Help solve this material question, and help me solve this question in detail

1. Preparation of materials (generally the first state of the material, mostly normal, metallographic is pearlite).

2. Forging (when the temperature is above 800°, the metallographic is austenite) Austenite is a metallographic suitable for forging.

3. Normalizing (after the forging is completed, let it be naturally cooled to room temperature in the air, and the metallographic at this time is pearlite).

4. The purpose of forging is to improve the metal streamline texture, which will improve the mechanical strength in a specific direction, such as: crankshafts with poor working conditions, the best pre-processing is to use forging, not casting.

5. Quenching and tempering treatment after rough machining (mainly to improve the comprehensive properties of the material, quenching and tempering not only improves the stiffness of the material, but also retains the toughness of the material), so that the components can be stable and reliable after subsequent finishing machining, and also maintain a certain comprehensive strength and toughness.

6. High-frequency induction quenching (generally after quenching and tempering components need to be quenched, they can only be quenched with high-frequency quenching, high-frequency quenching is surface quenching, if quenching with a furnace kiln will destroy the previous quenching and tempering, quenching and tempering is meaningless) high-frequency induction quenching is to improve the hardness of the surface, and the metallographic at this time is martensitic.

7. Tempering after high-frequency quenching (eliminate the stress after quenching, homogenize the coarse martensite crystals, so that the tempering layer has considerable toughness and will not crack in use).

First of all, start with normalizing: after the material is forged, it is afraid that its hardness will affect the processing performance is poor. A process used to facilitate machining.

The biggest purpose of this process is to eliminate internal stress and prevent deformation and cracking. Personally, I think it can be canceled. No factory wants to do that.

Generally, it is processed directly.

Quenching and tempering is a process that takes into account the internal hardness of the material. The aim is to improve the internal hardness of the material.

After finishing. High-frequency induction and heating quenching is a process designed to reach a certain hardness value on the surface of the material. This is a process that is added due to the specificity of the material.

The subsequent low-temperature tempering is an adjustment to the previous heat treatment process. I raise the hardness of the overall material. and the elimination of internal stress. Improves material strength.

It is greater than both sides and smaller than the middle.

This parameter generally does not need to be configured, and the default parameter is used.

It is mainly used to pass through packets when there is too much data and may cause congestion: fair-queue is generally used for low speed, and specific data priority is set; The high-speed is FIFO, first-in, first-out;

If you use the network for low speed, but the fair-queue (no fair-queue) is canceled, that is, the configurator thinks that although the network is low-speed, all services have the same priority.

1) Hokkaido; Honshu; Swim in the Sea of Japan; Pacific Ocean; South Korea 2) four disturbances; Zhongshen rolling; Tokyo.

3) feedstocks and fuels; International.

4) Pacific Ocean; The port conditions are excellent, which is convenient for the import of raw materials, fuels and the export of industrial products.

1) Iceland; Onishi.

2) the European Union (Slow Bridge EU); Blind before development.

3) CB 4) The mountains are mostly east-west, and the plains are vast and connected, which is conducive to the long-term flow of warm and moist air over the Atlantic Ocean.

1. All: 1. Hydrostatic speed = (16+24) 2 = 20 Current speed = 4: Speedboat downwater time = 60 (4+16) = 3 (hours), Speedboat backwater time = 60 (16-4) = 5 (hours), Total time = 3+5 = 8 (hours).

2. Set X hours after A catches up with B.

26+6）*x = （26+6）*（2+x）x = 14

Can I use x,y? If I can, I'll do it.

x1 is equal to 11 and x2 is equal to nine-quarters.

It's not going to be what you learned in math.