Solid state transformations - reduction in thickness

[cespi82]

Good day for all...

I have a very experienced colleague in the refinery I work on that is affirming that Solid State Transformations also cause thickness reduction.

Is this affirmation correct?

The situation is that we have a failure in one steam generator tube (convection section) and the same has an important internal thickness reduction of 0.23" in three years (T actual = 0.07/ T nom = 0.3) in the part of tube looking at the fire side. It also have a small bulging with a crack through. He is attributing the failure to Short Term Overheating and Steam Blanketing which sounds reasonable but I asked about the thickness reduction and his answer was that the excess of heat could have caused a solid state transformation and subsequently a thickness reduction. That last statement made a lot of noise in my head so I bring this to you to get your input and opinions.

I attached a picture of part of his report.

Kind regards,

 

[metengr]

Local deformation from stress rupture would cause the observed local thinning.

 

[Guest102023]

What is your colleague experienced at? I don't suspect it is metallurgical failure analysis.

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