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

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

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

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

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

S A E Heat Treatments
The Society of Automotive Engineers have adopted certain heat...

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

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

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

The Quenching Tank
The quenching tank is an important feature of apparatus in c...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

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



Heat Treatment Of Axles






Category: APPLICATION OF LIBERTY ENGINE MATERIALS TO THE AUTOMOTIVE INDUSTRY

Parts of this general type should be heat-treated to show the following
minimum physical properties: Elastic limit, 115,000 lb. per square
inch; elongation in 2 in., 16 per cent; reduction of area, 50 per
cent; Brinell hardness, 277 to 321.

The heat treatment used to secure these physical properties consists
in quenching from a temperature of from 1,520 to 1,540 deg.F. in water
and tempering at a temperature of from 975 to 1,025 deg.F. Where the
axle shaft is a forging, and in the case of steering knuckles and
arms, this heat treatment should be preceded by normalizing the
forgings at a temperature of from 1,550 to 1,600 deg.F. It will be
noted that these physical properties correspond to those worked
out for an ideal aviation engine crankshaft. If parts of this type
are designed with proper sections, so that this range of physical
properties can be used, the part in question will give maximum
service.

One of the most important developments during the Liberty engine
program was the fact that it is not necessary to use a high-analysis
alloy steel to secure a finished part which will give proper service.
This fact should save the automotive industry millions of dollars
on future production.

If the proper authority be given the metallurgical engineer to
govern the handling of the steel from the time it is purchased
until it is assembled into finished product, mild-analysis steels
can be used and the quality of the finished product guaranteed.
It was only through the careful adherence to these fundamental
principles that it was possible to produce 20,000 Liberty engines,
which are considered to be the most highly stressed mechanism ever
produced, without the failure of a single engine from defective
material or heat treatment.





Next: Making Steel Balls

Previous: Composition Of Transmission-gear Steel



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