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Determination of corrosion-assisted stress crack growth rate in 304L stainless steel welds

✍ Scribed by A. Díaz-Sánchez; V. M. Castaño

Publisher
John Wiley and Sons
Year
2007
Tongue
German
Weight
209 KB
Volume
58
Category
Article
ISSN
0947-5117

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✦ Synopsis

The corrosion assisted stress crack growth rate of 304L stainless steel welds, was determined by the rising displacement test method. The experiments were carried out in a Boiling Water Reactor (BWR) environment, using a refreshed autoclave loop system at 288 C and 8 MPa of pressure. Pre-fatigued CT specimens were used and the crack length was monitored by the potential drop technique. After testing, fractographical analysis and measurement of the initial and final crack length were made. The displacement rates of 3.6 and 2.37 lm/h allowed the initiation and propagation of cracks by stress corrosion cracking, and the test results agree with the crack growth rate values determined with another method. The fracture surfaces are evidence of stress corrosion crack propagation with a transgranular appearance in some cases and transgranular with localized areas of intergranular propagation in others.

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