lab3 - MICROSTRUCTURE OF MATERIALS OBJECTIVE The aim of...

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MICROSTRUCTURE OF MATERIALS OBJECTIVE The aim of this experiment is to observe the change in microstructures of ferrous alloys with different cooling rates, carbon contents and plastic deformation.The microstructures of some nonferrous alloys will also be examined. APPARATUS - Sectioning machine - Mounting machine - Emery papers - Polishing machine - Etching Reagent (2% Nital) - Optical Microscope SPECIMENS 1. AISI 1020 steel specimen. Furnace cooled. 2. AISI 1060 steel specimens. Furnace cooled, air cooled, quenched in water / oil, 3. Brass specimen. 4. Plastically deformed steel specimen. 5. Tool steel (H13) specimen. SPECIMEN NO Steel Grade Processing Route 1 AISI 1060 Furnace Cooling 2 AISI 1060 Air Cooling 3 AISI 1060 Water Quenching 4 AISI 1060 Oil Quenching 5 AISI 1020 Furnace Cooling 6 AISI H13 Air Cooling 7 Brass Annealed 8 Steel Cold Deformation
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In this part of my report I want to make a brief explanation about the results of the experiment (observations of the microscopy results) and, I want to show the microstructures of the specimens ,moreover I compare the structures a little bit and also I try to answer the questions part. SPECIMENS AND MICROSTRUCTURES NOTE: You can find the drawing of microstructures in the drawings page totally. AISI 1060 FURNACE COOLED In furnace cooling the cooling rate is very small .In this situation we can say the equilibrium conditions are satisfied. So we can use the equilibrium iron-carbon phase diagram to find out the microstructure of the material.We observe proeutectoid ferrite and pearlite(eutectoid ferrite and cementite).pearlite has a plate like structure and it is a coarse pearlite due to the diffusion rate of carbon atoms. AISI 1060 AIR COOLED The cooling rate of air cooling is faster than the furnace cooling. Proeutectoid ferrite and pearlite are present in its microstructure.It is like the previous one but due the different cooling rate there are some differences.The grains are finer in this case,proeutectoid ferrite grains are not equiaxed,the pearlite is much finer.As we can see the cooling rate has an important effect in microstructural changes. AISI 1060 WATER QUENCHED
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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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lab3 - MICROSTRUCTURE OF MATERIALS OBJECTIVE The aim of...

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