Garbuzova KR1 Option 23

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Option 23
1. Describe the phenomenon of polymorphism in the annex to tin.
2. Which temperature separates the areas of cold and hot plastic deformation and
why? Consider the example of iron.
3. Draw a state diagram of iron-iron carbide, 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 3.8% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. It is required to produce surface hardening of products made of steel 15. Assign a kind
Processing, describe the technology occurring in steel conversions, the structure and properties
Surface and core of the product.
5. Using the iron-cementite state diagram, determine the temperature of the total and
Incomplete annealing and normalization for steel 40. Describe these thermal regimes
And describe the change in the structure and properties of the steel in the process of each treatment

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