Option 19
1. What are the properties of metals and what are the characteristics of the type of bonding these properties
Are conditioned?
2. Which temperature separates the areas of cold and hot plastic deformation and
why? Consider the example of copper.
3. Draw a state diagram of iron-iron carbide, 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 4.3% C. What is the structure of this
Alloy at room temperature and how such an alloy is called?
4. Using the iron-cementite state diagram, determine the temperature
Normalization, annealing and hardening for steel U10. Describe these types of heat treatment
And describe the structure and properties of steel after each treatment mode.
5. Carbon steel 45 and U8, after quenching and tempering, have a martensite structure
Release and hardness: the first - 50 HRC, the second - 60 HRC. Using the iron-
Carbide iron and taking into account the transformations occurring in these steels during tempering, specify the tempe
The hardening temperature and tempering temperature for each steel. Describe the transformations taking place in
These steels in the quenching and tempering process, and explain why steel U8 has a greater hardness,
Than steel 45.