Surface heat treatment of vacuum heat treatment equipment

Surface heat treatment of vacuum heat treatment equipment

 

 

 

Surface heat treatment is a metal surface heat treatment technology that only heats the surface of the workpiece to change the mechanical properties of the surface. In order to only heat the surface layer of the workpiece without allowing too much heat to be transferred into the workpiece, the heat source used must have a high energy density, that is, a larger amount of heat energy is given to the workpiece per unit area, so that the surface or part of the workpiece can be short-term or instantaneous. reach high temperature. The main methods of surface surface heat treatment are flame quenching and induction heating surface heat treatment. Commonly used heat sources are flames such as oxyacetylene or oxypropane, induced current, laser and electron beam.

Vacuum heat treatment equipment Overall surface heat treatment

 

 

 

1. Annealing is to heat the workpiece to an appropriate temperature, select different holding times according to the material and the size of the workpiece, and then slowly cool down, the purpose is to make the internal structure of the metal reach or approach the equilibrium state, and achieve excellent technical performance and application performance, or Make arrangements for further quenching.

 

 

 

2. Normalizing is to heat the workpiece to a suitable temperature and then cool it in the air. The effect of normalizing is similar to that of annealing, but the resulting arrangement is finer. It is often used to improve the cutting performance of materials, and is sometimes used for some less demanding requirements. The parts are heat treated as the end surface.

 

 

 

3. Quenching is to rapidly cool the workpiece in a quenching medium such as water, oil or other inorganic salts, organic aqueous solutions, etc. after heating and heat preservation. After quenching, the steel becomes hard, but also becomes brittle.

 

 

 

4. In order to reduce the brittleness of steel parts, the quenched steel parts are kept at an appropriate temperature higher than room temperature but lower than 650 ℃ for a long time, and then cooled. This technique is called tempering.

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