ASTM B406-96(2000)
(Test Method)Standard Test Method for Transverse Rupture Strength of Cemented Carbides
Standard Test Method for Transverse Rupture Strength of Cemented Carbides
SCOPE
1.1 This test method covers the determination of the transverse rupture strength of cemented carbides.
1.2 The values stated in inch-pound units are to be regarded as the standard. The SI values in parentheses are provided for information only.
1.3 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:B406–96 (Reapproved 2000)
Standard Test Method for
Transverse Rupture Strength of Cemented Carbides
This standard is issued under the fixed designation B 406; 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. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope material. This imparts a statistical nature to any transverse
2 rupture strength measurement.
1.1 This test method covers the determination of the
3.1.2 Thestressdistributioninabeaminthree-pointloading
transverse rupture strength of cemented carbides.
is non-uniform. It increases linearly along the span to a
1.2 The values stated in inch-pound units are to be regarded
maximum at the center, and varies linearly through any section
as the standard. The SI values in parentheses are provided for
from compression on the top to tension on the bottom. The
information only.
maximum tensile stress therefore occurs at center span in the
1.3 This standard does not purport to address the safety
bottom most fibers of the sample, and is defined as the
concerns, if any, associated with its use. It is the responsibility
transverse rupture strength at failure. Failure is initiated at a
of the user of this standard to establish appropriate safety and
random flaw site, which is most probably not coincident with
health practices and determine the applicability of regulatory
the maximum stress. This imparts an additional statistical
limitations prior to use.
nature to transverse rupture strength measurements.
2. Referenced Documents
4. Apparatus
2.1 ISO Standard:
4.1 Either a specially adapted machine for applying the load
ISO-3327 Hardmetals—Determination of Transverse Rup
or a special fixture suitable for use with a conventional
ture Strength
load-applying machine may be used. In either case, the
3. Significance and Use
apparatus shall have the following parts:
4.1.1 Two ground-cemented-carbide cylinders 0.250 6
3.1 This test method is used as a means of determining the
0.001 in. (6.35 6 0.02 mm) in diameter, at least 0.500 in. (13
quality of cemented carbide grade powders by measuring their
mm) in length with the long axes parallel, and center to center
sintered strength. It is performed on test specimens prepared to
spacing of 0.5636 0.005 in. (14.3 6 0.1 mm).
specified shape, dimensions, and surface finish; test specimens
4.1.2 Amovablemember(freetomovesubstantiallyonlyin
may be prepared from finished parts if size permits.There is no
a line perpendicular to the plane established by the axes of the
known standard material for this test method. The transverse
two cylinders) containing a 0.4 6 0.05-in. (10 6 1.3-mm)
rupture strength of cemented carbides is not a design value.
cemented-tungsten-carbide ball or a ground-cemented-carbide
3.1.1 Most commercial cemented carbides have mechanical
cylinder of the same dimensions as, and with axis parallel to,
behavior that is best classified as brittle (negligible ductility).
those of the two previously mentioned cylinders (see 4.1.1).
Fracture strengths are dependent on internal or surface flaws.
This ball or cylinder shall be so positioned that movements of
Examples of incoherent internal flaws are macropores, Type B
the member will cause the ball or cylinder to contact a
porosity, and inclusions of foreign particles. Such flaws are
specimen placed on the two lower cylinders at the midpoint of
randomly distributed spatially and in size within the sintered
the span between them.
4.1.3 The apparatus shall be so constructed that the appli-
This test method is under the jurisdiction of ASTM Committee B09 on Metal
cation of a sufficient load to the movable member to effect
Powders and Metal Powder Products and is the direct responsibility of Subcom-
breaking of a specimen will not cause appreciable deflection of
mittee B09.06 on Cemented Carbides.
the line of movement of the movable member and the plane
Current edition approved Sept. 10, 1996. Published November 1996. Originally
published as B 406 – 63 T. Last previous edition B 406 – 95. established by the two fixed cylinders. The apparatus shall be
This test method is comparable to ISO-3327.
capable of applying sufficient load to break the specimen. The
Available from American National Standards Institute, 11 W. 42nd St., 13th
apparatus shall be capable of registering the load required
Floor, New York, NY 10036.
(within 61 % of the load) to break the specimen. The
See ASTM Standard B 276 Test Method for Apparent Porosity in Cemented
Carbides, published in Vol 02.05 of the Annual Book of ASTM Standards.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B406
cemented-tungsten-carbide ball and cylinders shall not show 7.4 Five specimens shall be tested.
permanent deformation after use.
8. Calculation
5. Specimen Size
8.1 Calculate the transverse rupture strength as follows:
5.1 The cemented carbide specimens shall be ground to the
S 5 3PL/2bh (1)
following dimensions: 0.200 6 0.010 in. (5.00 6 0.25 mm)
thick by 0.250 6 0.010 in.
...
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