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Hardening means making a material, particularly a metal, physically harder, and includes particular cases such as: * Hardening (metallurgy), the strengthening of metal alloys by heat treatment * Case hardening, the process of hardening the surface of a metal by infusing elements into the material's surface forming a thin layer of a harder alloy * * Case hardening of rocks * * Case hardening (woodworking) * Air-hardening steel * Cryogenic hardening * Differential hardening * Diffusion hardening * Fire hardening * Induction hardening * Laser hardening * Precipitation hardening * Quenching * Shock hardening * Work hardening, also called strain hardening or cold working * * Strain hardening exponent, a materials constant used in calculations regarding work hardening It also has the metaphorical meaning of making something more resistant to some threat: * Hardening (botany) or cold hardening, the process by which a plant survives freezing temperatures * Hardening (computing), the process of securing a system * Intellectual property hardening * Target hardening, making a military or civilian installation resistant to armed attack * Radiation hardening, making a component or installation resistant to ionizing radiation * g-hardening, protection of something against high g-force due to acceleration * Windows Service Hardening, protection of Microsoft Windows services It may also mean: * Absorption hardening, in nuclear engineering, an increase in the average energy of neutrons by absorption of those of lower energy * Hardening of the arteries * a synonym for sclerotization occurring in arthropods ==See also== * Harden (disambiguation) * Hardness 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hardening」の詳細全文を読む スポンサード リンク
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