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Materials Science control 1 option 1 by Garbuzov
Uploaded: 22.07.2019
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1. What is a liquation? Types of segregation, their causes and methods of elimination.
2. Give the definition of impact strength (KCU). Describe the method of measuring this characteristic of the mechanical properties of the metal.
3. Draw a state diagram of iron-iron carbide, indicate structural components in all areas of the diagram, describe the transformations and construct a cooling curve (using the phase rule) for the alloy containing 3.6% C. What is the structure of this alloy for indoor temperature and how such an alloy is called?
4. Draw a diagram of isothermal transformation of austenite for steel U8, put on it the curve of the mode of isothermal processing, providing a hardness of 45 ... 50 HRC. Indicate how this mode is called, describe the essence of the transformations and what structure is obtained in this case.
5. How the structure and properties of steel 40 and U12 change as a result of quenching from a temperature of 750 and 850 ° C. Explain with iron-cementite using the state diagram. Choose the optimal heating mode for the hardening of each steel.
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