When it comes to heat treatment, it has to be mentioned that industrial four fires are annealed, normalized, quenched, tempered
Today we will talk about their differences.
Annealing is to slowly heat the metal to a certain temperature for a period of time and then slowly cool to room temperature.
Think about how you cooked the bowl but it’s too hot.
So you have to put it aside and let it cold and then eat it. This is the truth.
Normalizing is to heat the metal to a critical temperature above 30-50 ° C
The heat treatment process of cooling in air after a suitable period of time sounds sounds
It’s just that the normalizing cooling rate is slightly faster and the production cycle is shorter because the normalizing heat is cooled like this.
It is often faster to eat the surface, that is, to get the product faster, so the annealing and normalizing can also achieve the performance requirements of the part.
If annealing and normalizing are brothers, then quenching and tempering are good partners who never give up.
Quenching is to heat the metal above the critical point. At this time, the structure and state of the metal will change. Austenitization requires a certain period of time for the metal to make this change and then cool it to a greater extent than the critical cooling rate. The method of rapid cooling of the martensite structure or the lower bainite structure is usually such
Martensite structure is obtained after quenching, but the internal structure of this organization state is extremely unbalanced.
Although the hardness is high, the plasticity and toughness are not brittle. Therefore, the metal after quenching will not be shipped as a finished product. After all, the manufacturer is not stupid. This metal that cannot be reprocessed is harder than the Iphone 6s screen.
So the role of tempering is reflected!
After the metal is hardened, it is heated to a temperature below the critical temperature for a period of time to allow the metal structure to be evenly distributed and then cooled to room temperature to obtain a certain degree of strength, hardness and certain plasticity and toughness. Finished product
This is
The perfect example of 1+1>2!
Said that the difference between annealing, normalizing, quenching and tempering is almost the same.
In fact, "quenching" and "tempering" can make the face crisp.
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