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Definitions

Century Dictionary and Cyclopedia

  1. n. The process or art of treating substances by means of heat, so as to remove their brittleness and at the same time render them tough and more or less elastic. In general, these results are obtained by heating to a high temperature and then cooling very gradually. All glassware, china, etc., which is to be subjected to great changes of temperature should be thus treated. The working of iron and steel by hammering, bending, rolling, drawing, etc., tends to harden them and make them brittle, and the original properties are restored by annealing. Steel plates and dies for bank-note printing and the like are annealed in a close box with iron filings or turnings, lime, or other substances, and are thus freed from carbon and reduced to pure soft iron, in which state they will readily take, under pressure, the finest engraving from a hardened plate or die. They are then hardened again to the degree necessary for their use in printing. Steel for engraving dies is commonly annealed by heating it to a bright cherry-red color, and cooling it gradually in a bed of charcoal.
  2. n. Same as tempering.
  3. n. A founders' term for the slow treatment of the clay or loam cores for castings, which, after having been dried, are burned or baked, and then are slowly cooled.

Wiktionary

  1. n. The act of heating solid metal or glass to high temperatures and cooling it slowly so that its particles arrange into a defined lattice.
  2. v. present participle of anneal.

GNU Webster's 1913

  1. n. The process used to render glass, iron, etc., less brittle, performed by allowing them to cool very gradually from a high heat.
  2. n. The burning of metallic colors into glass, earthenware, etc.

WordNet 3.0

  1. n. hardening something by heat treatment

Examples

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Comments

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  • sionnach Of course, annealing could also refer to the state of a glazier when working by the glory hole. Or altar boys. Nov 9, 2007

  • reesetee Atoms as salespeople. I'll never see them the same way again. ;-) Nov 9, 2007

  • seanahan I actually studied simulated annealing in class today, funny coincidence. Nov 9, 2007

  • sionnach I just like the image of the atoms wandering randomly, like Odysseus, through "states of higher energy". Just like the traveling salesman wandering forlornly from city to city, in search of the elusive global optimum. Nov 8, 2007

  • reesetee Good heavens, sionnach. Now I'll never confuse the two. Nov 8, 2007

  • sionnach Not to be confused with simulated annealing:

    Simulated annealing (SA) is a generic probabilistic meta-algorithm for the global optimization problem, namely locating a good approximation to the global optimum of a given function in a large search space. It is often used when the search space is discrete (e.g., all tours that visit a given set of cities). In favorable cases, simulated annealing may be more effective than exhaustive enumeration of the search space.

    The name and inspiration come from annealing in metallurgy, a technique involving heating and controlled cooling of a material to increase the size of its crystals and reduce their defects. The heat causes the atoms to become unstuck from their initial positions (a local minimum of the internal energy) and wander randomly through states of higher energy; the slow cooling gives them more chances of finding configurations with lower internal energy than the initial one. Nov 8, 2007

  • reesetee The process of slowly cooling a completed glass object in an auxiliary part of the glass furnace or in a separate furnace. If a hot glass object is allowed to cool too quickly, it will be highly strained by the time it reaches room temperature and may break from the strain. Nov 8, 2007

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