Garbuzova KR2 Option 35

Garbuzova KR2 Option 35

1. It is required to produce a surface hardening of products made of 15X steel. Assign a view
processing, describe its technology, the transformations occurring in steel, the structure and properties
surface and core.
2. As a result of heat treatment, the mandrels should have increased strength
over the whole section (hardness 250 ... 280 НВ). For the manufacture of their chosen steel 40HN. Please specify
composition and determine the steel group by. purpose. Assign and justify the thermal
treatment, explaining the effect of doping on the transformations occurring during thermal
processing of this steel. Describe the structure and properties of mandrels after heat treatment.
3. For the heating elements of resistance, the chromal alloy OX23Si5 is chosen.
Decipher the composition, specify the requirements for alloys of this type, and temperature
boundaries of application of this alloy.
4. Describe the metal-ceramic hard alloys of the TTK group. Specify their composition,
properties and field of application in mechanical engineering.
5. Describe the antifriction polymer coatings, their properties, application method and
conditions of use.