Garbuzova KR1 Option 27

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Option 27

• Describe the phenomenon of polymorphism in the application to zirconium. Draw the elementary

Crystalline cells, specify their parameters and coordination number.

• What is the essence of the work hardening and how does it have practical use?
• 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 1.1% C. What is the structure of this

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

• What is the difference between the carburizing process in a solid carburizer from the gas

Carburization? How can we fix the coarse-grained structure of overheating of cemented

Products?

• The gears of steel 45 are hardened: the first - from the temperature of 740 ° C, and the second - from 820 ° C.

Using the iron-cementite state diagram, apply the selected heating temperatures and

Explain which of these gears has a higher hardness and better performance

Properties and why.