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Garbuzova КР1 Option 36
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Option 36
1. Draw a phase diagram for the case of the formation of a stable chemical
Connection. Specify the structural components in all areas of this diagram and describe
The structure of typical alloys of various compositions occurring in this system.
2. What is the limit of endurance? How can I increase the endurance limit
Springs? Describe the essence of the proposed method.
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 the phase rule) for an alloy containing 0.1% 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 a curve of a mode of the thermal processing providing hardness obtaining 60 ... 63 HRC.
Indicate how this regime is called, describe the nature of the transformations and what structure
Is obtained in this case.
5. What is the negative effect of cementite mesh on the properties
Tool steel U10 and U12? What heat treatment can destroy it? FROM
Using the iron-cementite state diagram, justify the selected thermal mode
Processing.
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