QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 2434-8252
Print ISSN : 0288-4771
Stress Corrosion Cracking of Duplex Stainless Steel in High Temperature Water
Toshio KurodaFukuhisa MatsudaKazusige Bunno
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1995 Volume 13 Issue 1 Pages 116-123

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Abstract

Relation between microstructure and stress corrosion cracking in high temperature water for duplex stainless steel was investigated using transmission electron microscopy and fractography.
The samples were solution-treated at various temperatures and then sensitized at 923 K for 72 ks. The slow strain rate testing (SSRT) was carried out at 562 K in water with 8 ppm dissolved oxygen under 8 MPa pressure at a strain rate of 4.17×10-6 s-1.
The volume fraction of α phase and Cr2N in the α phase increasedd with increasing the solution treatment temperature.
For the sensitized sample, M23C6 precipitated at α/γ interface, the bowing area of secondary austenite, namely γ* phase occurred, and σ phase precipitated at the γ*/α interface. They increased with decreasing solution treatment temperature and with decreasing the volume fraction of α phase.
The stress corrosion cracking in high temperature water hardly occurred for the solution-treated samples. The reduction of area of the sensitized sample was much lower than that of the solutiontreated samples and decreased with decreasing solution treatment temperature, because the γ* phases near the M23C6 and the σ phase were predominantly corroded and resolved during the test.

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