[SuperMacGuy]

I was at Summit Point yesterday for FATT. During my 2nd heat I had my left front hub fail. It let loose in turn 5-6 or so, and if you know Summit, that's about the slowest part of the track. Which is right after the part of the track with the highest pucker factor IMO (downhill at 80-100 depending, about a 30 degree turn a little off camber and max braking soon as you're through it). So I am OK and there is no body damage.
The hub flange sheared right off, and the wheel getting pushed back it must have bent up either the brake caliper or the slide pins, the caliper doesn't float any more. A guy with a TA next to me thankfully had a spare hub, so I got that on and drove carefully home. This was a Mike Minear hub so I'm contacting him to see if he wants to inspect it. I'll probably get a new one from him over the winter.
I'm thankful that was all relatively low drama. If that happened almost anywhere else on track, well all the other places are pretty high speed, and it would've been a real wreck, literally.

Chris

[StanIROCZ]

Also, having a case and core in a part should perform better than just through hardening because of favorable residual stresses - compressive residual stress on the surface balanced by tensile residual stress in the core. Since materials almost always fail in tension having compressive residual stress in the high stress areas (the surface) will reduce the effective stress which will increase the fatigue life.

I can't remember what the hardess was of your part but the case carburized part will most cerntainly be harder = another advantage, Tensile stregth for HRC60 = 300 ksi.

Some more data supporting a case hardened part: The only axle parts that I know of that are through hardened are parts that primarly only see compressive stress = bearings. Axle shafts are induction hardened (case and core).