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Jominy Testing

Jominy Test 1

Testing performed in accordance with ASTM A 255.

The influence of composition on the ability of steel alloy to transform to martensite for a particular quenching treatment is related to a parameter called hardenability. For every different steel alloy, there is a specific relationship between the mechanical properties and the cooling rate.  Hardenability is used to describe the ability of an alloy to be hardened by the formation of martensite as a result of a given heat treatment. One standard procedure that is widely utilized to determine hardenability is the Jominy end quench test. The heating and cooling treatment of the steel specimens has a great effect on the phase of the microstructure of the steel specimen.

Jominy Test 1

The addition of alloys or coarsening of the austenitic grain structure increase the hardenability of steel.

Any steel that has a low critical cooling rate will harden deeper than one that has a high cooling rate of quenching.  The size of the part that is being quenched has a direct effect upon the hardenability of the material.