martensite


martensite
Prodotto di trasformazione estremamente duro che si forma nel caso in cui l'acciaio viene raffreddato rapidamente dalla sua temperatura di austenitizzazione (tempra) fino ad una temperatura inferiore ad Mf (solitamente la temperatura ambiente). La martensite deve essere considerata come una soluzione solida sovrassatura di carbonio in un reticolo tetragonale (praticamente un cubico distorto) di ferro. Al microscopio appare con una struttura aciculare. La sua durezza oscilla fra 30 e 68 HRC in funzione del tenore di C.

Glossario di Metallurgia . 2014.

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  • martensite — [ martɛ̃sit ] n. f. • 1903; de Martens, ingénieur all. ♦ Techn. (métall.) Mélange, par solution de carbone et de fer, entrant dans la composition des aciers trempés. Adj. MARTENSITIQUE , 1921 . ● martensite nom féminin (de A. Martens, nom propre) …   Encyclopédie Universelle

  • Martensite — Martensite. См. Мартенсит. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • martensite — [märt′ n zīt΄] n. [after A. Martens (1850 1914), Ger metallurgist] a very hard, brittle, solid solution of iron and carbon or the carbide of iron, Fe3C, into which hot steel turns when suddenly chilled by cold water martensitic [mär′tən zit′ik]… …   English World dictionary

  • Martensite — For the transformation, see Diffusionless transformations. Iron alloy phases Ferrite (α iron, δ iron) A …   Wikipedia

  • Martensite —  Ne pas confondre avec la martinsite synonyme de halite Cet article est lié aux composés d …   Wikipédia en Français

  • martensite — a metastable iron phase supersaturated in carbon that is the product of a diffusionless (athermal) transformation from austenite. Very rapid cooling (quenching) of steel (at about 1,000(C per minute) produces a new microstructure, martensite. It… …   Mechanics glossary

  • martensite — martensitas statusas T sritis chemija apibrėžtis Persotintas anglies tirpalas α geležyje. atitikmenys: angl. martensite rus. мартенсит …   Chemijos terminų aiškinamasis žodynas

  • martensite — noun Etymology: Adolf Martens died 1914 German metallurgist Date: 1898 the hard constituent that is the chief component of quenched steel • martensitic adjective • martensitically adverb …   New Collegiate Dictionary

  • martensite — martensitic /mahr tn zit ik/, adj. /mahr tn zuyt /, n. Metall. a metastable microconstituent of any of various forms of carbon steel, produced by undercooling sufficiently below the normal transformation temperature, esp. a hard, brittle product… …   Universalium

  • martensite — noun a) A solid solution of carbon in iron; the chief constituent of steel b) Any crystal structure formed by a martensitic transition See Also: martempering …   Wiktionary