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Using Illuminating Gas
The choice of a carburizing furnace depends greatly on the fa...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

The Modern Hardening Room
A hardening room of today means a very different place from ...

Silicon
SILICON is a very widespread element (symbol Si), being an es...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Refining The Grain
This is remedied by reheating the piece to a temperature slig...

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Hardening Operation
Hardening a gear is accomplished as follows: The gear is tak...

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Short Method Of Treatment
In the new method, the packed pots are run into the case-har...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

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



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.





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