Effect of 475 °C embrittlement on the mechanical properties of duplex stainless steel

Sahu, J K and Krupp, U and Ghosh, R N and Christ, H J (2009) Effect of 475 °C embrittlement on the mechanical properties of duplex stainless steel. Materials Science and Engineering: A, 508 (1-2). pp. 1-14.



The binary iron–chromium alloy embrittles in the temperature range of 280–500 °C limiting its applications to temperatures below 280 °C. The embrittlement is caused by the decomposition of the alloy to chromium-rich phase, α′ and iron-rich phase, α. This phenomenon is termed 475 °C embrittlement as the rate of embrittlement is highest at 475 °C. Primarily the investigations on 475 °C embrittlement were confined to binary iron–chromium alloys and ferritic stainless steels. Duplex stainless steel grades contain varying proportions of ferrite and austenite in the microstructure and the ferritic phase is highly alloyed. Moreover, this grade of steel has several variants depending on the alloy composition and processing route. This modifies the precipitation behaviour and the resulting change in mechanical properties in duplex stainless steels when embrittled at 475 °C as compared to binary iron chromium systems. The precipitation behaviour of duplex stainless steel at 475 °C and the effect on tensile, fracture and fatigue behaviour are reviewed in this article.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/j.msea.2009.01.039
Uncontrolled Keywords:Duplex stainless steel; Ferritic phase; 475 °C embrittlement; Tensile behaviour; Impact energy; Fracture toughness; Fatigue behaviour
Divisions:Material Science and Technology
ID Code:24
Deposited By:Dr. A K Sahu
Deposited On:22 Sep 2009 15:30
Last Modified:08 Feb 2012 17:12
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