Factors affecting materials properties:
The following are the more important factors which can be influence the properties and performance of engineering materials.
1. Heat treatment
This is the controlled heating and cooling of metals to change their properties to improve their performance or to facilitate processing. An example of heat treatment is the hardening of a piece of high carbon steel rod. If it is heated to and plunged into cold water to cool it rapidly (quenching), it will become hard and brittle. If it is again heated but allowed to cold very slowly it will become softer and less brittle (more tough). In this condition it is said to be annealed.
After the heat treatment happened on the material it will be in its best condition for flow forming, during flow forming (working) the grains will be distorted and this will result in most metals becoming work hardened if flow formed at room temperature. To remove any locked in stresses resulting from the forming operations and to prepare the material for machining, the material has to be normalized.
2. Processing
Hot –and cold working process will be referred to understand what is meant by terms hot and cold working as applied to metals. Metal is hot worked or cold worked depending upon the temperature at which it is flow formed to shape . These temperatures are not easy to define for instance , lead hot works at room
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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