Stress corrosion crack initiation testing with tapered specimens in high-temperature water – Results of a collaborative research project

Rik-Wouter Bosch, Stefan Ritter, Matthias Herbst, Renate Killan, M.Grace Burke, Jonathan Duff, Fabio Scenini, Yuchen Gu, Alice Dinu, Ulla Ehrnstén, Aki Toivonen, Radek Novotny, Oliver Martin, Francisco-Javier Perosanz, Andraz Legat, Bojan Zajec

Research outputpeer-review


The applicability of an accelerated test technique using tapered tensile specimens for investigating the stress corrosion crack (SCC) initiation behaviour of structural materials in high-temperature water was assessed in the framework of a European collaborative research project (MICRIN – MItigation of CRack INitiation). The main advantage of using a tapered geometry is, that in a single test a stress gradient is obtained through the gauge length, and therefore a stress threshold for SCC initiation can be determined in a reasonable timeframe. This method was used to investigate two different materials that were known to be susceptible to SCC in light water reactor environment: a high-Si stainless steel and a Ni-base weld metal (Alloy 182). The results of the international test programme confirmed that the tapered specimen test methodology could be used to identify a SCC initiation stress threshold, albeit that significant scatter was present in the data.
Original languageEnglish
Pages (from-to)106-118
Number of pages16
JournalCorrosion Engineering, Science and Technology
Issue number2
StatePublished - 2021

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