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In Conclusion this experiment demonstrates how heat treating methods and environmental temperature affects steel’s mechanical properties. The data from the first part of the experiment showed that the yield strength, toughness, and ductility of a sample varies greatly with the microstructure caused by the type of heat treatment. The SEM showed how ductile and brittle samples had different microstructures at the point of fracture making them easily identifiable. Ductile samples tended to have more toughness but also had less strength than brittle samples. Through the tensile test engineers can more precisely control the mechanical properties of the materials they use in their designs. This allows the parts to be made to behave in a much more predictable and desirable manner.
The second part of this experiment demonstrates how steel has drastically different mechanical properties under differing temperatures when compared to when its properties at room temperature; behaving in a more ductile or brittle manner in warmer or colder temperatures respectively. This is important for engineers who are designing systems that need to work under extreme conditions (i.e.: working in arctic, designing components for a jet engine). Designers that are informed about the transition temperatures of alloys will be able to choose the best metal alloy to operate under the temperatures the part is likely to experience.
Error in this test was not significant enough to alter the results of this experiment. The calculated Young’s modulus from the tensile test was fairly similar to the value calculated with the Buzz-O-Sonic indicating that the overall error was fairly low. The data point that does not follow the trend in the data is the %EL for the WC 300C sample which appeared higher than the rest of the data would have suggested. It is apparent that this discrepancy can be attributed to error since the error bar on the graph is very large.
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