ASTM B886-12

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Designation: B886 − 12
Standard Test Method for
Determination of Magnetic Saturation (Ms) of Cemented
1
Carbides
This standard is issued under the fixed designation B886; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Summary of Test Method
1.1 This test method covers the determination of magnetic
4.1 A test specimen is statically positioned in the magnetic
saturation (Ms) of cemented carbide powder materials and field generated by dc coils or a permanent magnet and sensing
sintered products using magnetic saturation induction test
coils of the test apparatus. The specimen is magnetized to
instrumentation. induction saturation by the field and translated linearly that the
intrinsic magnetic moment of the specimen’s binder phase
1.2 The values stated in SI units are to be regarded as
induces a dc current to flow in the sensing coils of the test
standard. No other units of measurement are included in this
apparatus.The induced current is proportional to the amount of
standard.
magnetic binder phase present in the test specimen. Measure-
1.3 This standard does not purport to address all of the
ment of the induced current permits calculation of the intrinsic
safety concerns, if any, associated with its use. It is the
magnetic saturation of the test sample.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 This test method allows the nondestructive measure-
ment of the magnetic fraction of the binder phase in cemented
2. Referenced Documents
carbide powder materials and sintered product, and may be
2
2.1 ASTM Standards:
used as an indirect measure of the carbon level in the material
A340 Terminology of Symbols and Definitions Relating to
or product.
Magnetic Testing
5.2 Measurement of magnetic saturation provides a com-
B243 Terminology of Powder Metallurgy
parison of the relative fraction of magnetic binder phase that is,
E177 Practice for Use of the Terms Precision and Bias in
cobalt, nickel, or iron, present in the material and can be used
ASTM Test Methods
for acceptance of product to specification.
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
5.3 Measurement of magnetic saturation can be used as a
E1316 Terminology for Nondestructive Examinations
measure of the quality of powder material.
3. Terminology
6. Interferences
3.1 Definitions:
6.1 No direct absolute measurement of magnetic saturation
3.1.1 For definition of terms used in this procedure refer to
can be made. The measurement is a relative comparison of
Terminology A340, Terminology B243, and Terminology
standard reference materials.
E1316.
6.2 Measurement of magnetic saturation is a nondestructive
3.1.2 dc—direct current.
“bulk” measurement which is averaged over the test specimen
volume. The technique cannot be used to infer anything
regarding the relative distribution of the binder phase within
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This test method is under the jurisdiction of ASTM Committee B09 on Metal
the test sample.
Powders and Metal Powder Products and is the direct responsibility of Subcom-
mittee B09.06 on Cemented Carbides.
6.3 Measurement of magnetic saturation is affected by test
Current edition approved May 15, 2012. Published September 2012. Originally
sample size and shape, especially aspect ratio, and the compo-
approved in 1998. Last previous edition approved in 2008 as B886–03(2008). DOI:
sition of the binder phase, that is, a mixture of ferromagnetic
10.1520/B0886-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or elements of varying intrinsic magnetic moments.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.4 Small test samples or test samples containing relatively
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. low concentrations of the binder phase may be immeasurable
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B886 − 12
in that the low concentration prohibits detection by the field 11. Report
sensing coils of the specific apparatus employed. 3
11.1 Report magnetic saturation as Tesla-m per kilogram
(emu per gram), or as relative percent, (that is, magnetic
7. Apparatus
portion of the binder phase/total mass of binder phase in test
sample).
7.1 Instrumentation capable of inducing magnetic saturation
and then sensing t
...