ASTM B925-15(2022)

Standard Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens

SIGNIFICANCE AND USE
5.1 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.  
5.2 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.  
5.3 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.  
5.4 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.  
5.5 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.  
5.6 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 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 28-Feb-2022
• ICS: 77.160 - Powder metallurgy
• Technical Committee: B09 - Metal Powders and Metal Powder Products
• Drafting Committee: B09.02 - Base Metal Powders

Relations

• Refers: ASTM E23-24 - Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
• Effective Date: 01-Apr-2024
• Refers: ASTM B963-24 - Standard Test Methods for Oil Content, Oil-Impregnation Efficiency, and Surface-Connected Porosity of Sintered Powder Metallurgy (PM) Products Using Archimedes’ Principle
• Effective Date: 01-Feb-2024
• Refers: ASTM B312-20 - Standard Test Method for Green Strength of Specimens Compacted from Metal Powders
• Effective Date: 01-Apr-2020
• Refers: ASTM B823-20 - Standard Specification for Materials for Copper Base Powder Metallurgy (PM) Structural Parts
• Effective Date: 01-Apr-2020
• Refers: ASTM B783-19 - Standard Specification for Materials for Ferrous Powder Metallurgy (PM) Structural Parts
• Effective Date: 01-Oct-2019
• Refers: ASTM B243-18 - Standard Terminology of Powder Metallurgy
• Effective Date: 01-Oct-2018
• Refers: ASTM E18-18 - Standard Test Methods for Rockwell Hardness of Metallic Materials
• Effective Date: 01-Jul-2018
• Refers: ASTM E18-17 - Standard Test Methods for Rockwell Hardness of Metallic Materials
• Effective Date: 01-Jul-2017
• Refers: ASTM E228-11(2016) - Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
• Effective Date: 01-Sep-2016
• Refers: ASTM B243-16 - Standard Terminology of Powder Metallurgy
• Effective Date: 01-Jul-2016
• Refers: ASTM E23-16a - Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
• Effective Date: 01-Apr-2016
• Refers: ASTM E23-16 - Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
• Effective Date: 01-Jan-2016
• Refers: ASTM B823-15 - Standard Specification for Materials for Copper Base Powder Metallurgy (PM) Structural Parts
• Effective Date: 01-Oct-2015
• Refers: ASTM B962-15 - Standard Test Methods for Density of Compacted or Sintered Powder Metallurgy (PM) Products Using Archimedes’ Principle
• Effective Date: 01-Apr-2015
• Refers: ASTM B963-14 - Standard Test Methods for Oil Content, Oil-Impregnation Efficiency, and Surface-Connected Porosity of Sintered Powder Metallurgy (PM) Products Using Archimedes’ Principle
• Effective Date: 01-Sep-2014

Overview

ASTM B925-15(2022): Standard Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens provides comprehensive guidelines for producing and preparing test specimens used to determine critical engineering properties of PM materials such as tensile strength, ductility, impact energy, and more. Developed by ASTM International, this standard supports industry needs for reliable and reproducible PM material property data, enabling accurate comparison, quality assurance, and product development in powder metallurgy applications.

Powder metallurgy test specimens produced under controlled, production-like conditions deliver essential data for both powder manufacturers and PM parts producers. The practices outlined help ensure that standardized test specimen preparation is consistent, supporting material specification, sampling, and testing across a variety of PM material standards and research initiatives.

Key Topics

• Specimen Types: Covers the specifications and preparation of uniaxially compacted PM test specimens used in ASTM standards, such as tensile, compression, impact, fatigue, and magnetic test specimens.
• Specimen Preparation: Details procedures for uniaxial compaction, sintering, machining, and finishing of test specimens, ensuring consistent testing conditions.
• Quality Assurance: Emphasizes the role of PM test specimens in industrial quality assurance programs, batch acceptance, and process control.
• Data Comparability: Supports consistency in test results by advocating the use of standard specimen geometry and processing, enabling data comparison across research, production, and published materials.
• Limitations: Specifies that these practices are not applicable to test specimens produced by alternative processes such as cold isostatic pressing (CIP), hot isostatic pressing (HIP), powder forging, or metal injection molding (MIM), and excludes cemented carbides.

