ASTM B925-08
(Practice)Standard Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens
Standard Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens
SIGNIFICANCE AND USE
Test specimens are used to determine the engineering properties of PM materials, for example, tensile strength, ductility, impact energy, etc.; property data that are essential to the successful use of PM material standards. Processing PM test specimens under production conditions is the most efficient method by which to obtain reliable PM material property data since in most cases it is impractical or impossible to cut test bars from sintered parts.
The performance characteristics of metal powders, for example, compressibility, green strength and dimensional changes associated with processing are evaluated using PM test specimens under controlled conditions. The data obtained are important to both metal powder producers and PM parts manufacturers.
PM test specimens play a significant role in industrial quality assurance programs. They are used to compare properties of a new lot of metal powder with an established lot in an acceptance test and are used in the part manufacturing process to establish and adjust production variables.
In those instances where it is required to present equivalent property data for a production lot of PM parts, standard test specimens compacted from the production powder mix to the same green density can be processed with the production PM parts and then tested to obtain this information.
Material property testing performed for industrial or academic research and development projects uses standard PM test specimens so the test results obtained can be compared with previous work or published data.
Powder metallurgy test specimens may have multiple uses. The dimensions and tolerances given in this standard are nominal in many cases. The user is cautioned to make certain that the dimensions of the test specimen are in agreement with the requirements of the specific test method to be used.
SCOPE
1.1 These standard practices cover the specifications for those uniaxially compacted test specimens that are used in ASTM standards, the procedures for producing and preparing these test specimens, and reference the applicable standards.
1.2 Basic tool design and engineering information regarding the tooling that is required to compact the test specimens and machining blanks are contained in the annexes.
1.3 This standard is intended to be a comprehensive one-source document that can be referenced by ASTM test methods that utilize PM test specimens and in ASTM PM material specifications that contain the engineering data obtained from these test specimens.
1.4 These practices are not applicable to metal powder test specimens that are produced by other processes such as cold isostatic pressing (CIP), hot isostatic pressing (HIP), powder forging (PF) or metal injection molding (MIM). They do not pertain to cemented carbide materials.
1.5 Detailed information on PM presses, compacting tooling and sintering furnaces, their design, manufacture and use are not within the scope of these practices.
1.6 Test specimen and die cavity dimensions shown in inch-pound units are to be regarded as standard and are applicable to the referenced ASTM test methods and material specifications. Values in SI units are shown in parentheses and result from conversion in accordance with IEEE/ASTM Standard SI 10. They may be approximate and are only for information.
1.7 This standard may involve hazardous materials, operations, and equipment. 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: B925 − 08
StandardPractices for
Production and Preparation of Powder Metallurgy (PM) Test
1
Specimens
This standard is issued under the fixed designation B925; 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* 2. Referenced Documents
2
1.1 These standard practices cover the specifications for
2.1 ASTM Standards:
those uniaxially compacted test specimens that are used in
A34/A34M Practice for Sampling and Procurement Testing
ASTM standards, the procedures for producing and preparing
of Magnetic Materials
these test specimens, and reference the applicable standards.
A341/A341M Test Method for Direct Current Magnetic
Properties of Materials Using D-C Permeameters and the
1.2 Basictooldesignandengineeringinformationregarding
Ballistic Test Methods
the tooling that is required to compact the test specimens and
A596/A596M Test Method for Direct-Current Magnetic
machining blanks are contained in the annexes.
Properties of Materials Using the Ballistic Method and
1.3 This standard is intended to be a comprehensive one-
Ring Specimens
sourcedocumentthatcanbereferencedbyASTMtestmethods
A773/A773M Test Method for dc Magnetic Properties of
that utilize PM test specimens and in ASTM PM material
Materials Using Ring and Permeameter Procedures with
specifications that contain the engineering data obtained from
dc Electronic Hysteresigraphs
these test specimens.
A811 Specification for Soft Magnetic Iron Parts Fabricated
1.4 These practices are not applicable to metal powder test
by Powder Metallurgy (P/M) Techniques
specimens that are produced by other processes such as cold
A839 Specification for Iron-Phosphorus Powder Metallurgy
isostatic pressing (CIP), hot isostatic pressing (HIP), powder
(P/M) Parts for Soft Magnetic Applications
forging (PF) or metal injection molding (MIM). They do not
A904 Specification for 50 Nickel-50 Iron Powder Metal-
pertain to cemented carbide materials.
lurgy Soft Magnetic Parts
A927/A927M Test Method for Alternating-Current Mag-
1.5 Detailed information on PM presses, compacting tool-
netic Properties of Toroidal Core Specimens Using the
ing and sintering furnaces, their design, manufacture and use
Voltmeter-Ammeter-Wattmeter Method
are not within the scope of these practices.
