Materials kontrolnaya2 / variant7 on Garbuzova

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Uploaded: 18.06.2012
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Given exhaustive answers to 5 questions 7 option 2 control work on material for the training manual Garbuzova NE

1. Set the temperature quenching, cooling medium and temperatu¬ru holiday springs from steel 65G, which should have a hardness of 45 ... 50NRC. Describe the microstructure and properties.

2. As a result of thermal and chemical-thermal treatment of gears need to get a solid wear-resistant surface layer in the viscous core. For the manufacture of steel chosen 18HGT. Specify the structure and determine the troupe began as intended. Give and justify the regime of thermal, chemical-thermal treatment, obyas¬niv effect of doping on transformations occurring at all stages of the heat treatment of the steel. Describe svoy¬stva microstructure and surface of the core and the pinion after the heat treatment.

3. In some parts of precision instruments selected alloy Elinvars. Specify the composition and determine which group the alloy as intended. Describe the effect of alloying elements on the main characteristics of the alloy, and the reasons for choosing this alloy.

4. For details of fixtures selected BrOTsS4-4-2,5 bronze. Decipher and describe the composition of the alloy structure. Explain the purpose of alloying elements. The characteristics of the mechanical properties of the alloy.

5. phenol-formaldehyde laminates (polyethylene and vinyl liner). Their properties and application in mechanical engineering.

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