Method for Diametral Compression Testing of Cemented Carbides (Withdrawn 1983)

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ASTM B485-76 - Method for Diametral Compression Testing of Cemented Carbides (Withdrawn 1983)
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AMERICAN NATIONAL ANSI/ ASTM B 485 - 76
STANDARD .
AMERICAN SOCIETY FOR TESYING AND MATERIALS
1916 Race St., Phlladelphla, Pa., 19103
Standard Method for
DIAMETRAL COMPRESSION TESTING OF
1
CEMENTED CARBIDES
This Standard is issued under the fixed designation B 485; the number immediately following the designation indicates
the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the
year of last reapproval.
1. Scope 3. Test Specimens
1.1 This method provides a procedure for 3.1 The cemented carbide specimens shall
determining the diametral compression (ra­
be unground and shall have the following di­
dial crushing) strength of cemented carbides mensions: 0.750 ± 0.005 in. (19.0 ± 0.15 mm)
2
which is a measure of tensile strength.
outer diameter by 0.450 ± 0.005 in. (11.5 ±
0.15 mm) inside diameter by 0.250 ± 0.005 in.
NOTE-The values stated in U.S. customary units
are to be regarded as the standard.
(6.5 ± 0.15 mm) thick. The taper on any di­
mension shall not exceed 0.002 in. (0.05 mm).
2. Apparatus
The specimens shall be cleaned of furnace
2.1 Either a specially adapted machine for residue by a light sandblasting operation or
applying the load or a fixture suitable for use
similar treatment.
with a conventional load-applying machine 3.2 Visually examine the specimens for ob­
may be used. In either case, the apparatus vious defects such as cracks, chips, excessive
shall have the following parts: distortion or taper, and adhering foreign ma­
2.1.1 Two ground, cemented-carbide plates
terial. Reject defective specimens.
1.000 in. (25 mm) in diameter and at least ·~/s
3.3 Each specimen shall be measured on
in. (10 mm) thick. These. are mounted in op­
all dimensions to wit'1in ±0.001 in. (0.03 mm).
posite members of the assembly to provide the
4. Procedure
pressure pads.
2.1.2 One fixed and one movable member 4.1 Place a specimen into the fixture so that
(free to move substantially only in a line per­
it is held lightly on edge between the two
pendicular to the plane of the pressure pads).
cushion strips. Then adjust the movable mem­
2.2 The apparatus shall be so constructed ber so that the specimen assembly is held
that the application of a sufficient load to the
without pressure between the two cemented
movable member, to effect breaking of the carbide pads.
specimen, will not cause appreciable deflec­
4.2 Apply the load at a rate not exceeding
tion of the line of movement of the movable
350 lbf (1.5 kN)/s. Remove the load
...

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