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ASTM B887-03

(Test Method)

Standard Test Method for Determination of Coercivity (Hcs) of Cemented Carbides

Standard Test Method for Determination of Coercivity (Hcs) of Cemented Carbides

SIGNIFICANCE AND USE
Measurement of coercivity provides a relative comparison of carbide grain size, binder content, and possibly carbon deficiency for a given graded carbide material or product, and may be employed as a non-destructive measurement indicating deviation from a specified norm.
This test method allows the non-destructive estimate of average carbide grain size in sintered cemented carbide hardmetals. It is appropriate for a wide range of compositions and tungsten carbide (WC) WC grain sizes, and can be used for acceptance of material or product to specification.
SCOPE
1.1 This test method covers the determination of magnetization coercivity (Hcs) of cemented carbide materials and products using coercive force instrumentation. It is patterned after ISO 3326.
1.2 The values in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with 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
77.160 - Powder metallurgy
Technical Committee
B09 - Metal Powders and Metal Powder Products
Drafting Committee
B09.06 - Cemented Carbides
Current Stage
Ref Project

Relations

Replaces
ASTM B887-98 - Standard Test Method for Determination of Coercivity (Hcs) of Cemented Carbides
Effective Date
10-Apr-2003
Replaced By
ASTM B887-03(2008)e1 - Standard Test Method for Determination of Coercivity (Hcs) of Cemented Carbides
Effective Date
01-Apr-2008

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ASTM B887-03 - Standard Test Method for Determination of Coercivity (Hcs) of Cemented CarbidesASTM B887-03 - Standard Test Method for Determination of Coercivity (Hcs) of Cemented Carbides
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ASTM B887-03 - Standard Test Method for Determination of Coercivity (Hcs) of Cemented Carbides
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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:B887–03
Standard Test Method for
1
Determination of Coercivity (Hcs) of Cemented Carbides
This standard is issued under the fixed designation B 887; 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 4. Summary of Test Method
1.1 This test method covers the determination of magneti- 4.1 A test sample is positioned in the dc magnetic field of
zation coercivity (Hcs) of cemented carbide materials and the test apparatus and magnetized to technical saturation. The
products using coercive force instrumentation. It is patterned magnetic field polarity is then reversed and the test sample is
after ISO 3326. demagnetized by increasing the energy of the reversed mag-
1.2 The values in either SI units or inch-pound units are to netic field until the test sample reaches zero magnetism. The
be regarded separately as standard. The values stated in each coercive force (Hc) is the magnetizing force required to return
system may not be exact equivalents; therefore, each system the saturated magnetic induction to zero.
shall be used independently of the other. Combining values
5. Significance and Use
from the two systems may result in non-conformance with the
5.1 Measurement of coercivity provides a relative compari-
standard.
1.3 This standard does not purport to address all of the son of carbide grain size, binder content, and possibly carbon
deficiency for a given graded carbide material or product, and
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- may be employed as a non-destructive measurement indicating
deviation from a specified norm.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.2 This test method allows the non-destructive estimate of
average carbide grain size in sintered cemented carbide hard-
2. Referenced Documents
metals. It is appropriate for a wide range of compositions and
2.1 ASTM Standards: tungsten carbide (WC) WC grain sizes, and can be used for
A 340 Terminology of Symbols and Definitions Relating to acceptance of material or product to specification.
2
Magnetic Testing
3 6. Interferences
B 243 Terminology of Powder Metallurgy
6.1 Hcs measurement is a non-destructive “bulk” measure-
2.2 ISO Standard:
ISO 3326 Hardmetals - Determination of (the Magnetiza- ment that is averaged over the specimen volume. Bi-modal
4
grain size distributions will give approximately the same Hc
tion) Coercivity
value as would be obtained from a normal grain size distribu-
3. Terminology
tion about the same mean value.
3.1 Definitions: 6.2 Large test specimens must be sized to fit within the
3.1.1 For definition of terms used in this procedure refer to magnetic field coil spacing available for the apparatus em-
Terminology A 340 and Terminology B 243. ployed.
3.1.2 dc—direct current 6.3 Small test specimens may be immeasurable if their size
prohibits detection by the magnetic field coils for the apparatus
employed.
1
This test method is under the jurisdiction of ASTM Committee B09 on Metal
6.4 Specimen shape, that is, symmetry and aspect ratio,
Powders and Metal Powder Products and is the direct responsibility of Subcom-
influence Hc measurement values and repeatability of results.
mittee B09.06 on Cemented Carbides.
Current edition approved April 10, 2003. Published April 2003. Originally Test specimens should be positioned with their long axis in the
approved in 1998. Last previous edition approved in 1998 as B 887–98.
direction of the magnetic field. Asymmetrically shaped test
2
Annual Book of ASTM Standards, Vol 03.04.
specimens should be tested in several positions, the measure-
3
Annual Book of ASTM Standards, Vol 02.05.
4
ment values recorded, and the average value reported.
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B887–03
7. Apparatus 9. Report
9.1 Report the following information:
7.1 Instrumentation capable of the dc magnetization of
9.1.1 Test sample identification,
appropriately sized test samples to technical saturation and
9.1.2 Average Hcs coercivity (amp per meter (A/m) or
accurate measurement of the energy required to restore the
oersteds), and
magnetic induction to zero.
9.1.3 Range of measured Hc values, especially for replicate
measurements of asymmetric sample shapes.
8. Procedure
10. Precision and Bias
8.1 For co
...

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