B215 Practices for Sampling Metal Powders
1.6 Test specimen and die cavity dimensions shown in
B243 Terminology of Powder Metallurgy
inch-pound units are to be regarded as standard and are
B312 Test Method for Green Strength of Specimens Com-
applicable to the referenced ASTM test methods and material
pacted from Metal Powders
specifications. Values in SI units are shown in parentheses and
B328 Test Method for Density, Oil Content, and Intercon-
result from conversion in accordance with IEEE/ASTM Stan-
nected Porosity of Sintered Metal Structural Parts and
dard SI 10. They may be approximate and are only for
3
Oil-Impregnated Bearings (Withdrawn 2009)
information.
B331 Test Method for Compressibility of Metal Powders in
1.7 This standard may involve hazardous materials,
Uniaxial Compaction
operations, and equipment. This standard does not purport to
B438 Specification for Bronze-Base Powder Metallurgy
address all of the safety concerns, if any, associated with its
(PM) Bearings (Oil-Impregnated)
use. It is the responsibility of the user of this standard to
B439 Specification for Iron-Base Powder Metallurgy (PM)
establish appropriate safety and health practices and deter-
Bearings (Oil-Impregnated)
mine the applicability of regulatory limitations prior to use.
1 2
This practice is under the jurisdiction of ASTM Committee B09 on Metal For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Powders and Metal Powder Products and is the direct responsibility of Subcom- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mittee B09.02 on Base Metal Powders. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved July 15, 2008. Published August 2008. Originally the ASTM website.
3
approved in 2003. Last previous edition approved in 2003 as B925 – 03. DOI: The last approved version of this historical standard is referenced on
10.1520/B0925-08. www.astm.org.
*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
1
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B925 − 08
B528 Test Method for Transverse Rupture Strength of Pow- since in most cases it is impractical or impossible to cut
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:B925–03 Designation:B925–08
Standard Practices for
Production and Preparation of Powder Metallurgy (P/M)(PM)
1
Test Specimens
This standard is issued under the fixed designation B 925; 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*
1.1 These standard practices cover the specifications for those uniaxially compacted test specimens that are used in ASTM
standards, the procedures for producing and preparing these test specimens, and reference the applicable standards.
1.2 Basic tool design and engineering information regarding the tooling that is required to compact the test specimens and
machining blanks are contained in the annexes.
1.3 This standard is intended to be a comprehensive one-source document that can be referenced by ASTM test methods that
utilize P/MPM test specimens and inASTM P/MPM material specifications that contain the engineering data obtained from these
test specimens.
1.4 Thesepracticesarenotapplicabletometalpowdertestspecimensthatareproducedbyotherprocessessuchascoldisostatic
pressing (CIP), hot isostatic pressing (HIP), powder forging (P/F)(PF) or metal injection molding (MIM). They do not pertain to
cemented carbide materials.
1.5 Detailed information on P/MPM presses, compacting tooling and sintering furnaces, their design, manufacture and use are
not within the scope of these practices.
1.6 Test specimen and die cavity dimensions shown in inch-pound units are to be regarded as standard and are applicable to
the referenced ASTM test methods and material specifications. Values in SI units are shown in parentheses and result from
conversion in accordance with IEEE/ASTM Standard SI-10SI 10. They may be approximate and are only for information.
1.7 This standard may involve hazardous materials, operations, and equipment. 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
2.1 ASTM Standards:
A 34/A 34M Practice for Sampling and Procurement Testing of Magnetic Materials
A 341/A 341M Test Method for Direct- Current Magnetic Properties of Materials Using D-C Permeameters and the Ballistic
Test Methods
A 596/A 596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring
Specimens
A 773/A 773M Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc
Electronic Hysteresigraphs
A 811 Specification for Soft Magnetic Iron Parts Fabricated by Powder Metallurgy (P/M) Techniques
2
A839/A839M Specification for Iron Phosphorus Powder Metallurgy (P/M) Parts for Soft Magnetic Applications 839 Speci-
fication for Iron-Phosphorus Powder Metallurgy (P/M) Parts for Soft Magnetic Applications
2
A 904 Specification for 50 Nickel-50 Iron Powder Metallurgy (P/M) Soft Magnetic Alloys Parts
A 927/A 927M Test Method for Alternating-Current Magnetic Properties of TorroidalToroidal Core Specimens Using the
Voltmeter-Ammeter-Wattmeter Method
B 215Practices for Sampling Finished Lots of Metal Powder Practices for Sampling Metal Powders
B 243 Terminology of Powder Metallurgy
B 312 Test Method for Green Strength for Compacted Metal Powder Specimens
1
This practice is under the jurisdiction ofASTM Committee B09 on Metal Powders and Metal Powder Products and is the direct responsibility of Subcommittee B09.02
on Base Metal Powders.
Current edition approved April 10, 2003. Published June 2003.
Current edition approved July 15, 2008. Published August 2008. Originally approved in 2003. Last previous edition approved in 2003 as B 925–03.
2
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.
*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.
1
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B925–08
B 328 Test Method for Density, Oil Content, and Interconnecte
...
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