OPTION 16
1. Select steel for the manufacture of springs. Assign the heat treatment mode, describe the essence of the transformations taking place, the microstructure and properties of the springs after treatment. How can I increase the spring fatigue strength?
2. For the manufacture of machine taps, R10K5F5 steel was selected. Indicate the composition and determine the steel group as intended. Assign the heat treatment mode, give its justification, explaining the effect of alloying on the transformations that occur at all stages of the heat treatment of this steel. Describe the structures and properties of the steel after heat treatment.
3. For the manufacture of parts operating in active corrosive environments, steel 12X17 was selected. Indicate the composition and determine the steel group as intended. Explain the purpose of the alloying elements introduced into this steel. Assign and justify the heat treatment mode and describe the structure and properties of the steel after processing.
4. For the manufacture of some parts of the aircraft selected alloy D16. Indicate the composition of the alloy, describe the method of hardening, explaining the nature of hardening and indicate the characteristics of the mechanical properties of the alloy.
5. Describe heat-resistant and heat-resistant plastics (with heat resistance above 200 0C). Indicate the conditions for their use

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