annealing

annealing
Treatment of a metal, alloy, or other material by heating to a predetermined temperature, holding for a certain time, and then cooling to room temperature, done to improve ductility and reduce brittleness.

Process annealing is carried out intermittently during the working of a piece of metal to restore ductility lost through repeated hammering or other working, if several cold-forming operations are required but the metal is so hardened after the first operation that further cold working would cause cracking (see hardening). Full annealing is done to give workability to such parts as forged blanks destined for use in the machine-tool industry. Annealing is also done for relief of internal stresses in metal and glass. Annealing temperatures and times differ for different materials and with properties desired; steel is usually held for several hours at about 1,260°F (680°C) and then cooled for several hours. See also heat treating, solid solution.

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      treatment of a metal or alloy by heating to a predetermined temperature, holding for a certain time, and then cooling to room temperature to improve ductility and reduce brittleness. Process annealing is carried out intermittently during the working of a piece of metal to restore ductility lost through repeated hammering or other working. Full annealing is done to give workability to such parts as forged blanks destined for use in the machine-tool industry. Annealing is also done for relief of internal stresses. Annealing temperatures vary with metals and alloys and with properties desired but must be within a range that prevents the growth of crystals.

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  • Annealing — may refer to: *Annealing (metallurgy), a heat treatment that alters the microstructure of a material causing changes in properties such as strength and hardness *Annealing (glass), heating a piece of glass to remove stress *Annealing (biology),… …   Wikipedia

  • Annealing — An*neal ing, n. 1. The process used to render glass, iron, etc., less brittle, performed by allowing them to cool very gradually from a high heat. [1913 Webster] 2. The burning of metallic colors into glass, earthenware, etc. [1913 Webster] …   The Collaborative International Dictionary of English

  • annealing — annealing. См. отжиг. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

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

  • annealing —  Annealing  Отжиг   Термический процесс, использующийся для снятия напряжений, кристаллизации или придания покрытию большей однородности.  ♣ Гидрофильная часть  ♣ Гидрофильная часть  ♣ Гидрофобная часть …   Толковый англо-русский словарь по нанотехнологии. - М.

  • annealing — a process involving heating and cooling designed to effect: (1) softening of a cold worked structure by re crystallization of grain growth or both; (2) softening of an age hardened alloy by causing a nearly complete precipitation of the second… …   Mechanics glossary

  • Annealing — Der englischsprachige Begriff Annealing (dt. ausheilen, glühen) steht: in der Genetik für primer annealing als Synonym für die Primerhybridisierung in der Werkstoffbearbeitung (vor allem in der Halbleitertechnologie) für das Ausheizen/Ausheilen… …   Deutsch Wikipedia

  • Annealing — Anneal An*neal , v. t. [imp. & p. p. {Annealed}; p. pr. & vb. n. {Annealing}.] [OE. anelen to heat, burn, AS. an?lan; an on + ?lan to burn; also OE. anelen to enamel, prob. influenced by OF. neeler, nieler, to put a black enamel on gold or silver …   The Collaborative International Dictionary of English

  • annealing — (1) Toughening upon slow cooling. (2) Used in the context of DNA renaturation after temperature dissociation of the two strands. Rate of annealing is a function of complementarity. (3) Fusion of microtubules or microfilaments end to end …   Dictionary of molecular biology

  • annealing — noun The act of heating solid metal or glass to high temperatures and cooling it slowly so that its particles arrange into a defined lattice. Without annealing, the quality of our metal products will diminish …   Wiktionary

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