Garbuzova KR1 Option 46

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Option 46

• What explains the high electrical and thermal conductivity of metals?
• How does the structure and properties of the metal change under cold plastic deformation?
• 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 1.2% C. What is the structure of this

Alloy at room temperature and how such an alloy is called?

• 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 55 HRC.

Indicate how this regime is called, describe the nature of the transformations and what structure

Is obtained in this case.

• Forgings of steel 40 have a coarse-grained structure. Using the status diagram

Iron-cementite designate a heat treatment mode for obtaining fine grains and

Explain why the selected mode provides fine-grained steel structure.