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Furnace Data
In order to give definite information concerning furnaces, fu...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Highly Stressed Parts
The highly stressed parts on the Liberty engine consisted of ...

Calibration Of Pyrometer With Common Salt
An easy and convenient method for standardization and one whi...

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

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

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...

Testing And Inspection Of Heat Treatment
The hard parts of the gear must be so hard that a new mill f...

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

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

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...

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

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...

Heat Treatment Of Gear Blanks
This section is based on a paper read before the American Gea...

The Effect
The heating at 1,600 deg.F. gives the first heat treatment w...

Gears
The material used for all gears on the Liberty engine was sel...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

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



The Effect






Category: HEAT TREATMENT OF STEEL

The heating at 1,600 deg.F. gives the first heat treatment
which refines the core, which under the former high heat (1,700 deg.F.)
was rendered coarsely crystalline. All the gears, including the
scrap gears, are quenched direct from the pot in this manner.

The gears then go to the reheating furnaces, situated in front of
a battery of Gleason quenching machines. These furnaces accommodate
from 12 to 16 crown gears. The carbon-steel gears are heated in a
reducing atmosphere to about 1,425 deg.F. (depending on the carbon
content) placed in the dies in the Gleason quenching machine, and
quenched between dies in mineral oil at less than 100 deg.F. The test
gear receives exactly the same treatment as the others and is then
broken, giving a record of the condition of both case and core.





Next: Affinity Of Nickel Steel For Carbon

Previous: Short Method Of Treatment



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