MetE 206 Exp2 - Met.E 206 Materials Laboratory Experiment...

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Met.E 206 Materials Laboratory Experiment II Property Control By Heat Treatment Tahir Mahmut Beydola 1394014
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Introduction Heat treatment is used to change the metals’ and alloys’ mechanical properties such as strength and hardness for their usage areas. In this lab session we observed how rapid or slow cooling affects the hardness of the steel. Also, we observed how the change in carbon concentration affects the hardness. We cannot produce martensite with furnace and air cooling because of the slow cooling rates. When cooled slowly, phases of steel are dictated by equilibrium phase diagrams and mechanical properties are a function of only carbon content. On the other hand, when fast cooling rates are applied TTT (time-temperature- transformation) diagrams are necessary. In equilibrium, high temperature phases can not exist at room temperature while in fast cooling high temperature microstructure can be frozen and observed at room temperature. Also, a completely new phase, which is not present in equilibrium diagram, can appear. This new phase is called martensite and it gives hardness to ferrous alloys.
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