Materials kontrolnaya2 / variant17 on Garbuzova

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Uploaded: 15.09.2012
Content: 20915211739737.rar (42,58 kB)

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Given exhaustive answers to questions 17 5 Option 2 control work on material for the training manual Garbuzova NE
1. Set the mode of thermal and chemical-thermal treatment of gears made of steel with a hardness of tooth 20X 58 ... 62 HRC. Describe mikro¬strukturu and the surface of the tooth and core after heat treatment.
2. As a result of the heat treatment should have high spring elasticity. For the manufacture of selected steel 70S3A. Specify the composition of the group and determine the steel for its intended purpose. Give and justify the regime of heat treatment, explaining the effect of doping on the transformations occurring during heat treatment of the steel. Describe the structure and properties of the springs after heat treatment.
3. For the manufacture of permanent magnets section 50x50 mm alloy selected EX. Specify the composition of the alloy and a group of appointments. Assign the mode of heat treatment, provide justification and describe the structure of the alloy after treatment. Explain why in this case can not be applied steel U12.
4. For the manufacture of some parts of the aircraft selected alloy AMg. Decipher composition, describe a method of hardening of the alloy, to explain the nature of hardening. The characteristics of the mechanical properties of the alloy.
5. Specify the composition and properties of ceramics used in the electrical instrument.

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