ASTM B886-03

Standard Test Methods for Determination of Magnetic Saturation (Ms) of Cemented Carbides

SIGNIFICANCE AND USE
This test method allows the non-destructive measurement of the magnetic fraction of the binder phase in cemented carbide powder materials and sintered product, and may be used as an indirect measure of the carbon level in the material or product.
Measurement of magnetic saturation provides a comparison of the relative fraction of magnetic binder phase that is, cobalt, nickel, or iron, present in the material and can be used for acceptance of product to specification.
Measurement of magnetic saturation can be used as a measure of the quality of powder material.
SCOPE
1.1 This test method covers the determination of magnetic saturation (Ms) of cemented carbide powder materials and sintered products using magnetic saturation induction test instrumentation.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of 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: 09-Apr-2003
• ICS: 77.040.20 - Non-destructive testing of metals
• Technical Committee: B09 - Metal Powders and Metal Powder Products
• Drafting Committee: B09.06 - Cemented Carbides

Relations

• Replaces: ASTM B886-98 - Standard Test Methods for Determination of Magnetic Saturation (Ms) of Cemented Carbides
• Effective Date: 10-Apr-2003
• Replaced By: ASTM B886-03(2008) - Standard Test Method for Determination of Magnetic Saturation (Ms) of Cemented Carbides
• Effective Date: 01-Apr-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:B886–03
Standard Test Method for
Determination of Magnetic Saturation (Ms) of Cemented
1
Carbides
This standard is issued under the fixed designation B 886; 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 * induces a d-c current to flow in the sensing coils of the test
apparatus.The induced currect is proportional to the amount of
1.1 This test method covers the determination of magnetic
magenetic binder phase present in the test specimen. Measure-
saturation (Ms) of cemented carbide powder materials and
ment of the induced current permits calculation of the intrinsic
sintered products using magnetic saturation induction test
magnetic saturation of the test sample.
instrumentation.
1.2 The values stated in SI units are to be regarded as the
5. Significance and Use
standard.
5.1 This test method allows the non-destructive measure-
1.3 This standard does not purport to address all of the
ment of the magnetic fraction of the binder phase in cemented
safety concerns, if any, associated with its use. It is the
carbide powder materials and sintered product, and may be
responsibility of the user of this standard to establish appro-
used as an indirect measure of the carbon level in the material
priate safety and health practices and determine the applica-
or product.
bility of regulatory limitations prior to use.
5.2 Measurement of magnetic saturation provides a com-
2. Referenced Documents parison of the relative fraction of magnetic binder phase that is,
cobalt, nickel, or iron, present in the material and can be used
2.1 ASTM Standards:
for acceptance of product to specification.
A 340 Terminology of Symbols and Definitions Relating to
2
5.3 Measurement of magnetic saturation can be used as a
Magnetic Testing
3
measure of the quality of powder material.
B 243 Terminology of Powder Metallurgy
4
E 1316 Terminology for Nondestructive Examinations
6. Interferences
3. Terminology 6.1 No direct absolute measurement of magnetic saturation
can be made. The measurement is a relative comparison of
3.1 Definitions:
standard reference materials.
3.1.1 For definition of terms used in this procedure refer to
6.2 Measurement of magnetic saturation is a non-
Terminology A 340, Terminology B 243, and Terminology
destructive “bulk” measurement which is averaged over the
E 1316.
test specimen volume. The technique cannot be used to infer
3.1.2 dc—direct current.
anything regarding the relative distribution of the binder phase
4. Summary of Test Method
within the test sample.
6.3 Measurement of magnetic saturation is affected by test
4.1 A test specimen is statically positioned in the magnetic
sample size and shape, especially aspect ratio, and the compo-
field generated by d-c coils or a permanent magnet and sensing
sition of the binder phase, that is, a mixture of ferromagnetic
coils of the test apparatus. The specimen is magnetized to
elements of varying intrinsic magnetic moments
induction saturation by the field and translated linearly that the
6.4 Small test samples or test samples containing relatively
intrinsic magnetic moment of the specimen’s binder phase
low concentrations of the binder phase may be immeasurable
in that the low concentration prohibits detection by the field
1
This test method is under the jurisdiction of ASTM Committee B09 on Metal
sensing coils of the specific apparatus employed.
Powders and Metal Powder Products and is the direct responsibility of Subcom-
mittee B09.06 on Cemented Carbides.
7. Apparatus
Current edition approved April 10, 2003. Published May 2003. Originally
7.1 Instrumentation capable of inducing magnetic saturation
approved in 1998. Last previous edition approved in 1998 as B 886–98.
2
Annual Book of ASTM Standards, Vol 03.04.
and then sensing the inherent intrinsic magnetic moment of the
3
Annual Book of ASTM Standards, Vol 02.05.
magnetic fraction of the binder phase.
4
Annual Book of ASTM Standards, Vol 03.03.
*A Summary of Changes section appears at the end of this standard.
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B886–03
7.2 Balance having a capacity of 200 g and a sensitivity of given to the composition of the binder phase with respect to
0.001 g. ferromagnetic components, and the presence of other metallic
constituents, for example, chromium (Cr) in the powder
8. Standards
material or sintered product, that would affect the binder phase
8.1 No certified cemented carbide standards, powder mate-
composition or magnetic moment
...