Applications

ASTM B925-15(2022) is widely used throughout the powder metallurgy industry to ensure valid and meaningful property data:

• Material Development & Research: Laboratories and academic institutions use standard PM test specimens to compare new materials and processing methods against established results.
• Quality Control & Batch Comparison: PM producers and parts manufacturers perform acceptance testing by comparing test specimens from new lots with reference materials to monitor consistency and adjust production variables.
• Production Lot Testing: Enables parallel processing of specimens alongside PM parts to demonstrate equivalent properties within a production batch.
• Process Optimization: Standardized specimens facilitate the evaluation and optimization of variables such as compressibility, green strength, dimensional change, and mechanical properties.
• Industry Specification Compliance: Assists in meeting requirements for ASTM PM material standards, ensuring compatibility and repeatability across different facilities and product lines.

Related Standards

ASTM B925-15(2022) references and works in conjunction with numerous other ASTM standards and industry documents, including:

• Test Methods:
  • ASTM E8: Tension Testing of Metallic Materials
  • ASTM E9: Compression Testing of Metallic Materials
  • ASTM E23: Notched Bar Impact Testing of Metallic Materials
  • ASTM B312, B528, B610, B939, B963: PM-specific mechanical and physical tests
• Material Specifications:
  • ASTM B783, B823, B853: PM structural parts specifications
  • ASTM B438, B439: PM bearing specifications
  • ASTM B595, B817, A811, A839, A904: Soft magnetic, iron, titanium, or specialty PM components
• Sampling and Terminology:
  • ASTM B215: Sampling metal powders
  • ASTM B243: Powder metallurgy terminology
• Industry Standards:
  • MPIF Standard 56: Fatigue testing in powder metallurgy materials

