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Jominy Test Fixtures


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Jominy Test Fixtures
( Models:MJOM-25 )
Jominy Test Fixtures

  The most commonly used method for determining harden ability is the     end quench test developed by Jominy & Boegehold.
  In this test a normalized 25 mm diameter & 100 mm length test sample     of steel to be evaluated is heated uniformly to its austenitizing     temperature. The specimen is then removed from the furnace & placed in     the end quench test apparatus & immediately end quenched by a jet of     room temperature water.
  After end quenching, longitudinal flat surfaces are ground on opposite     sides of the test piece as per dimensions. This grinding is very important     for correct positioning of the sample in the fixture and also for accurate     repeatable and reliable test results.
  Jominy Test Fixture is to be positioned on the main screw of the hardness     tester for checking hardness of the test sample. Hardness at equal     intervals (1 mm or 1/16') to be checked and noted. Plot the resulting
    data on graph paper with hardness value as ordinate (Y axis) and
    distance from the quenched end as abscissa (X axis). By comparing
    the curves resulting from end quench tests of different grades of steels,     their relative harden ability can be established. Thus the flatter the curve,     the greater the harden ability.
  The details of the test are covered in IS : 3848-1981 & ASTM : A 255.

 
 
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