Zhengzhou Gou's tells you what surface quenching is and its classification and characteristics

The heat treatment method that changes the surface structure of the part by rapidly heating and cooling the surface of the part, thereby obtaining high hardness, high fatigue strength and high wear resistance on the surface is called surface quenching. Zhengzhou Gou's tells you the classification and characteristics of surface quenching.

(1) Classification of surface quenching

1. According to different heat sources during heating, surface quenching can be divided into two categories: external heating (such as salt bath heating, flame heating) and internal heating (such as induction heating, resistance heating).

2. According to the nature of the heat source, it can be divided into induction heating surface quenching, flame heating surface quenching, flame heating surface quenching, electrical contact heating surface quenching, immersion heating surface quenching, laser and electron beam heating surface quenching, etc. At present, induction heating surface quenching is widely used in industrial production.

(2) Characteristics of surface quenching

1. Energy-saving and clean heat treatment. Its energy consumption has great advantages compared with chemical heat treatment and quenching and tempering treatment. When the difference between the quality of the quenched part of the workpiece and the overall quality is greater, its advantages become more significant and it often has high added value; its quenching medium is generally Water or aqueous solution with additives has almost no fumes, so the working environment is good.

2. The production efficiency is high and there are few quenching defects. Using rapid surface heating and cooling methods, the production cycle is short, productivity is high, and time and effort are saved. Because the heat time is short, oxidative decarburization is slight. And because only the surface layer is heated and the center is still cold, the quenching deformation is also small.

3. The equipment is compact and has a good working environment. More in line with environmental requirements.

4. It is easy to realize mechanization and automation, and is suitable for mass production of various surface quenching devices. They can be made into automatic machines to realize modern mechanical operations and reduce human labor, or they can be placed on automatic production lines and assembly lines to implement precise process control or Program control has obvious advantages over mass production methods, and has great advantages in improving efficiency and saving energy.

5. Use high power density and fast heating speed. The key to rapid heating is that the heat source supplies heat to the workpiece with a very high power density (energy W/cm2 or kW/cmz provided to the unit surface area of the workpiece per unit time), so that the surface of the workpiece receives a very high power density in a short period of time. heat. When this heat is not transferred into the interior of the workpiece to a large extent, the temperature of the heated surface layer quickly rises to above the transformation point and austenitizes. Surface quenching can be achieved by rapidly cooling the austenitized surface layer, transforming the surface structure into martensite while the core structure remains unchanged.

6. Limitations of surface quenching. It is not suitable for workpieces with complex shapes and generally requires special tooling such as sensors. For example, induction heating surface quenching, laser and electron beam heating surface quenching, etc. still require special complete sets of equipment, and their investment costs High, thus also limiting its wider application.

If you have any questions about surface hardening, you can contact us. Zhengzhou Gou's is a manufacturer specializing in the production of high-frequency quenching equipment, medium frequency melting furnaces, ultrasonic induction heating devices and other heating equipment. The company not only has professional equipment, but also has a professional technical team to continuously update technology.