This phenomenon has long since become part of the core knowledge about rolled steel. Any article talking about hydrogen blistering will refer to the effects of inclusions and inclusion shapes.

Look also in:
- ASM Handbook (Volume 1 I think, or the Desk Edition)
- Any undergraduate text on material science

Thanks for the reference; I'll look it up if I ever want to go the the source.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

thank you, i was rather looking for "research type" of info. (there is everything and nothing in books.)

the reference below. (no idea if the pdf comes up, doesnt for me.)

• https://files.engineering.com/getfile.aspx?folder=c829c8b6-d597-49d2-995e-e

There are dozens of PhD thesis published each year on this subject. The ranges from the source and composition to modification techniques. You need to search materials research databases and use a variety of search terms.

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P.E. Metallurgy, consulting work welcomed

this is a paper containing 365 references, if anybody should be interested in the future:

http://d-scholarship.pitt.edu/6290/1/M_R_Allazadeh...