By adhering to these standard practices, organizations enhance the reliability of their PM material testing programs, supporting innovation, compliance, and quality in powder metallurgy.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B925 − 15 (Reapproved 2022)
Standard Practices for
Production and Preparation of Powder Metallurgy (PM) Test
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* ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 These standard practices cover the specifications for
mendations issued by the World Trade Organization Technical
those uniaxially compacted test specimens that are used in
Barriers to Trade (TBT) Committee.
ASTM standards, the procedures for producing and preparing
these test specimens, and reference the applicable standards.
2. Referenced Documents
1.2 Basictooldesignandengineeringinformationregarding
2.1 ASTM Standards:
the tooling that is required to compact the test specimens and
A34/A34M Practice for Sampling and Procurement Testing
machining blanks are contained in the annexes.
of Magnetic Materials
1.3 This standard is intended to be a comprehensive one-
A341/A341M Test Method for Direct Current Magnetic
sourcedocumentthatcanbereferencedbyASTMtestmethods
Properties of Soft Magnetic Materials Using D-C Per-
that utilize PM test specimens and in ASTM PM material
meameters and the Point by Point (Ballistic)Test Methods
specifications that contain the engineering data obtained from
A596/A596M Test Method for Direct-Current Magnetic
these test specimens.
PropertiesofMaterialsUsingthePointbyPoint(Ballistic)
1.4 These practices are not applicable to metal powder test Method and Ring Specimens
A773/A773M Test Method for Direct Current Magnetic
specimens that are produced by other processes such as cold
Properties of Low Coercivity Magnetic Materials Using
isostatic pressing (CIP), hot isostatic pressing (HIP), powder
Hysteresigraphs
forging (PF) or metal injection molding (MIM). They do not
A811 Specification for Soft Magnetic Iron Parts Fabricated
pertain to cemented carbide materials.
by Powder Metallurgy Techniques
1.5 Detailed information on PM presses, compacting tool-
A839 Specification for Iron-Phosphorus Powder Metallurgy
ing and sintering furnaces, their design, manufacture and use
Parts for Soft Magnetic Applications
are not within the scope of these practices.
A904 Specification for 50 Nickel-50 Iron Powder Metal-
1.6 The values stated in inch-pound units are to be regarded
lurgy Soft Magnetic Parts
as standard. The values given in parentheses are mathematical
A927/A927M Test Method for Alternating-Current Mag-
conversions to SI units that are provided for information only
netic Properties of Toroidal Core Specimens Using the
and are not considered standard.
Voltmeter-Ammeter-Wattmeter Method
1.7 This standard may involve hazardous materials, B215 Practices for Sampling Metal Powders
operations, and equipment. This standard does not purport to B243 Terminology of Powder Metallurgy
address all of the safety concerns, if any, associated with its B312 Test Method for Green Strength of Specimens Com-
use. It is the responsibility of the user of this standard to pacted from Metal Powders
establish appropriate safety, health, and environmental prac- B331 Test Method for Compressibility of Metal Powders in
tices and determine the applicability of regulatory limitations Uniaxial Compaction
prior to use. B438 Specification for Bronze-Base Powder Metallurgy
1.8 This international standard was developed in accor- (PM) Bearings (Oil-Impregnated)
dance with internationally recognized principles on standard- B439 Specification for Iron-Base Powder Metallurgy (PM)
Bearings (Oil-Impregnated)
These practices are under the jurisdiction of ASTM Committee B09 on Metal
Powders and Metal Powder Products and are the direct responsibility of Subcom-
mittee B09.02 on Base Metal Powders. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2022. Published March 2022. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2003. Last previous edition approved in 2015 as B925 – 15. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0925-15R22. theASTM 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
B925 − 15 (2022)
B528 Test Method for Transverse Rupture Strength of Pow- 5. Significance and Use
der Metallurgy (PM) Specimens
5.1 Test specimens are used to determine the engineering
B595 Specification for Materials for Aluminum Powder
properties of PM materials, for example, tensile strength,
Metallurgy (PM) Structural Parts
ductility, impact energy, etc.; property data that are essential to
B610 Test Method for Measuring Dimensional Changes
the successful use of PM material standards. Processing PM
Associated with Processing Metal Powders Intended for
