ASTM B648-10

Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor

SIGNIFICANCE AND USE
The Barcol Impressor is portable and therefore useful for in situ determination of the hardness of fabricated parts and individual test specimens for production control purposes.
This test method should be used only as cited in applicable material specifications.
SCOPE
1.1 This test method covers the determination of indentation hardness of aluminum alloys using a Barcol Impressor, Model No. 934-1.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 Exception—The values given in parentheses are for information only.
Note 1—Another model, No. 935, is for use on plastics but is not included in this test method and should not be used for aluminum alloys.
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: 30-Nov-2010
• ICS: 77.120.10 - Aluminium and aluminium alloys
• Technical Committee: B07 - Light Metals and Alloys
• Drafting Committee: B07.05 - Testing

Relations

• Replaces: ASTM B648-78(2006) - Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor
• Effective Date: 01-Dec-2010
• Referred By: ASTM B308/B308M-20 - Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles
• Effective Date: 01-Dec-2010
• Referred By: ASTM B945-21 - Standard Practice for Aluminum Alloy Extrusions Press Cooled from an Elevated Temperature Shaping Process for Production of T1, T2, T5 and T10-Type Tempers
• Effective Date: 01-Dec-2010
• Referred By: ASTM B807/B807M-20 - Standard Practice for Extrusion Press Solution Heat Treatment for Aluminum Alloys
• Effective Date: 01-Dec-2010
• Referred By: ASTM B241/B241M-22 - Standard Specification for Aluminum and Aluminum-Alloy Seamless Pipe and Seamless Extruded Tube
• Effective Date: 01-Dec-2010
• Referred By: ASTM F3122-14(2022) - Standard Guide for Evaluating Mechanical Properties of Metal Materials Made via Additive Manufacturing Processes
• Effective Date: 01-Dec-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B648 − 10
StandardTest Method for
Indentation Hardness of Aluminum Alloys by Means of a
1
Barcol Impressor
This standard is issued under the fixed designation B648; 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. Significance and Use
1.1 Thistestmethodcoversthedeterminationofindentation 4.1 The Barcol Impressor is portable and therefore useful
hardness of aluminum alloys using a Barcol Impressor, Model for in situ determination of the hardness of fabricated parts and
No. 934-1. individual test specimens for production control purposes.
1.2 The values stated in SI units are to be regarded as 4.2 This test method should be used only as cited in
standard. No other units of measurement are included in this applicable material specifications.
standard.
5. Apparatus
1.2.1 Exception—The values given in parentheses are for
information only.
5.1 Barcol Impressor, Model 934-1— See Fig. 1 and Fig. 2.
NOTE 1—Another model, No. 935, is for use on plastics but is not
5.2 Indentor—The indentor shall consist of a hardened steel
included in this test method and should not be used for aluminum alloys.
truncated cone having an angle of 26° with a flat tip 0.157 mm
1.3 This standard does not purport to address all of the
(0.0062 in.) in diameter. It shall fit into a hollow spindle and be
safety concerns, if any, associated with its use. It is the
held down by a spring-loaded plunger. See Fig. 2.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.3 Indicating Device—The indicating dial shall have 100
bility of regulatory limitations prior to use. divisions, each representing a depth of 0.0076 mm (0.00030
in.)penetration.Thehigherthereading,theharderthematerial.
2. Referenced Documents
2 6. Test Parts or Specimen
2.1 ASTM Standards:
E6 Terminology Relating to Methods of Mechanical Testing
6.1 The testing area shall be smooth, clean, and free of
E10 Test Method for Brinell Hardness of Metallic Materials mechanical damage. The surface may be lightly polished to
E18 Test Methods for Rockwell Hardness of Metallic Ma-
eliminate scratches or die lines. It shall be such that it can be
terials essentially perpendicular to the indentor during the test.
E177 Practice for Use of the Terms Precision and Bias in
NOTE 2—The effect of curvature of the test specimen on the Barcol
ASTM Test Methods
Impressor readings is presented in Appendix X1, Fig. X1.1.
E691 Practice for Conducting an Interlaboratory Study to
6.2 Dimensions—Test parts or specimens shall be at least
Determine the Precision of a Test Method
1
1.5 mm ( ⁄16 in.) thick and large enough to ensure a minimum
1
distance of 3 mm ( ⁄8 in.) in any direction from the indentor
3. Terminology
point to the edge.
3.1 Definitions—The definitions of terms relating to hard-
ness testing appearing in Terminology E6 shall be considered
7. Calibration
as applying to the terms used in this test method.
7.1 With the plunger upper guide backed out until it just
engages the spring, place the impressor on a glass surface and
press down until the penetrator point is forced all the way back
1
This test method is under the jurisdiction of ASTM Committee B07 on Light
into the lower plunger guide. The indicator should then read
Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on
Testing.
100 6 1. If it does not, loosen the locknut and turn the lower
Current edition approved Dec. 1, 2010. Published January 2011. Originally
plunger guide in or out to obtain a reading of 100.
approved in 1978. Last previous edition approved in 2006 as B648 – 78 (2006).
DOI: 10.1520/B0648-10.
7.2 Read the hardness of a “hard” aluminum alloy reference
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
disk supplied by the manufacturer of the impressor and, if
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
necessary, adjust so that the reading is within the range marked
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. on the disk.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B648 − 10
TABLE 1 Recommended Sample Sizes to Equalize the
Variance of the Average
Hardness, Coefficient Minimum
Reading Variance of
M-934-1 of Variation, No. of
Variance Average
Scale % Readings
50 1.66 1.1 0.28 6
60 1.39 0.9 0.28 5
70 1.12 0.8 0.28 4
80 0.85 0.7 0.28 3
10. Precision and Bias
10.1 The prec
...

