MIL-DTL-14824C(AR)
4.4 Testing.
4.4.1 Visual examination for material defects. The internal
cavity of the projectile shall be inspected visually prior to
nosing using probe lighting to assure conformance with 3.5.
Visual standards in accordance with 3.5 shall be set up for use
during this inspection. Any projectile failing to meet the
applicable requirements of 3.5 shall be classed defective and
removed from the lot.
4.4.2 Mechanical properties of the projectile body.
4.4.2.1 Hardness. Each final heat treated projectile from a
heat treated lot shall be identified and subjected to a hardness
test on the surface between the rear of the rotating band seat to
1/2 inch forward of the rotating band. One (1) hardness reading
shall be taken. The hardness reading obtained shall be used as
the basis for selecting the tension test sample of paragraph
4.4.2.2.
4.4.2.1.1 Hardness test. The hardness test shall be
conducted in accordance with ASTM Method E103 and the following:
a. The surface of the body in the area designated to be
hardness tested shall be prepared by grinding a flat to a
sufficient depth, .015 inch minimum, to remove scale and get
below the decarburization zone. The preparation process to be
used shall require approval as part of the AIE submittal. Manual
grinding shall not be used. The surface preparation requirement
may be eliminated if the conditions of 6.12 are met.
b. Hardness tester periodic verification shall be performed
using Brinell test standards manufactured in accordance with ASTM
E10 methods in lieu of production samples.
c. The hardness tester shall use a standard 10mm Brinell
ball. The body shall be securely supported so that no rocking or
shifting of the body will occur during the test. The tester
shall apply a preload followed by application of the full load.
The preload shall not exceed 10% of the major load of 3000kg.
The amount of penetration of the indenter (10mm ball) during that
time period when the major load is applied including the dwell
time at the end of the load application shall be automatically
measured. The tester shall be provided with a means to
compensate for any flexing of the test item that may occur during
application of the major load. The hardness number will be
displayed at the conclusion of the test.
d. One hardness reading shall be taken.
e. All hardness test measurements shall be automatically
recorded.
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