ASTM B886-03(2008)
(Test Method)Standard Test Method for Determination of Magnetic Saturation (Ms) of Cemented Carbides
Standard Test Method for Determination of Magnetic Saturation (Ms) of Cemented Carbides
SIGNIFICANCE AND USE
This test method allows the nondestructive 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 standard. No other units of measurement are included in this 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.
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Designation: B886 − 03(Reapproved 2008)
Standard Test Method for
Determination of Magnetic Saturation (Ms) of Cemented
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 induction saturation by the field and translated linearly that the
intrinsic magnetic moment of the specimen’s binder phase
1.1 This test method covers the determination of magnetic
induces a dc current to flow in the sensing coils of the test
saturation (Ms) of cemented carbide powder materials and
apparatus.The induced current is proportional to the amount of
sintered products using magnetic saturation induction test
magnetic binder phase present in the test specimen. Measure-
instrumentation.
ment of the induced current permits calculation of the intrinsic
1.2 The values stated in SI units are to be regarded as
magnetic saturation of the test sample.
standard. No other units of measurement are included in this
standard.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 This test method allows the nondestructive measure-
safety concerns, if any, associated with its use. It is the
ment of the magnetic fraction of the binder phase in cemented
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- carbide powder materials and sintered product, and may be
bility of regulatory limitations prior to use. used as an indirect measure of the carbon level in the material
or product.
2. Referenced Documents
5.2 Measurement of magnetic saturation provides a com-
2.1 ASTM Standards:
parison of the relative fraction of magnetic binder phase that is,
A340 Terminology of Symbols and Definitions Relating to
cobalt, nickel, or iron, present in the material and can be used
Magnetic Testing
for acceptance of product to specification.
B243 Terminology of Powder Metallurgy
E1316 Terminology for Nondestructive Examinations
5.3 Measurement of magnetic saturation can be used as a
measure of the quality of powder material.
3. Terminology
3.1 Definitions:
6. Interferences
3.1.1 For definition of terms used in this procedure refer to
6.1 No direct absolute measurement of magnetic saturation
Terminology A340, Terminology B243, and Terminology
can be made. The measurement is a relative comparison of
E1316.
standard reference materials.
3.1.2 dc—direct current.
6.2 Measurement of magnetic saturation is a nondestructive
4. Summary of Test Method
“bulk” measurement which is averaged over the test specimen
4.1 A test specimen is statically positioned in the magnetic
volume. The technique cannot be used to infer anything
field generated by dc coils or a permanent magnet and sensing
regarding the relative distribution of the binder phase within
coils of the test apparatus. The specimen is magnetized to
the test sample.
6.3 Measurement of magnetic saturation is affected by test
This test method is under the jurisdiction of ASTM Committee B09 on Metal
sample size and shape, especially aspect ratio, and the compo-
Powders and Metal Powder Products and is the direct responsibility of Subcom-
sition of the binder phase, that is, a mixture of ferromagnetic
mittee B09.06 on Cemented Carbides.
Current edition approved April 1, 2008. Published April 2008. Originally
elements of varying intrinsic magnetic moments.
approved in 1998. Last previous edition approved in 2003 as B886–03. DOI:
10.1520/B0886-03R08.
6.4 Small test samples or test samples containing relatively
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
low concentrations of the binder phase may be immeasurable
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in that the low concentration prohibits detection by the field
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sensing coils of the specific apparatus employed.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B886 − 03 (2008)
7. Apparatus 10.7 Relative percent of magnetic saturation of the test
sample may be calculated and
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:B886–98 Designation:B886–03 (Reapproved 2008)
Standard Test Method for
Determination of Magnetic Saturation (Ms) of Cemented
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
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.
1.2The values stated in SI units are to be regarded as the standard.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.
2. Referenced Documents
2.1 ASTM Standards:
A 340 Terminology of Symbols and Definitions Relating to Magnetic Testing
B 243 Terminology of Powder Metallurgy
E 1316 Terminology for Nondestructive Examinations
3. Terminology
3.1 Definitions:
3.1.1 For definition of terms used in this procedure refer to TerminologyA 340, Terminology B 243, and Terminology E 1316.
3.1.2 dc—direct current.
4. Summary of Test Method
4.1 A weighed test specimen is statically positioned in the magnetic field generated by dc magnetic field/sensing coils or a
permanent magnet and sensing coils of the test apparatus. The specimen is magnetized to induction saturation by the field coils
and translated linearly in such a manner that the intrinsic magnetic moment of the magnetic portion of the specimen’s binder phase
induces a d-cdc current to flow in the sensing coils of the test apparatus. The induced current is proportional to the amount of
magnetic binder phase present in the test specimen. Measurement of the induced current permits calculation of the intrinsic
magnetic saturation of the test sample.
5. Significance and Use
5.1 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.
5.2 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.
5.3 Measurement of magnetic saturation can be used as a measure of the quality of powder material.
ThistestmethodisunderthejurisdictionofASTMCommitteeB-9onMetalPowdersandMetalPowderProductsandisthedirectresponsibilityofSubcommitteeB09.06
on Cemented Carbides.
Current edition approved May 10, 1998. Published November 1998.
This test method is under the jurisdiction of ASTM Committee B09 on Metal Powders and Metal Powder Products and is the direct responsibility of Subcommittee
B09.06 on Cemented Carbides.
Current edition approved April 1, 2008. Published April 2008. Originally approved in 1998. Last previous edition approved in 2003 as B 886–03.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 03.04.volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B886–03 (2008)
6. Interferences
6.1 No direct absolute measurement of magnetic saturation can be made. The measurement is a relative comparison of standard
reference materials.
6.2 Measurement of magnetic saturation is a non-destructive “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 the test
sample.
6.3 Measurement of magnetic saturation is affected by test sample size and shape, especially aspect ratio, and the composition
of the binder phase, that is, a mixture of ferromagnetic elements of varying intrinsic magnetic moments.
6.4 Small test samples or test samples contain
...
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