One method of applying hardenability data is to make an experimental part from a steel for which the end cooled hardenabilty has been determined. A hardness traverse is made from the surface to the center of the part and the measrements obtained are compared to measurements obtained from the end cooled bar. It may be assumed that points of equal hardness will have the same cooling rate and the cooling rate can then be determined at the various points from the surface to the center of the part.

When dealing with IRON there is a chilling process in which carbon is retained in it's combined form in desired areas so that a mottled structure is obtained. To accomplish this cooling is accelerated to the extent normal graphitization does not occur in those areas.
This of course is not the cryogenic processs referred to.


The AGING process Ford employed has been mistermed as Normalizing or Stress relieving at times. The practice was to allow the iron to recover from the casting /quenching process. There is a marked change in physical properties over time ,even at room temperatures.The precipitated change in structure is often submicroscopic. The main benefit is improved structural stability.
The process may be accelerated by heating

I was primarily an EE but next year when I quit my current job I will be working as an ME/EE .