Dongchi casting to explain the common problem analysis in the process of stainless steel stretching:
1. Reasons of tensile cracking of stainless steel:
Austenitic stainless steel has a high hardening index (stainless steel 0.34). The austenitic stainless steel is a substable type, which can change during deformation and induce martensitic phase. The martensite is brittle and therefore prone to cracking. During plastic deformation,, with the increase of the deformation induced martensite content will also be increased with the increase of the deformation and residual stress. : the relationship between residual stress and the martensite content induced martensite phase content is higher, the cause of residual stress is, the greater the during processing are also more prone to cracking.
2. Reasons for the formation of stainless steel tensile surface:
A scratch on the surface of the deep drawing of stainless steel is mainly due to the relative movement artifacts and mould surface, under the action of certain pressure, the local surface of billet and the mold friction directly, combined with the deformation of the billet hot billet and scrap metal deposition in the mold on the surface, the surface scratch scratch.