3 Effects of Heat Treatment: Do You Really Know?


The effect of heat treatment is different due to the different materials and treatment methods of the parts to be treated.

That is, the same material adopts the same heat treatment method, and also has different effects due to the different sizes and shapes of the parts to be treated.

These influencing factors are collectively called effects, and there are three kinds of effects.

Effects of Heat Treatment

1. Quality effect

Due to the different size and quality of the processed parts, the heat treatment results, especially the quenching results, are different, which is called quality effect.

Generally, the larger the diameter of the steel, the harder it is to harden;

The finer the diameter, the easier to harden.

The difference lies in the quality effect.

The so-called large quality effect refers to the large difference in heat treatment results caused by different quality, which means that the larger the part, the harder the quenching is.

It goes without saying that small parts with small mass effect can be quenched even large parts.

Carbon casting is an example of steel with large quality effect.

Chromium molybdenum steel and nickel chromium molybdenum steel are examples of steel with small quality effect.

Due to different parts sizes, the quenching effect is different;

However, due to different steel types, the quenching effect is different from the hardenability, which is analyzed from different angles, and the hardenability is analyzed from the perspective of steel material.

2. Shape effect

The quenching effect is affected by the shape of the parts.

Different shapes such as bars, plates and balls have different quenching effects.

In addition, even the same processed parts have different quenching positions and different cooling methods, and the quenching effects are also different.

The influence caused by the shape of the parts is the so-called shape effect.

The ratio of cooling effect is: Ball: round rod: plate = 4:3:2.

Due to different parts, the difference in cooling effect is that if the flat plate is 1, the 2-face angle is 3, the 3-FACE angle is 7, and the concave face angle is 1 / 3.

3. Size effect

The mechanical properties of steel are not determined by material, but change with the change of shape and size.

Generally, the mechanical strength is low when the steel size is large.

This change in mechanical properties with changes in shape and size is called size effect.

The most prominent mechanical properties showing size effect are fatigue strength, tensile strength and wear resistance, which also have size effect, so attention should be paid.


Through the introduction of this article, I believe you have a better understanding of the three effects of heat treatment.

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