Solution KR2 from the methodology Garbuzova Variant 44

Product description

Decision control work number 2 on materials science from the methodology Garbuzova N.E.

Variant 44

Tasks:

• Select steel for making springs. Assign a heat treatment mode,

Describe the nature of the transformations that occur, the microstructure and the main properties of the springs after

processing. How can fatigue strength of springs be increased?

• As a result of thermal and chemical-thermal treatment, the transmission shafts

car should receive a hard abrasion-resistant surface layer when viscous

the medium. For their manufacture, steel 15ХГН2ТА is chosen. Decipher the composition of steel and

determine the steel group for the purpose. Assign a heat treatment mode, bring it

justification, explaining the effect of doping on the transformations occurring during thermal

processing. Describe the microstructure and properties of the steel after heat treatment.

• For the manufacture of vacuum equipment and the achievement of tight contacts between

metal and glass is used alloy platinum H48. Decode the composition and define the group

alloy to the destination. Describe the effect of alloying elements on the main characteristic

alloy and the reasons for choosing this alloy composition (in connection with the anomaly of the change in the thermal

coefficient of expansion).

• The alloy AL1 is chosen for the pistons of the internal combustion engine. Decode the composition

alloy, specify the method of manufacturing parts, the heat treatment and nature

hardening. Describe the characteristics of the mechanical properties of the alloy.

• Advantages and disadvantages of plastics. The use of plastics for die tools.