geologist

Example Sentences

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.

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Sorbite is softer and tougher than troostite, and is habitually associated with pearlite.

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Troostite is of doubtful composition, but possibly is an unstable mixture of untransformed martensite with sorbite.

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Moderate reheating or annealing changes this structure largely into troostite, which is a partly transformed martensite, possessing much of the hardness of martensite, but with a largely increased toughness and shock resistance.

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