The Effect Of Alternate Immersion On Stress Corrosion Cracking Behavior Of Steel And Nickel Alloys In Natural Seawater

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Product Number: 51321-16857-SG

Author: Attilio Arcari; James P. Moran; Derek J. Horton;Edward J. Lemieux; Ryan McCoy; Theresa M. Newbauer

Publication Date: 2021

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Stress corrosion cracking susceptibility of selected high strength alloys was evaluated during exposure
in alternate immersion conditions using bolt loaded compact test geometries with a strain gauge
positioned at the back-face to allow a large sample throughput while including sensitive monitoring of
crack progression during exposure. This approach combines advantages of a traditional KISCC exposure
testing and laboratory-based instrumentation-intensive test methods. Crack length was continuously
monitored by specimen compliance during up to 2 years of alternate immersion exposure in unfiltered
natural seawater. These wet and dry cycles alternated 6 times a day, and the wet cycle was
approximately 15 minutes long. The back-face strain gauge test method proved reliable for up to 20
months of exposure with a crack growth resolution of approximately 25-50 μm/day.
Alternate immersion SCC testing of high strength materials, steels and nickel-based alloys: UNS
K91973, ASTM(1) A722, UNS S66286, UNS N05500, UNS N07718 API(2) 6A and AMS(3) 5664, and
UNS R30035 is presented. A key finding was that alternate immersion significantly decreased SCC
resistance of some alloys, while other alloys proved to be resistant. Incubation times alternated with
periods of fast crack growth were observed in most cases