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proeutectoid cementite

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Materjalitehnika terminibaas

ID 673355 Last modified 28.08.2025
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Domain materials sciencemetallographycasting
  • jahtumisel allpool Acm (1147 - 727 oC) austeniidist välja sadestuv tsementiit, mis esineb üleeutektoidteraste struktuuris perliidi kõrval (vt tsementiit, vaba tsementiit, austeniit, perliit, üleeutektoidteras; vrd primaartsementiit, tertsiaartsementiit)
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    • On tingitud süsiniku austeniidis lahustuvuse vähenemisest jahtumisel. Eeleutektoidtsementiit esineb rauasüsinikusulamite struktuuris struktuurselt vaba tsementiidina st tsementiidina mis ei ole perliidi koostises (vt austeniit, tsementiit, perliit, vaba tsementiit)
  • cementite precipitating from austenite upon cooling below Acm (1147 - 727 oC) and exists in addition to pearlite in hypereutectoid steels (see: cementite, free cementite, austenite, pearlite, hypereutectoid steel; compare: primary cementite, tertiary cementite)
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    • This is a result of decrease of the carbon solubility in austenite upon cooling. Proeutectoid cementite is a separate, structurally free constituent in iron-carbon alloys i.e. not in association with cementite in pearlite. (see: austenite, cementite, pearlite, free cementite)
sekundaartsementiit preferred
eeleutektoidtsementiit
eeleutektoidne tsementiit
secondary cementite preferred
proeutectoid cementite
proeutectoid carbide
hypereutectoid cementite deprecated

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