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

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

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

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

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

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

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Critical Points
One of the most important means of investigating the properti...

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

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

Steel Before The 1850's
In spite of a rapid increase in the use of machines and the ...

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

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

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

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

Lathe And Planer Tools
TO FORGE.--Gently warm the steel to remove any chill is parti...

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

Properties Of Steel
Steels are known by certain tests. Early tests were more or l...

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

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



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peg was withdrawn and quenched at each of the temperatures indicated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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Previous: S A E Heat Treatments



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