MIL-DTL-18295F
test specimens. Impact tests shall be the Charpy V-Notch type as described in ASTM A 370.
The orientation of the impact specimens is shown on figure 17. The test shall be conducted at
32 °F (0 °C). If the average fails to meet the minimum requirement of table I by an amount
greater than 15 percent, three additional specimens from the same bar stock may be tested and the
results added to those previously obtained to form a new average. If the new average fails to
meet the requirements of table I, the represented components shall be rejected. No individual
Charpy values shall be less than 75 percent of the average minimum requirement.
4.6.6 Tensile test. Test samples, as stated in table IV, shall be from finished components and heat
treated the same as the finished component it represents. The test specimen shall come from the
unwelded side (if applicable). One test sample or test coupon for every heat shall be made.
Tensile test specimens may be either the full bar section or the round type machine in accordance
with ASTM A 370. The position of the test specimen relative to the test sample cross section are
to be taken as shown on figure 18. The results of the test shall meet or exceed the minimum
requirements listed in table I. If the original test fails to meet the requirements in table I but is
within 2,000 psi (13 790 kPa) of the required tensile strength, or within 2 percent of the required
elongation or reduction of area, a retest of another specimen selected from the same heat is
permissible. If the second test fails to meet the requirements of table I, the represented
components shall be rejected.
4.6.7 Brinell hardness. Two Brinell hardness tests shall be conducted in accordance with
ASTM E 10. One of the tests shall be conducted on the tensile specimen. The other test shall be
conducted at the locations shown in figures 13, 14, 15, and 16. Prior to testing, the surface (at
the test location) shall be prepared by grinding it down 0.030-inch (0.76 mm) while leaving no
visible marks. Three links in each shot shall be tested. The test links shall be not less than
10 feet (3 m) apart. Failure to meet requirements in table I shall be cause for rejection of the
component.
4.6.8 Surface test. Magnetic particle or liquid dye penetrant inspection shall be employed to
examine the finished component. Five nonadjacent links per shot and every other component shall
be tested. Procedures and equipment shall be used in compliance with MIL-STD-271. The
results of these tests shall be compared with MIL-STD-2035. Failure to meet these specifications
shall be cause for rejection of the represented components.
4.6.9 Microstructure examination.
4.6.9.1 Fusion weldzone of chain and components. A test specimen, as stated in table IV, for
chain and other components shall be prepared and visually inspected in accordance with
ASTM E 3. A sample of material shall be taken parallel with the length of the component,
tranversing the fusion zone. The fusion zone shall be located by acid etching, and a
microstructure examination shall be performed. Evidence of any fissures, microcracks, porosity,
oxides, inclusion, and unfused areas shall be cause for rejection of the represented components
(see 3.4.4 and 3.5).
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