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Hardening
The forgings can be hardened by cooling in still air or quen...

Heating
Although it is possible to work steels cold, to an extent de...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

The Influence Of Size
The size of the piece influences the physical properties obta...

Preventing Decarbonization Of Tool Steel
It is especially important to prevent decarbonization in such...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Effect Of A Small Amount Of Copper In Medium-carbon Steel
This shows the result of tests by C. R. Hayward and A. B. Joh...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Application Of Liberty Engine Materials To The Automotive Industry
The success of the Liberty engine program was an engineer...

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Application To The Automotive Industry
The information given on the various parts of the Liberty eng...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Nickel
Nickel may be considered as the toughest among the non-rare a...

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

Nickel-chromium
A combination of the characteristics of nickel and the charac...



Gears






Category: APPLICATION OF LIBERTY ENGINE MATERIALS TO THE AUTOMOTIVE INDUSTRY

The material used for all gears on the Liberty engine was selected
at the option of the manufacturer from the following standard S.
A. E. steels, the composition of which are given in Table 12,

TABLE 12.--COMPOSITION OF STEELS NOS. X-3,340 AND 6,140

Steel No X-3,340 6,140
Carbon, minimum 0.350 0.350
Carbon, maximum 0.450 0.450
Manganese, minimum 0.450 0.500
Manganese, maximum 0.750 0.800
Phosphorus, maximum 0.040 0.040
Sulphur, maximum 0.045 0.045
Nickel, minimum 2.750
Nickel, maximum 3.250
Chromium, minimum 0.700 0.800
Chromium, maximum 0.950 1.100
Vanadium, minimum 0.150

All gears were heat-treated to a scleroscope hardness of from 55
to 55. The heat treatment used to secure this hardness consisted
in quenching the forgings from a temperature of 1,550 to 1,600 deg.F.
in oil and annealing for good machineability at a temperature of
from 1,300 to 1,350 deg.F. Forgings treated in this manner showed a
Brinell hardness of from 177 to 217.





Next: Rate Of Cooling

Previous: Highly Stressed Parts



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