Theory 022/Materials Processing
Forging Stress Is Chill Depth
The claim
Residual stress in a forging is set by the depth of die chilling during the final blows rather than by the overall forging load.
01The mechanism
A cold skin resists contraction relative to the hot core, which produces the stress pattern; depth of that skin sets magnitude.
02Predictions
- P1Stress should track chill depth.
- P2Load changes at fixed chill should matter less.
03Refutation
Stress tracking forging load would remove the chill mechanism.