Solution to Test #2 in Materials Science from N.E. Garbuzova´s Manual
Option 42
Tasks:
1. Specify the quenching temperature, cooling medium, and tempering temperature for countersinks
made of U12A steel. Describe the nature of the transformations occurring, the microstructure, and the hardness
of the tool after heat treatment.
2. As a result of heat treatment, machine parts should achieve increased
strength across the entire cross-section (hardness 250...280 HB). ZOKhGS steel was selected for their manufacture.
Indicate the composition and determine the steel group for the intended purpose. Specify the heat treatment regimen, provide its rationale, and explain the effect of alloying on the transformations occurring
during heat treatment. Describe the structure and properties of the steel after heat treatment.
3. Specify a stainless steel for the manufacture of parts operating in an acetic acid environment at temperatures not exceeding 40°C. Provide the chemical composition of the steel, the required heat treatment, and the resulting structure. Explain the physical nature of steel´s corrosion resistance and the role of each alloying element.
4. Kovar 29NK alloy is used for sealed conductors in glass vacuum devices.
Indicate the alloy´s composition, properties, and the reasons for its use in this area of technology.
5. Describe thermosetting and thermosetting plastics. How do they differ in structure and properties?
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