Option 48
1. What is eutectic? Give an example of an alloy with a structure
eutectic.
2. What explains the hardening of metal during plastic deformation?
3. Draw a state diagram of iron - iron carbide, indicate structural
components in all areas of the diagram, describe the transformations and plot the curve
cooling (using the phase rule) for an alloy containing 1.7% C. What is the structure of this
alloy at room temperature and what is this alloy called?
4. Draw a diagram of the isothermal transformation of austenite h for steel U8.
Apply an isothermal curve on it to ensure hardness S00 HB. Indicate
how this mode is called and what structure is obtained during this processing.
5. Assign the heat treatment mode of carbon structural steel,
used to reduce internal stress, hardness and improve
machinability by cutting. Give a concrete example.