Option 50
1. Which of the common metals have a hexagonal type of crystalline
Lattice? Draw an elementary cell and specify its parameters.
2. A tin foil was obtained by rolling at room temperature. Hardness
Tin during rolling remained unchanged. Explain what processes are followed
Deformation of tin at room temperature and how this changes its structure and
Properties.
3. Draw a diagram of the iron-iron carbide state, indicate the structural
Components in all areas of the diagram, describe the transformations and construct a curve
Cooling (using the phase rule) for an alloy containing 2.5% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. Using the iron-cementite state diagram, describe the structural
Transformations occurring upon heating of steel U11. Specify critical points and assign
Temperature of heating of this steel for quenching and normalization. Describe these types
Heat treatment, describe the structure and properties obtained.
5. Products made of steel 40 are required to be improved. Assign a thermal mode
Processing, describe the nature of the transformations that occur, the structure and properties of steel
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