What are the reasons for the cracking of stainless steel material during stretching?

Stainless steel has a low elongation rate, a large elastic modulus E, and a high hardening index.

The tensile cracking of the stainless steel plate sometimes occurs after the tensile deformation, sometimes immediately when the tensile part is withdrawn from the die; sometimes it occurs when the tensile deformation is subjected to impact or vibration; sometimes after the tensile deformation It happens after a period of storage or during use.

Analysis of common problems in stainless steel stretching process:

1. Causes of cracking

Austenitic stainless steel has a high cold work hardening index (stainless steel is 0.34). Austenitic stainless steel is meta-stable and undergoes phase transformation during deformation, which induces martensite phase.

Martensite is relatively brittle, so it is prone to cracking. During plastic deformation, as the amount of deformation increases, the content of induced martensite will also increase with the increase of the amount of deformation, and the greater the residual stress. The relationship between residual stress and martensite content: induced horse The higher the content of the tensite phase, the greater the residual stress caused, and the easier it is to crack during processing.