475oC Embrittlement and Room Temperature Fatigue of Duplex Stainless Steel

Wackermann, Ken and Kumar Sahu, Jitendra and Christ, H J (2010) 475oC Embrittlement and Room Temperature Fatigue of Duplex Stainless Steel. In: Proceedings of 18th European Conference on Fracture of Materials and Structures"Fracture of Mateials and Structures from Micro to Macro Scale, 2010, DVM, Berlin.



Duplex stainless steels (DSSs) are two-phase materials consisting of both the ferritic and the austenitic phase. The alloys are prone to embrittlement particularly in the temperature range between 280°C and 512°C. This so-called 475°C embrittlement is caused by a decomposition of the ferritic phase into a chromium-rich α' and an iron-rich α phase. The objective of this study is to develop a better understanding of the embrittling process of DSS of type SAF 2205. Embrittled and non-embrittled DSS was fatigue tested in stress-controlled tests at 475°C and in strain-controlled tests at room temperature. The high temperature fatigue tests were stopped at different cycle numbers in order to characterize the changing material conditions by means of room-temperature tensile tests and scanning electron microscopy pictures of the fracture surfaces.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:http://eprints.nmlindia.org/6038
Uncontrolled Keywords:Embrittlement; room temperature; duplex stainless steel; fracture surfaces
Divisions:Material Science and Technology
ID Code:6038
Deposited By:Sahu A K
Deposited On:12 Sep 2012 15:17
Last Modified:12 Sep 2012 15:17
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