Posted by laffineur eric on July 03, 2008 at 12:58:25:
In Reply to: Effect of grain size on hardness posted by Sanjay Deshmukh on July 03, 2008 at 09:27:13:
The problem is due to the thickness of the piece, the kinetic cooling does not allow at core to reach the hardening critical speed.
(see jominy test on google)