ステンレスの加工硬化とは？＜sus＞ | オーエスジー

Mechanism of work hardening
For example, a brand new futon is fluffy.
However, if you use it for a long time, the cotton will be compressed and become hard.
Imagine that a similar phenomenon occurs in the structure of metals.

The metallographic structure is also initially arranged with atoms in an orderly manner.
If the alignment is bent or rubbed, it will crumble and become more clogged and condensed.

Once condensed, the order of atoms is not easily restored.
Even if you put the shape back together, it will still be condensed.

In the case of cutting, the phenomenon of friction between the blade and the workpiece material produces this work hardening.
Especially with carbide tools with high cutting speeds, if the conditions are wrong, the surface will harden in a blink of an eye.

If work hardening occurs, it will adversely affect the service life of the tool in the downstream process, such as taps and reamers.

Among stainless steels, SUS304 in particular is prone to work hardening.