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

Machineability
Reheating for machine ability was done at 100 deg. less than ...

Tempering Colors On Carbon Steels
Opinions differ as to the temperature which is indicated by t...

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

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

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

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

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

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

Open Hearth Process
The open hearth furnace consists of a big brick room with a l...

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Placing Of Pyrometers
When installing a pyrometer, care should be taken that it re...

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

Cyanide Bath For Tool Steels
All high-carbon tool steels are heated in a cyanide bath. Wi...

Molybdenum
Molybdenum steels have been made commercially for twenty-five...

Impact Tests
Impact tests are of considerable importance as an indication ...



Restoring Overheated Steel






Category: HARDENING CARBON STEEL FOR TOOLS

The effect of heat treatment on overheated steel is shown graphically
in Fig. 65 to the series of illustrations on pages 137 to 144. This
was prepared by Thos. Firth & Sons, Ltd., Sheffield, England.



The center piece Fig. 65 represents a block of steel weighing about
25 lb. The central hole accommodated a thermo-couple which was attached
to an autographic recorder. The curve is a copy of the temperature
record during heating and cooling. Into the holes in the side of
the block small pegs of overheated mild steel were inserted. One
peg was withdrawn and quenched at each of the temperatures indicated
by the numbered arrows, and after suitable preparation these pegs
were photographed in order to show the changes in structure taking
place during heating and cooling operations. The illustrations here
reproduced are selected from those photographs with the object
of presenting pictorially the changes involved in the refining of
overheated steel or steel castings.





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