The Fatigue Properties of Duplex Stainless Steels: Role of Microstructure |
| Journal |
Key Engineering Materials (Volumes 378 - 379) |
| Volume |
Advances in Understanding the Fatigue Behavior of Materials |
| Edited by |
Dr. T. S. Srivatsan, FASM, FASME |
| Pages |
101-114 |
| DOI |
10.4028/www.scientific.net/KEM.378-379.101 |
| Online since |
March, 2008 |
| Authors |
Jean Bernard Vogt
|
| Keywords |
Dislocation Structure, Nitrogen Content, Phase Proportion, Short Crack |
| Abstract |
The paper analyzes the role of microstructure on the low cycle fatigue behaviour of
duplex stainless steels. The alloys are investigated in their as received condition and after
ageing at 475°C. The fatigue resistance and the cyclic accommodation of these DSS are
strongly controlled by the volume fraction of α and γ "phases which is related to the chemical
composition in particular nitrogen. It is shown that DSS with a high fraction of austenite
present a good combination of fatigue resistance and cyclic softening especially in the aged
condition. The mutual interaction between ferrite and austenite referred to load transfer is
beneficial for increasing the fatigue resistance. Alloying with nitrogen appears to be a promising
way to master an optimised microstructure leading to high mechanical resistant DSS. |
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