SYMPOSIA PAPER Published: 01 January 2005

Influence of Temperature and Microstructure on the Fatigue Behaviour in the Threshold Regime for a Super Duplex Stainless Steel


The fatigue crack propagation behaviour of a super duplex stainless steel in the near threshold regime at -50°C, 20°C (RT) and 150°C has been studied. The fatigue threshold values of the stress intensity factor range and the effective threshold value of this material are higher at -50°C and 150°C than at RT. The closure threshold value is also smaller at RT than at -50°C, but comparable with that at 150°C. The material aged at 475°C for 3 hours shows similar effective threshold value, but a smaller closure threshold value. Crack propagation mismatch at the interface of the two phases and brittle to ductile fracture transition in the material at -50°C or in the aged material at RT were observed, and possible mechanisms were discussed.

Author Information

Chai, G
R&D, Sandvik Materials Technology, Sandviken, Sweden
Hansson, S
Dalarna University, Borlänge, Sweden
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Developed by Committee: E08
Pages: 73–83
DOI: 10.1520/STP11487S
ISBN-EB: 978-0-8031-5505-3
ISBN-13: 978-0-8031-2410-3