What possible damage mechanism rather than hydrogen em belittlement or HIC , if the secondary crack pass through ferrite of duplex only and principal crack is trans granular,
Sulphide Stress Cracking Corrosion that happens due to H2S. Ferrite content and duplex due to having ferrite content are more vulnerable to this type of attack compared to austenitic phase.
Yes but no any source for H2Sin that process, we need to know about hydrogen embrittlement in duplex ,what is possible sources of H2 from manufacturer it could be ??