ASTM B406-96

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.

General Information

• Status: Historical
• Publication Date: 31-Dec-1999
• Technical Committee: B09 - Metal Powders and Metal Powder Products
• Drafting Committee: B09.06 - Cemented Carbides

Relations

• Replaced By: ASTM B406-96(2000) - Standard Test Method for Transverse Rupture Strength of Cemented Carbides
• Effective Date: 01-Jan-2000
• Referred By: ASTM B528-16(2020)e1 - Standard Test Method for Transverse Rupture Strength of Powder Metallurgy (PM) Specimens
• Effective Date: 01-Jan-2000
• Referred By: ASTM B930-03(2021) - Standard Test Method for Rating Grain Size and Frequency of Abnormally Large Grains in Cemented Tungsten Carbides (Hardmetals)
• Effective Date: 01-Jan-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 406 – 96
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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.
1. Scope from compression on the top to tension on the bottom. The
maximum tensile stress therefore occurs at center span in the
1.1 This test method covers the determination of the
bottom most fibers of the sample, and is defined as the
transverse rupture strength of cemented carbides.
transverse rupture strength at failure. Failure is initiated at a
1.2 The values stated in inch-pound units are to be regarded
random flaw site, which is most probably not coincident with
as the standard. The SI values in parentheses are provided for
the maximum stress. This imparts an additional statistical
information only.
nature to transverse rupture strength measurements.
1.3 This standard does not purport to address the safety
concerns, if any, associated with its use. It is the responsibility
4. Apparatus
of the user of this standard to establish appropriate safety and
4.1 Either a specially adapted machine for applying the load
health practices and determine the applicability of regulatory
or a special fixture suitable for use with a conventional
limitations prior to use.
load-applying machine may be used. In either case, the
2. Referenced Documents apparatus shall have the following parts:
4.1.1 Two ground-cemented-carbide cylinders 0.250 6
2.1 ISO Standard:
0.001 in. (6.35 6 0.02 mm) in diameter, at least 0.500 in. (13
ISO-3327 Hardmetals—Determination of Transverse Rup
mm) in length with the long axes parallel, and center to center
ture Strength
spacing of 0.5636 0.005 in. (14.3 6 0.1 mm).
3. Significance and Use
4.1.2 A movable member (free to move substantially only in
a line perpendicular to the plane established by the axes of the
3.1 This test method is used as a means of determining the
two cylinders) containing a 0.4 6 0.05-in. (10 6 1.3-mm)
quality of cemented carbide grade powders by measuring their
cemented-tungsten-carbide ball or a ground-cemented-carbide
sintered strength. It is performed on test specimens prepared to
cylinder of the same dimensions as, and with axis parallel to,
specified shape, dimensions, and surface finish; test specimens
those of the two previously mentioned cylinders (see 4.1.1).
may be prepared from finished parts if size permits. There is no
This ball or cylinder shall be so positioned that movements of
known standard material for this test method. The transverse
the member will cause the ball or cylinder to contact a
rupture strength of cement carbides is not a design value.
specimen placed on the two lower cylinders at the midpoint of
3.1.1 Most commercial cemented carbides have mechanical
the span between them.
behavior that is best classified as brittle (negligible ductility).
4.1.3 The apparatus shall be so constructed that the appli-
Fracture strengths are dependent on internal or surface flaws.
cation of a sufficient load to the movable member to effect
Examples of incoherent internal flaws are macropores, Type B
breaking of a specimen will not cause appreciable deflection of
porosity, and inclusions of foreign particles. Such flaws are
the line of movement of the movable member and the plane
randomly distributed spatially and in size within the sintered
established by the two fixed cylinders. The apparatus shall be
material. This imparts a statistical nature to any transverse
capable of applying sufficient load to break the specimen. The
rupture strength measurement.
apparatus shall be capable of registering the load required
3.1.2 The stress distribution in a beam in three-point loading
(within 61 % of the load) to break the specimen. The
is non-uniform. It increases linearly along the span to a
cemented-tungsten-carbide ball and cylinders shall not show
maximum at the center, and varies linearly through any section
permanent deformation after use.
5. Specimen Size
This test method is under the jurisdiction of ASTM Committee B-9 on Metal
Powders and Metal Powder Products and is the direct responsibility of Subcom-
5.1 The cemented carbide specimens shall be ground to the
mittee B09.06 on Cemented Carbides.
following dimensions: 0.200 6 0.010 in. (5.00 6 0.25 mm)
Current edition approved Sept. 10, 1996. Published November 1996. Originally
published as B 406 – 63 T. Last previous edition B 406 – 95. thick by 0.250 6 0.010 in. (6.25 6 0.25 mm) wide by 0.750 in.
This test method is comparable to ISO-3327.
(19.0 mm) minimum long.
Available from American National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036.
6. Specimen Preparation
See ASTM Standard B 276 Test Method for Apparent Porosity in Cemented
Carbides, pu
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