Heat treatment is a method used to alter the physical and sometimes chemical properties of a material. The most common application is metallurgical .Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve a desired result such as hardening or softening of a material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering and quenching. It is noteworthy that while the term heat treatment applies only to processes where the heating and cooling are done for the specific purpose of altering properties intentionally, heating and cooling often occur incidentally during other manufacturing processes such as hot forming or welding
Techniques Involve In Heat Treatment
Annealing
Tempering
Quenching
Normalizing
Stress Relieving
Spherodizing
ANNEALING
Annealing, process of heat treatment by which glass and certain metals and alloys are rendered less brittle and more resistant to fracture. Annealing minimizes internal defects in the atomic structure of the material and leaves it free from internal stresses that might otherwise be present because of prior processing steps.
Ferrous metals and glass are annealed by heating them to high temperatures and cooling them slowly; copper and silver, however, are best annealed by heating and cooling quickly, then immersing in water.
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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