testspecimensunderproductionconditionsisthemostefficient
Die Compaction
method by which to obtain reliable PM material property data
B783 Specification for Materials for Ferrous Powder Metal-
since in most cases it is impractical or impossible to cut test
lurgy (PM) Structural Parts
bars from sintered parts.
B817 Specification for Powder Metallurgy (PM) Titanium
Alloy Structural Components (Withdrawn 2013) 5.2 The performance characteristics of metal powders, for
example, compressibility, green strength and dimensional
B823 Specification for Materials for Copper Base Powder
Metallurgy (PM) Structural Parts changesassociatedwithprocessingareevaluatedusingPMtest
specimens under controlled conditions. The data obtained are
B853 Specification for Powder Metallurgy (PM) Boron
Stainless Steel Structural Components important to both metal powder producers and PM parts
B939 Test Method for Radial Crushing Strength, K,of manufacturers.
Powder Metallurgy (PM) Bearings and Structural Materi-
5.3 PM test specimens play a significant role in industrial
als
quality assurance programs. They are used to compare prop-
B962 Test Methods for Density of Compacted or Sintered
erties of a new lot of metal powder with an established lot in
Powder Metallurgy (PM) Products Using Archimedes’
an acceptance test and are used in the part manufacturing
Principle
process to establish and adjust production variables.
B963 Test Methods for Oil Content, Oil-Impregnation
Efficiency, and Surface-Connected Porosity of Sintered 5.4 In those instances where it is required to present
Powder Metallurgy (PM) Products Using Archimedes’ equivalent property data for a production lot of PM parts,
standard test specimens compacted from the production pow-
Principle
E8 Test Methods for Tension Testing of Metallic Materials der mix to the same green density can be processed with the
production PM parts and then tested to obtain this information.
[Metric] E0008_E0008M
E9 Test Methods of Compression Testing of Metallic Mate-
5.5 Material property testing performed for industrial or
rials at Room Temperature
academic research and development projects uses standard PM
E18 Test Methods for Rockwell Hardness of Metallic Ma-
test specimens so the test results obtained can be compared
terials
with previous work or published data.
E23 Test Methods for Notched Bar Impact Testing of Me-
5.6 Powder metallurgy test specimens may have multiple
tallic Materials
E228 Test Method for Linear Thermal Expansion of Solid uses. The dimensions and tolerances given in this standard are
Materials With a Push-Rod Dilatometer nominal in many cases. The user is cautioned to make certain
E1876 Test Method for Dynamic Young’s Modulus, Shear that the dimensions of the test specimen are in agreement with
Modulus, and Poisson’s Ratio by Impulse Excitation of the requirements of the specific test method to be used.
Vibration
4 6. Powder Metallurgy Test Specimens
2.2 MPIF Standard:
Standard 56 Method for Determination of Rotating Beam
POWDER COMPRESSIBILITY TESTING
Fatigue Endurance Limit in Powder Metallurgy Materials
6.1 Cylindrical Powder Compressibility Test Specimen:
3. Terminology 6.1.1 Description and Use—This solid cylindrical test
specimen, see Fig. 1, is produced by compacting a test portion
3.1 Definitions—Definitions of powder metallurgy terms
of powder mix in laboratory powder metallurgy tooling similar
can be found in Terminology B243. Additional descriptive
to that shown in Fig. A1.1 in the Annex. An alternative test
information is available in the Related Materials section of Vol
specimen for measuring powder compressibility is the trans-
02.05 of the Annual Book of ASTM Standards.
verse rupture test specimen. These test specimens are not
sintered. The compressibility of the metal powder mix or a
4. Summary of Practice
compressibility curve showing the green density as a function
4.1 Thesepracticesdescribetheproduction,bypressingand
of compacting pressure is determined according to the proce-
sintering metal powders, and the preparation, by machining
dures in Test Method B331.
sinteredblanks,oftestspecimensusedtomeasurepropertiesof
6.1.2 Applicable ASTM Standards:
metal powders and sintered materials.
6.1.2.1 See Test Method B331.
TRANSVERSE RUPTURE, DIMENSIONAL CHANGE
The last approved version of this historical standard is referenced on
AND GREEN STRENGTH TESTING
www.astm.org.
Available from MPIF, 105 College Road East, Princeton, NJ 08540. 6.2 Transverse Rupture Strength Test Specimen:
B925 − 15 (2022)
6.2.1.2 It is an acceptable alternative test specimen to the
cylindrical compact to determine powder compressibility ac-
cording to Test Method B331. The sintered or heat treated
