TVP - I thought it was a review article when I first read it but the more I look at the affiliation of the author the more I think it is advertizing blurb!
damienk - The implication of the question is that this has already been done - the particles are ferro-magetic and electricpete is trying to identify the source.
Fred
Apologies - I used the word "molecular" to describe the scale of possible observations not any particular kind of structure.
Maybe I should have worded my comments as follows - with my relatively antiquated electron microscope I can see the atoms and crystallographic structure of...
Call me an old fashioned sceptic if you like but I have a hard time with "something happening in the sub microstructure that is not well understood". Fifty years ago metallurgists could say that sub-microscopic particles were responsible for mechanisms such as age hardening but with...
General information is in the ASM Handbook on Heat Treating.
Specific requirements depend on the applications - for example gear teeth case depth recommendations are included in AGMA 2001.
There is a second risk with a "partial" repair which is associated with a mechanism known as strain age embrittlement. I don't know if your alloy is susceptible to this but in those which are, the strain and temperature cycle imposed on the buried crack during the welding operation...
Depending on where the specific batch of material falls within the specification chemical analysis ranges all three of these alloys can be magnetic. The only way to be certain is to use one of the portable analysis machines and carry out a Positive Material Identification (PMI.
