Garbuzova NE Solution KR1 Variant 01 Material Science

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The decision of the control work No. 1 on materials science from the methodology of Garbuzova N.E.
Variant 01


1. What is segregation? Types of segregation, the causes of their occurrence and methods of elimination.

2. Give the definition of impact strength (KCV). Describe the methodology for measuring this
characteristics of mechanical 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 3.6% 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 45 ... 50
HRC. Indicate how this regime is called, describe the nature of the transformations and what structure
is obtained in this case.

5. How does the structure and properties of steel 40 and V12 change as a result of quenching from
temperatures of 750 and 850 ° C. Explain with the use of the iron-cementite state diagram.
Choose the optimum heating mode for hardening each steel.


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