eee_lab_3 - METU Department of Metallurgical and Materials...

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Unformatted text preview: METU Department of Metallurgical and Materials Engineering Met E 206 Materials Laboratory Experiment III MICROSTRUCTURE OF MATERIALS ERDEM MERMER 1447929 Group 10 OBJECTIVE The aim of this experiment is to observe the changes in the microstructures of several ferrous alloys by examining the effects of:- cooling rate- carbon content- plastic deformation. The microstructures of some nonferrous alloys will also be examined. SPECIMENS Steel Grade Processing Route AISI 1060 Furnace Cooling AISI 1060 Air Cooling AISI 1060 Water Quenching AISI 1060 Oil Quenching AISI 1020 Furnace Cooling AISI H13 Air Cooling Brass Annealed Steel Cold Deformed APPARATUS 1- An optical microscope 2- Etching Reagent( 2% Nital) ANSWERS TO QUESTIONS 1- Etching is revealing the microstruture of the material by surface treatment by using an appropriate chemical reagent. We use an acid solution which is 2% Nital for this experiment.In etching , the surface of the material goes into reaction with the acid solution however the high energy regions such as grain boundaries are more reactive than the other regions. As a result of their high energy this regions will go into reaction more than other regions so we observe them easily under microscope becouse of their color since grain boundaries will reflect light at different angles than other regions..As a result etching is very important for us and for our studies becouse we can obtain a clear image under microscope...
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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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eee_lab_3 - METU Department of Metallurgical and Materials...

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