Lab_Report_III(Aykut) - METU Department of Metallurgical...

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METU Department of Metallurgical and Materials Engineering Met E 206 Materials Laboratory Experiment III MICROSTRUCTURE OF MATERIALS By Prof. Dr. Bilgehan ÖGEL Assistant: Tarık Aydoğmuş Prepared by: Alp Aykut KİBAR 1346709
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MICROSTRUCTURE OF MATERIALS OBJECTIVE Metallography is one of the most important branch of physical metallurgy. It is concerned with the microstructures of metallic materials. Metallography is used in observing and interpreting the microstructures by using some imaging techniques like optical and electron microscopy. Many mechanical properties, chemical composition and processing technique of an alloy can be obtained by making some metallographic observations. In this experiment, our aim is to observe the effect of these properties on the microstucture of the materials. In detail, we are going to observe the changes in microstructure between the materials which is objected to different cooling rates, welding operations and plastic deformations and also between the materials that has different compositions and some alloys. With these microstructures we can guess many mechanical properties such as hardness and strenght. APPARATUS - Sectioning machine - Mounting machine - Emery papers - Polishing machine - Etching Reagent (2% Nital) - Optical Microscope SPECIMENS Specimen No Steel Grade Processing Route 1 AISI 1060 Furnace Cooling 2 AISI 1060 Air Cooling 3 AISI 1060 Water Quenching 4 AISI 1020 Furnace Cooling 5 Brass 6 Low Carbon Steel Cold Deformation 7 Welded Specimen
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RESULTS AND DISCUSSION SPECIMENS AND MICROSTRUCTURES AISI 1020 ANNEALED MICROSTRUCTURE Because annealed steel has a very low cooling rate, it is assumed that there is enough time to satisfy the equilibrium conditions. So we can use the equilibrium iron-carbon phase diagram, then we have the proeutectoid ferrite and pearlite forms in the microstructure as we observe from the microscope in our experiment. AISI 1060 ANNEALED Just as the AISI 1020 steel, this steel has the the equilibrium conditions due to slow cooling too. Also it has proeutectoid ferrite and pearlite structures like 1020 steel, but their difference is in the amount of the pearlite. Because 1060 steel has more carbon content, it has
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This note was uploaded on 12/27/2011 for the course MATH 265 taught by Professor Asas during the Spring '11 term at Middle East Technical University.

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Lab_Report_III(Aykut) - METU Department of Metallurgical...

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