Garbuzova KR1 Option 07

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Option 7
1. Describe the phenomenon of polymorphism in the application to the gland. What practical significance
it has?
2. How do the properties of the deformed metal change with heating, what processes
Occur at the same time?
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 0.7% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. Draw a diagram of the isothermal transformation of the austenite of steel V8. Apply on
It is a curve of the isothermal processing regime, which provides a hardness of 20 ... 25 HRC. Specify,
How this mode is called and what structure is formed in this case.
5. Die plates made of steel are hardened: the first - from the temperature of 760 ° C, the second - from
Temperature 850 ° C. Using the iron-cementite state diagram, indicate temperatures
Quenching, explain which of these dies is tempered correctly, has higher cutting
Properties and why.

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