Garbuzova KR2 Option 13

1. It is necessary to assign the quenching temperature, cooling medium and tempering temperature for thread gauges made of U10A steel. After heat treatment, transformations occur that affect the microstructure and hardness of the tool. Describe the essence of these transformations and the properties of the tool after heat treatment.

2. For the manufacture of traction parts, which must have increased strength over the entire cross-section (hardness 250...280 HB), 30ХМ steel was chosen. It is necessary to indicate the composition and determine the steel group by purpose. It is also necessary to assign and justify the heat treatment regime, explaining the effect of alloying on the transformations that occur during heat treatment of a given steel. Finally, describe the structure and properties of steel after heat treatment.

3. For parts that will be used in contact with strong acids, 12X17 steel was selected. It is necessary to indicate the composition and determine the class of steel. It is also necessary to explain the reason for the introduction of chromium into this steel and justify the choice of this steel for the specified operating conditions.

4. In the aircraft industry, the MLZ alloy is used for the manufacture of some parts. It is necessary to decipher the composition of the alloy, indicate the method of manufacturing parts from this alloy and describe the characteristics of the mechanical properties.

5. Foams are materials that have many varieties and properties. It is necessary to describe these varieties and properties. You should also indicate the areas of application of foam plastics in mechanical engineering.

Garbuzova KR2 Option 13

Garbuzova KR2 Option 13 is a digital product intended for students and teachers who are preparing for the Test in the discipline "Mathematical Methods in Economics".

Garbuzov KR2 Option 13 includes:

• Theoretical materials on the main topics of the discipline;
• Practical tasks with detailed step-by-step solutions;
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• Recommendations for preparing for the test.

Garbuzova KR2 Option 13 is an excellent choice for those who want to prepare for the Test in the discipline "Mathematical Methods in Economics" and get a high grade.

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Garbuzova KR2 Option 13 is most likely the name of an examination task or test in metal technology and materials science. Descriptions of the tasks are below.

1. For heat treatment of thread gauges made of U10A steel, it is necessary to assign a quenching temperature, a cooling medium and a tempering temperature. U10A steel belongs to carbon steels and undergoes two transformations: the first is the redistribution of carbon in austenite when heated to the Ac3 temperature, the second is the transformation of austenite into martensite when cooled from the Ac1 temperature. The recommended hardening temperature for U10A steel is 800-850°C, the cooling medium is water or oil, and the tempering temperature is 150-200°C. After heat treatment, calibers made from U10A steel have a martensitic microstructure and high hardness, ensuring their durability and wear resistance during operation.

2. To manufacture rods from 30ХМ steel, it is necessary to select a certain heat treatment mode, taking into account the composition and group of steel. Steel 30ХМ is an alloy steel and contains chromium, molybdenum and nickel. It belongs to the group of steels intended for the manufacture of parts operating under high loads and temperatures. Recommended heat treatment regime for rods made of 30ХМ steel: heating to 950-1000°C, holding for 1 hour, cooling in air or on the surface of a liquid, tempering at a temperature of 600-650°C. Alloying with chromium and molybdenum improves the strength properties of steel and increases its resistance to corrosion and high temperatures.

3. 12X17 steel contains 12% chromium and 0.17% carbon. It belongs to the class of martensitic stainless steels and is characterized by high corrosion resistance when working in acidic environments. Chromium provides corrosion protection by forming a passive oxide film on the surface of the steel, which prevents further degradation of the material. The choice of 12X17 steel for parts working in contact with strong acids is due to its high corrosion resistance and sufficient strength properties.

4. MLZ alloy is a magnesium-lithium alloy containing 9% lithium and 1% magnesium. It belongs to light structural alloys with high strength and rigidity with low weight. The production of parts from this alloy is done by injection molding, which makes it possible to obtain complex shapes and precise dimensions. The mechanical properties of MLZ alloy include high tensile strength, fatigue strength and resistance to high temperatures. This alloy is widely used in the aviation and space industries to make lightweight and durable structures.

5. Foams are materials obtained by forming foam structures from polymer materials using thermal or chemical action. There are several types of foam plastics: polystyrene, polyurethane, polyethylene, polypropylene and others. They have light weight, low thermal conductivity, sound insulation properties and high impact strength. In mechanical engineering, foam plastics are widely used for the manufacture of sealing and elastic elements, sound insulation materials, packaging materials and other products that require a lightweight and durable material with good technical properties.

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