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A hard, brittle iron carbide present in cast iron and most steels.
- ‘The harder pearlite is comprised of alternating thin layers or shells of ferrite and cementite, a very hard substance.’
- ‘This cementite is hard (Brinell hardness 600 +), brittle and brilliantly white.’
- ‘Fig.8 shows the structure of a steel hardened from 760°C, consisting of particles of cementite dispersed in a matrix of martensite.’
- ‘The equilibrium diagram does not tell us what form is taken by the ferrite or cementite ejected from the austenite on cooling.’
- ‘It has been shown how the difference in solubility of carbon in austenite and ferrite leads to the familiar ferrite / cementite aggregates in plain carbon steels.’
Late 19th century: from cement + -ite.
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