Option 20
1. Describe the conditions for obtaining a fine-grained structure of the metal when spontaneously
Developing crystallization (using Tammann curves).
2. What is cold plastic deformation? How does the structure and
Properties of metal?
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 1.6% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. Using the state diagram, iron-iron carbide and the hardness change curve in
Depending on the tempering temperature, assign a heat treatment mode for the carbonaceous
Steel 45, required to provide a hardness of 550 HB. Describe the transformations taking place
At all stages of heat treatment, and the structure obtained after processing.
5. What are the causes of internal stresses during hardening? How
Can protect the product from the formation of hardening cracks?