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Relationship and difference between high frequency quenching and quenching and tempering process

Today, I will introduce you to the relevant knowledge about the high-frequency quenching and quenching and tempering process in the steel processing process. What is the meaning of quenching and tempering, and what is the connection and difference between quenching and tempering? Let's unravel and confuse, let's take a look!
What is the meaning of tempering?

Quenching and tempering is a comprehensive heat treatment process of quenching and high temperature tempering.

Most of the tempering parts work under relatively large dynamic loads. They are subjected to stretching, compression, bending, torsion or shearing. Some surfaces also have friction, which requires a certain degree of wear resistance. In short, the parts work under a variety of composite stresses. These parts are mainly structural parts of various machines and mechanisms, such as shafts, connecting rods, studs, gears, etc., which are commonly used in the manufacturing industries such as machine tools, automobiles and tractors. Especially for large parts in heavy machine construction, quenching and tempering treatment is used more. Therefore, quenching and tempering treatment occupies a very important position in heat treatment.

Whether quenching and tempering and high frequency quenching conflict

No conflict, quenching and tempering treatment is semi-processed, high-frequency quenching can be used as a post-treatment process, and after the general high-frequency quenching process is completed, coupled with a low-temperature tempering process, the stress of the workpiece can be removed accordingly.
The relationship between quenching and quenching:

The quenching process has a short heating time, the workpiece is rapidly heated to the quenching temperature, and then rapidly cooled, and the workpiece begins to cool before the uniform austenite structure is obtained, at which time the quenching is nearly incomplete quenching.

Quenching and tempering usually refers to quenching + high temperature tempering, which is a heat treatment process for obtaining tempered sorbite, and the purpose is to obtain comprehensive mechanical properties with good strength and plasticity.

In order to obtain a uniform quenched structure, it is necessary to use a quenching and tempering treatment as a pretreatment for induction hardening in order to obtain a well-smoothed sorbite structure.

Quenching and tempering heat treatment method

Quenching and tempering is often used for 45# or 40Cr. These two materials are also called quenched and tempered steel, so the landlord said it should be determined as these two materials.

The approximate time for heating and holding should be determined according to the size of the part. It is not well determined here. However, the use of intermediate frequency heating should not be suitable because the speed of induction heating is fast, it cannot fully austenize the structure and cause coarse grains. It is very unfavorable for the quenching and tempering process. After quenching and tempering, the microstructure should be uniform tempered sorbite structure of grade 4 or above.

Surface quenching should use high frequency heating so that it does not affect the Soxite structure of the heart.

Ordinary mass production can only be repeated periodically to repeat the above process, and this is the most extensive processing method. If conditions and mass production, and require production efficiency and smoothness of part quality, then you can use Pipeline production. Our original unit has a production line for producing self-powered screws. It is transported by steel soft net, using electric heating, and can be added with acetone to prevent decarburization.

Quenching and tempering is used for the overall final heat treatment of important parts subjected to load. Therefore, the overall performance and grain size of the structure are important. The speed of induction heating is very fast, when the carbon is not completely dissolved in the austenite. The critical temperature has already been reached. If the heating is continued, it will cause excessive burning or melting. The internal structural stress of the material is not completely eliminated, causing hidden dangers. Therefore, it is not suitable.

Induction heating is only used for surface heat treatment, so that the surface quickly reaches the critical point without affecting the overall microstructure.

In summary, Haituo Electromechanical Co., Ltd. shares knowledge about high-frequency quenching and quenching and quenching, as well as heat treatment between general quenching. If you want to learn the heat treatment process of steel, you must be familiar with the above theoretical knowledge.
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