Micro heterogeous fatigue behaviour of duplex stainless steel during cyclic loading
Paper i proceeding, 2010

Two phase metals can suffer from non-uniform load sharing between the phases or stress heterogeneity on the micro-scale, elastic/plastic anisotropy and other mechanical interactions on the scale of grain size during cyclic loading. These effects strongly influence the fatigue damage and crack initiation behaviour of the two phase metals. In this paper, the fatigue damage and crack initiation behaviours of two austenitic-ferritic duplex stainless steels, UNS S32750 and UNS S32906, have been studied by both experimental investigations such as low cycle fatigue tests, SEM and TEM study, and X-ray and neutron diffraction and simulation using multi-scale material modelling. It has been found that the material damage and crack initiation in these two duplex stainless steels during cyclic loading occur mainly in the ferritic phase that is the weakest phase if the deformation hardening is considered.

Multi-scale material modeling

Low cycle fatigue

Fatigue crack initiation

Fatigue damage

Duplex stainless steels


G. Chai

Sandvik Materials Technology

Robert Lillbacka

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

R. Lin Peng

Linköpings universitet

18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale, ECF 2010; Dresden; Germany; 30 August 2010 through 3 September 2010