Option 34
1. Draw a state diagram for the case of the formation of a continuous series of solid
Solutions. What is a solid solution?
2. What processes occur during hot plastic deformation?
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 2.4% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. The pre-eutectoid carbon steel has a coarse-grained superheat structure. Which
Type of heat treatment should be applied to eliminate the state of overheating? Apply on
A diagram of the iron-cementite state of the ordinate of any pre-eutectoid steel and explain which
Changes occur in the structure of steel under this heat treatment.
5. Assign a gear processing mode of steel 20, which ensures the hardness of the tooth
58 ... 62 HRC. Describe the transformations occurring in steel, the structure and properties of the tooth surface
And the gear core after heat treatment.