Garbuzova KR1 Option 30

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Option 30
1. How does the modification affect the structure and properties of the cast metal? Explain
The cause of the impact.
2. What is the fatigue limit? Describe the methodology for determining this characteristic
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 a phase rule) for an alloy containing 4.6% of C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. After hardening of the carbon steel, a structure was obtained consisting of ferrite and
Martensite. Apply to 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 and describe all the transformations that took place in the steel during heating and cooling. how
Is this kind of tempering called?
5. For which steels is annealing applied to granular perlite? Explain the choice of mode and
The purpose of this kind of treatment.


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