04-02-2018, 05:01 PM
(This post was last modified: 04-02-2018, 05:09 PM by scott.livesey.)
some quick thoughts
yes grain refinement can be helpful. yes I read pg. 69 in the Verhoven book and saw the table. you need to go just a step further and read the reference. Grange patented his grain refinement techniques in 1965. this is part of the fine print we may have missed:
In practicing our invention, it is necessary that the heating be done quite rapidly but once the desired rate is obtained on further advantage results from exceeding such rate by extremely fast heating. In thicknesses up to 0.5 inch, satisfactory results can be obtained by leadbath heating but other types of liquid baths, such as salts, or electrical induction or resistance heating may be used. The heating time should be less than 60 seconds and preferably less than 20 seconds. In such thicknesses as .03 to .50 inch, the same ultrafine grain size was obtained upon heating in a lead bath from 10 to 20 seconds. ref: https://patents.google.com/patent/US3178324
scott
yes grain refinement can be helpful. yes I read pg. 69 in the Verhoven book and saw the table. you need to go just a step further and read the reference. Grange patented his grain refinement techniques in 1965. this is part of the fine print we may have missed:
In practicing our invention, it is necessary that the heating be done quite rapidly but once the desired rate is obtained on further advantage results from exceeding such rate by extremely fast heating. In thicknesses up to 0.5 inch, satisfactory results can be obtained by leadbath heating but other types of liquid baths, such as salts, or electrical induction or resistance heating may be used. The heating time should be less than 60 seconds and preferably less than 20 seconds. In such thicknesses as .03 to .50 inch, the same ultrafine grain size was obtained upon heating in a lead bath from 10 to 20 seconds. ref: https://patents.google.com/patent/US3178324
scott