Garbuzova KR1 Option 49

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Option 49
1. What is a dendrite? How and why are dendrites formed during the crystallization of the real
Ingot?
2. Explain why the plastic deformation of lead at room temperature
Are considered hot deformation, and deformation of tungsten even at a temperature of 1000 ° C is
Cold plastic deformation.
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 3.0% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. Carbon steel 45 after hardening and tempering has a hardness of 50 HRC. Using
Diagram of the iron-iron carbide state and taking into account the transformations taking place in the steel at
Leave, specify the tempering and tempering temperatures. Describe the transformations that occur
With the selected heat treatment modes, and the final structure.
5. Draw a state diagram of iron-iron carbide and determine the temperature
Complete and incomplete annealing and normalization for steel 20. Describe these types of thermal
Processing, describe the structure and properties of steel.

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