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

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

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

Temperature Recording And Regulation
Each furnace is equipped with pyrometers, but the reading an...

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

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

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Hardening High-speed Steels
We will now take up the matter of hardening high-speed steels...

Quenching Tool Steel
To secure proper hardness, the cooling of quenching of steel ...

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

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

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

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

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

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

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



Impact Tests






Category: COMPOSITION AND PROPERTIES OF STEEL

Impact tests are of considerable importance as an indication of
how a metal will perform under shock. Some engineers think that
the tensile test, which is one made under slow loading, should
therefore be supplemented by another showing what will happen if
the load is applied almost instantaneously. This test, however, has
not been standardized, and depends to a considerable extent upon
the type of machine, but more especially the size of the specimen
and the way it is nicked. The machine is generally a swinging
heavy pendulum. It falls a certain height, strikes the sample at
the lowest point, and swings on past. The difference between the
downward and upward swing is a measure of the energy it took to
break the test piece.





Next: Fatigue Tests

Previous: Tensile Properties



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