90 611 Material version 29

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Uploaded: 30.07.2013
Content: 30730102117630.rar (123 kB)
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Description

Task 1
Assign the temperature quenching, cooling medium and the temperature of the holiday smooth and thread gauges of steel U12A. Describe the essence of the transformation, the microstructure and hardness after heat treatment of the tool.
Task 2
As a result of the heat treatment should have high spring elasticity. For the manufacture of steel chosen 63S2A. Specify the structure, assign and justify the regime of thermal treatment. Describe the microstructure and properties of the steel after heat treatment.
Activity 3
Explain the nature of the heat resistance of nickel-based alloys due to their composition and thermal treatment of the structure obtained. Give examples of these alloys and specify the area of \u200b\u200bapplication.
Task 4
As a material for sliding bearings responsible BrS30 selected alloy. Specify the composition of the group and determine the alloy as intended. Describe the basic features and requirements of this group of alloys.
Task 5
What are the advantages and disadvantages of surface hardening of steel products during heating by high frequency as compared with the method of carburizing hardening? Name steels used for these kinds of treatments.

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