Garbuzova KR1 Option 18

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Uploaded: 19.05.2016
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Option 18
1. What are solid substitution and introduction solutions? Give examples.
2. How and why do metal properties change during 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 0.8% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. Using a state diagram, iron-iron carbide and a graph of the dependence
Hardness from the tempering temperature, set the heat treatment mode (quenching temperature,
Cooling medium and tempering temperature) of articles of steel 50 that must have
Hardness 230 ... 250 HB. Describe the microstructure and properties of steel 50 after thermal
Processing.
5. Steel 40 was quenched from temperatures of 760 and 840 ° C. Using the diagram
State of iron-cementite, indicate the chosen heating temperatures and describe the transformations,
Which occurred in two modes of hardening. Which regime should be preferred and
why?

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