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EXPERIMENT 3 - Vefa Kksal zmen 1394378 MICROSTRUCTURE OF...

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Vefa Köksal Özmen 1394378 MICROSTRUCTURE OF MATERIALS 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)
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ANSWERS TO THE QUESTIONS 1- Etching is necessary for the observation of the microstructure of materials. Because in the etching process, the material will react with the enchants which will cause surface level differences. And by these differences, microstructure of the material can be easily seen and observed under the optical microscope. Nickel is used as an enchant for the single phase brasses in the etching process. 2- Because the specimen is cooled very slowly, it will satisfy the equilibrium conditions and the transformation of the phases will be done according to the equilibrium phase diagram. In the final microstructure coarse pearlite and proeutectoid ferrite will occur.
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