specimen may be used to generate data for the elastic con-
stants. Young’s Modulus is determined by impulse excitation
of vibration and Poisson’s ratio may then be calculated. This
test specimen is also a convenient compact on which to
measure macroindentation hardness after various processing
steps.
6.2.2 Applicable ASTM Standards:
6.2.2.1 See the following Test Methods: B312, B331, B528,
B610, E18, and E1876.
6.2.2.2 See the following PM Material Specifications:
A811, A839, A904, B783, and B823.
RADIAL CRUSHING STRENGTH TESTING
6.3 Radial Crushing Strength Test Specimen:
Dimensions
6.3.1 Description and Use—The radial crushing strength
in. mm
test specimen shown in Fig. 3 is compacted to size in tooling
D—Diameter 1.00 (25.4)
(Fig.A2.3) suitable for the production of a thin-walled hollow
T—Compact thickness 0.280 ± 0.010 (7.11 ± 0.25)
cylinder within the range of the dimensions listed. The testing
FIG. 1 PM Cylindrical Powder Compressibility Test Specimen
procedure involves the application of a compressive force
perpendicular to the central axis of the test cylinder and
calculating the radial crushing strength from the breaking load
6.2.1 Description and Use—The pressed-to-size transverse
and test specimen dimensions. Radial crushing strength is the
rupture test specimen, Fig. 2, is produced by compacting metal
material property that is used to quantify the mechanical
powder in tooling similar to that shown in Fig A1.2.
strength of sintered metal bearings, (oil-impregnated).
6.2.1.1 This rectangular test specimen has multiple uses in
PM. Primarily, it is designed to determine the transverse
rupture strength of sintered or heat treated compacts by
breaking the test specimen as a simple beam in three-point
loading following Test Method B528. But, it is also used to
measure the dimensional changes of metal powder mixes due
to pressing and sintering or other processing steps according to
Test Method B610, and it is used in both a 0.250 and 0.500 in.
(6.35 and 12.70 mm) thick version to determine green strength
using the procedure in Test Method B312.
Dimensions
in. mm
W—Width 0.50 (12.7) Dimensions
L—Length 1.25 (31.8) in. mm
R—Corner radius 0.01 (0.3) D—Outside diameter 0.80 to 2.00 (20 to 51)
T—Thickness (thin) 0.250 ± 0.005 (6.35 ± 0.13) d—Inside diameter 0.50 to 1.00 (13 to 25)
T—Thickness (thick) 0.500 ± 0.005 (12.70 ± 0.13) T—Thickness 0.25 to 1.00 (6 to 25)
NOTE 1—Thickness shall be parallel within 0.005 in. (0.13 mm). NOTE 1—Wall thickness (D-d) shall be less than D/3.
FIG. 2 PM Transverse Rupture Strength Test Specimen FIG. 3 PM Radial Crushing Strength Test Specimen
B925 − 15 (2022)
6.3.1.1 Radial Crushing Strength is determined following shape using tooling similar to that shown in Fig. A2.4 in the
the procedure in Test Method B939. Annex. This test specimen has been designed to have a
2 2
6.3.1.2 Thistestspecimeniswidelyusedinaqualitycontrol convenient 1.00 in. (645.2 mm ) pressing area to simplify
testtodeterminethesinteredmaterialstrengthofmetalpowder compacting calculations.
mixtures that are to be used for the production of any metal 6.4.1.1 It is intended for determining the tensile properties
powder product because it is a quick, easy test and gives and ductility of PM materials that have not been heat treated
reliable and reproducible results. Laboratories testing powder (not quenched and tempered nor sinter-hardened). The testing
mixes intended for the manufacture of porous bearings have proceduresforthisunmachinedPMtestspecimencanbefound
recognized that breaking an unsintered test specimen by in Test Method E8.
diametrical loading will give a green strength value that is 6.4.1.2 The flat tension test specimen is not normally used
relevant in production. with heat treated PM materials because it may produce
6.3.1.3 Laboratories testing powder mixes intended for the unreliable test results and it has a tendency to slip in the grips.
manufacture of porous bearings have recognized that using a Slippagecanbepreventedbytheuseofhydraulicgrips,butthe
hollow cylindrical test specimen for dimensional change mea- squarecornerdesignoftheflatspecimenwillgiverisetostress
surements and determination of green strength will give values concentrations that may result in scattered test values. The
that are relevant in production. machined 190-Round tension test specimen, Fig. 5, is recom-
6.3.1.4 This specimen finds use in determining oil content, mended for use with heat treated PM materials.
impregnation efficiency and interconnected porosity of PM 6.4.2 Applicable ASTM Standards:
bearing materials following the procedures in Test Methods 6.4.2.1 See Test Methods E8.
B963. 6.4.2.2 See the following PM Material Specifications:
6.3.2 Applicable ASTM Standards: A811, A839, A904, B783, B823, and B853.
