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Metals 2016, 6(7), 167; doi:10.3390/met6070167

Atmospheric-Induced Stress Corrosion Cracking of Grade 2205 Duplex Stainless Steel—Effects of 475 °C Embrittlement and Process Orientation

1
Materials Performance Centre, School of Materials, The University of Manchester, Sackville Street, Manchester M13 9PL, UK
2
Corrosion and Protection Centre, School of Materials, The University of Manchester, Sackville Street, Manchester M13 9PL, UK
3
Brunei Shell Petroleum Sendirian Berhad, Jalan Utara, Panaga, Seria KB2933, Negara Brunei Darussalam
*
Author to whom correspondence should be addressed.
Academic Editor: Soran Birosca
Received: 30 April 2016 / Revised: 8 July 2016 / Accepted: 12 July 2016 / Published: 19 July 2016
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)

Abstract

The effect of 475 °C embrittlement and microstructure process orientation on atmospheric-induced stress corrosion cracking (AISCC) of grade 2205 duplex stainless steel has been investigated. AISCC tests were carried out under salt-laden, chloride-containing deposits, on U-bend samples manufactured in rolling (RD) and transverse directions (TD). The occurrence of selective corrosion and stress corrosion cracking was observed, with samples in TD displaying higher propensity towards AISCC. Strains and tensile stresses were observed in both ferrite and austenite, with similar magnitudes in TD, whereas, larger strains and stresses in austenite in RD. The occurrence of 475 °C embrittlement was related to microstructural changes in the ferrite. Exposure to 475 °C heat treatment for 5 to 10 h resulted in better AISCC resistance, with spinodal decomposition believed to enhance the corrosion properties of the ferrite. The austenite was more susceptible to ageing treatments up to 50 h, with the ferrite becoming more susceptible with ageing in excess of 50 h. Increased susceptibility of the ferrite may be related to the formation of additional precipitates, such as R-phase. The implications of heat treatment at 475 °C and the effect of process orientation are discussed in light of microstructure development and propensity to AISCC. View Full-Text
Keywords: duplex stainless steel; 475 °C embrittlement; atmospheric-induced stress corrosion cracking; electron backscatter diffraction; X-ray diffraction; residual stress duplex stainless steel; 475 °C embrittlement; atmospheric-induced stress corrosion cracking; electron backscatter diffraction; X-ray diffraction; residual stress
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Örnek, C.; Idris, S.A.; Reccagni, P.; Engelberg, D.L. Atmospheric-Induced Stress Corrosion Cracking of Grade 2205 Duplex Stainless Steel—Effects of 475 °C Embrittlement and Process Orientation. Metals 2016, 6, 167.

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