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mfgprop - ITU Department of Mechanical Engineering...

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ITU Department of Mechanical Engineering MANUFACTURING PROPERTIES of ENGINEERING MATERIALS Lecture Notes Prof.Dr.Ahmet Aran 2007
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AHMET ARAN - MFG PROP V1 1 CONTENTS 1. Engineering Materials and Their Properties 1.1. Classification of Engineering Materials 1.2. Properties of Engineering Materials 1.2.1. Mechanical Properties 1.2.2. Thermal Properties 1.2.3. Environmental Properties 1.2.4. Electrical Properties 2. Manufacturing Processes and Manufacturability 2.1 Casting and Castability 2.1.1. Casting Process: 2.1.2. Castability: 2.1.3. Material Properties Which Affect Castability 2.2. Bulk Forming 2.2.1.Rolling 2.2.2.Forging 2.2.3.Extrusion 2.2.5.Material Properties Which Effect Formability 2.3. Sheet Metal Forming 2.4. Machining 2.5. Joining 2.6. Other Processes
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AHMET ARAN - MFG PROP V1 2 1. Engineering Materials and Their Properties In this Chapter materials are classified and the most important properties of the engineering materials are listed with short explanations. The properties covered here are especially those properties, which are important in manufacturing processes. 1.1. Classification of Engineering Materials A. Metals and Alloys: Inorganic materials composed of one or more metallic elements. head2right They usually have a crystalline structure and are good thermal and electrical conductors. head2right Many metals have high strength and high elastic module. head2right They maintain their good strength at high and low temperatures. head2right They also have sufficient ductility, which is important for many engineering applications. head2right They can be strengthened by alloying and heat treatment. head2right They are least resistant to corrosion. B. Ceramics and Glasses: Inorganic materials consisting of both metallic and non- metallic elements bonded together chemically. head2right They can be crystalline (ceramics), non-crystalline (glasses) or mixture of both (glass-ceramics). head2right Generally they have high melting points and high chemical stabilities. head2right They have high hardness, high moduli and high temperature strength. head2right But since they are very brittle they cannot be used as good as metals. head2right Ceramics are usually poor electrical conductors. head2right Ceramics have a high strength on compression C. Polymers: Organic materials which consist of long molecular chains or networks containing carbon. head2right Most polymers are non-crystalline, but some consist of mixtures of both crystalline and non-crystalline regions. head2right They generally have low densities and low rigidity. head2right Their mechanical properties may vary considerably. head2right Most polymers are poor electrical conductors due to the nature of the atomic bonding. head2right Most of them are corrosion resistant, but cannot be used at high temperatures.
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