Hi,
I have a superalloy tubing which has been severely deformed and heat
treated. I suspect there is large residual stress. I found from literature
that XRD is a reliable way to measure the residual strain. I read about
the sin2(psi) method, but the exact measurement procedure is still not
clear to me.
I have tried to run theta-2theta scans on the tubing cross-section and
observed difference in lattice spacings at different locations. But I was
not sure these results are reliable, because there may be considerable
stress relaxation at the surface? It is also known that the surface
finishing results in significant additional residual strain. Could anyone
give me advice as how the surface should be prepared?
Please advise on those issues or point me to the book or papers where I
can find the answer.
Thank you in advance!
Jun
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