Garbuzova KR1 Option 17

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Option 17
1. Explain the mechanism of the influence of various types of modifiers on the structure of the cast
Metal.
2. For what practical purposes is cold hardening applied? Explain the essence of this phenomenon.
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 3.1% 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 austenite for steel V8. Apply
On it is a curve of the isothermal treatment regime, which provides a hardness of 25 HRC.
Specify how this mode is called and what structure is obtained in this case.
5. After hardening of the carbon steel, a structure was obtained consisting of ferrite and
Martensite. Draw on the state diagram the iron-cementite ordinate corresponding to
To the composition of the given steel (approximately), indicate the temperature adopted in this case for heating
Hardening. What is the name of this treatment? What transformations occurred during heating and
Cooling steel?

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