Stainless steel is the general name for different steels used primarily for their resistance to corrosion. One of the major advantages of the stainless steels, and the austenitic stainless steels in particular, is their ability to be fabricated by all the standard fabrication techniques. Austenitic stainless steels also have very high ductility and are in fact capable of being very heavily cold formed, despite their high strengths and high work hardening rate. Few other metals are capable of achieving this degree of deformation without splitting.
Outokumpu Stainless has developed stainless steel HyTens 1000, which is a metastable austenitic stainless steel. It is deformation hardened by cold rolling up to an ultimate tensile strength of 1000 MPa. When forming metastable austenitic steel, martensitic transformation occurs. Since martensite is harder than austenite the material is deformation hardened.
The aim in this report is to find a suitable method to measure the strength in a material that has been subjected to deformation hardening. The material used was HyTens 1000. The methods that are used to estimate the strength in a material have been hardness measurement, magnetic induction – eXacto, X-ray diffraction, tensile testing, LDH – Limiting Dome Height, and LDH- and S-beam strain measurement.
Author: Hellqvist, Karin
Source: Lulea University of Technology
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