6.3.2.1 See Test Method B939.
6.5 Machined 190-Round Tension Test Specimen:
6.3.2.2 See the following PM Bearing Specifications: B438
6.5.1 Description and Use—The 190-Round tension test
and B439.
specimen may be prepared by machining a sintered Izod test
specimen blank, to the shape and dimensions shown in Fig. 5.
TENSION TESTING
Thegagesectionshallbefreeofnicks,scratches,toolmarksor
6.4 Flat Unmachined Tension Test Specimen:
other conditions that can deleteriously affect the properties to
6.4.1 Description and Use—The unmachined flat tension
be measured. It is primarily used to measure the tensile
test specimen shown in Fig. 4 is commonly referred to in the
propertiesandductilityofheattreated(quenchedandtempered
industry as “the dogbone.” It is compacted directly to size and
Dimensions
in. mm
G—Gage length 1.000 ± 0.003 (25.40 ± 0.08)
D—Diameter at center of gage sec- 0.187 ± 0.001 (4.75 ± 0.03)
tion
H—Diameter at ends of gage sec- 0.191 ± 0.001 (4.85 ± 0.03)
tion
R—Radius of gage fillet 0.25 (6.4)
Dimensions
A—Length of reduced section 1.875 ± 0.003 (47.63 ± 0.08)
J—Radius of shoulder fillet 0.05 (1.3)
in. mm
L—Compact length 3 nominal (75 nominal)
G—Gage length 1.000 ± 0.003 (25.40 ± 0.08)
B—Length of end section 0.310 ± 0.005 (7.87 ± 0.13)
L—Overall length 3.53 (89.7)
W—Compact thickness 0.394 ± 0.005 (10.00 ± 0.13)
C—Width of grip section 0.34 (8.6)
C—Compact width 0.39 (10.0)
E—End radius C/2 C/2
E—Length of shoulder 0.250 ± 0.005 (6.35 ± 0.13)
W—Width of reduced section 0.235 (5.97)
F—Diameter of shoulder 0.310 ± 0.001 (7.87 ± 0.03)
D—Width at center 0.225 (5.72)
A—Length of reduced section 1.25 (31.8)
NOTE 1—Specimen diameters, 0.191 and 0.187 in. (4.85 and 4.75 mm),
R—Radius of fillet 1.00 (25.4)
T—Thickness 0.140 to 0.250 (3.56 to 6.35) to be concentric within 0.001 in. (0.03 mm) T.I.R.
NOTE 2—Test section shall be free of nicks, scratches, and toolmarks.
NOTE 1— Thickness shall be parallel within 0.005 in. (0.13 mm). Polish longitudinally with 00 emery paper and finish with crocus cloth.
FIG. 4 PM Flat Unmachined Tension Test Specimen FIG. 5 Machined 190-Round PM Tension Test Specimen
B925 − 15 (2022)
or sinter-hardened) PM materials because it gives more con-
sistent test data than those obtained with the flat unmachined
tension test specimen, Fig. 4. These tension properties are
determined following the testing procedures detailed in Test
Method E8.
6.5.2 Applicable ASTM Standards:
6.5.2.1 See Test Methods E8.
6.5.2.2 See the following PM Material Specifications:
B595, B783, and B817.
COMPRESSIVE STRENGTH TESTING
6.6 Machined Compression Test Specimen:
Dimensions
in. mm
L—Overall length 2.95 (75.0)
W—Width 0.394 ± 0.005 (10.00 ± 0.13)
T—Thickness 0.394 ± 0.005 (10.00 ± 0.13)
NOTE 1—Adjacent sides shall be 90° 6 10 min.
FIG. 7 PM Izod (Cantilever-Beam) Impact Test Specimen
Dimensions
compacting direction. (If for other reasons, the Izod test
in. mm
specimen is to be tested in a notched condition, then refer to
L—Length 1.005 ± 0.003 (25.53 ± 0.08)
D—Diameter 0.375 ± 0.003 (9.53 ± 0.08) Test Method E23 for specifications of notch types and testing
procedures for notched bars.)
FIG. 6 Machined PM Compressive Yield Strength Test Specimen
6.7.1.2 This sintered test specimen may also be used as a
blank from which the 190-Round tension test specimen, the
6.6.1 Description and Use—This test specimen, shown in compression test cylinder, the fatigue test specimen, or the
thermal expansion test piece, can be prepared by machining. It
Fig. 6, is usually prepared by machining a sintered Izod test
specimen blank. Test specimens that are to be tested in the can also be shortened to prepare the Charpy test bar.
6.7.2 Applicable ASTM Standards:
compacting direction may be prepared from large sintered
blanks by sectioning vertically into smaller pieces that are then 6.7.2.1 See Test Methods E23.
machined to the required dimensions. This compression test
6.8 Charpy Impact Test Specimen:
cylinderisnotpressedtosizebecauseofitsexcessivelengthto
6.8.1 Description and Use—This PM test specimen, shown
diameter ratio.
in Fig. 8, is produced by compacting and sintering to the shape
6.6.1.1 The compressive strength of PM materials is mea-
sured by use of an extensometer clamped to the gage length
during the test following the procedures in Test Method E9.
The stress at 0.1 % or 0.2 % permanent offset is usually
reported. When reporting the results, it is important that the
relationship between the original compacting direction and the
testing direction be clearly noted.
6.6.2 Applicable ASTM Standards:
6.6.2.1 See Test Method E9.
6.6.2.2 See the following PM Material Specifications: B783
and B823.
IMPACT ENERGY TESTING
6.7 Izod Impact Test Specime
...