Here's some FYI on Hydrogen Embrittlement,
http://www.google.co...ql=&oq=&gs_rfai=
Or just "google" embrittlement.
With regard to the Ford recommendation that axles not be heated and straightened, I think that refers to rear axle shafts rather than front axles.
Both the early Ford front axles and rear axle shafts were forgings. I suggest Ford recommended against heating and straightening rears due to the potential for not getting the rear axles properly straight thereby causing early bearing failure and the weakening (loss of heat treat) ending in axle failure due to improper heating to attempt to straighten.
I'm guessing the front axles were not been heat treated as the strength of the basic forging was sufficient for mission profile.
I have access to Rockwell test equipment and if I can spare a few little grey cells from this evening's wine saturation, I'll try to remember to take a spindle with me and ping it in a couple of places.
Hey RPM, I was contemplating shot peening, but my 12 guage would scare my dogs. I could vibration stress relieve'em by throwing'em in the back on my car and driving out to the higway on my dirt road a couple of times. Our road up to the highway is soooo f-ing rough.....
How rough is it?
It's so rough....... I was thinking about asking the county if they would give me a permit to run helicopter tours up and down it on the weekends.