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:B648–78 (Reapproved 2006) Designation:B648–10
Standard Test Method for
Indentation Hardness of Aluminum Alloys by Means of a
1
Barcol Impressor
This standard is issued under the fixed designation B648; 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 This test method covers the determination of indentation hardness of aluminum alloys using a Barcol Impressor, Model No.
934-1.
1.2The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 Exception—The values given in parentheses are for information only.
NOTE 1—Another model, No. 935, is for use on plastics but is not included in this test method and should not be used for aluminum alloys.
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
2.1 ASTM Standards:
E6 Terminology Relating to Methods of Mechanical Testing E10
E10 Test Method for Brinell Hardness of Metallic Materials
E18 Test Methods for Rockwell Hardness of Metallic Materials
E18Test Methods for Rockwell Hardness of Metallic Materials 177 Practice for Use of the Terms Precision and Bias inASTM
Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions—The definitions of terms relating to hardness testing appearing in Terminology E6 shall be considered as
applying to the terms used in this test method.
4. Significance and Use
4.1 The Barcol Impressor is portable and therefore useful for in situ determination of the hardness of fabricated parts and
individual test specimens for production control purposes.
4.2 This test method should be used only as cited in applicable material specifications.
5. Apparatus
5.1 Barcol Impressor, Model 934-1— See Fig. 1 and Fig. 2.
5.2 Indentor—The indentor shall consist of a hardened steel truncated cone having an angle of 26° with a flat tip 0.157 mm
(0.0062 in.) in diameter. It shall fit into a hollow spindle and be held down by a spring-loaded plunger. See Fig. 2.
5.3 Indicating Device—The indicating dial shall have 100 divisions, each representing a depth of 0.0076 mm (0.00030 in.)
penetration. The higher the reading, the harder the material.
6. Test Parts or Specimen
6.1 The testing area shall be smooth, clean, and free of mechanical damage. The surface may be lightly polished to eliminate
scratches or die lines. It shall be such that it can be essentially perpendicular to the indentor during the test.
1
This test method is under the jurisdiction of ASTM Committee B07 on Light Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on Testing.
Current edition approved Sept.Dec. 1, 2006.2010. Published September 2006.January 2011. Originally approved in 1978. Last previous edition approved in 20002006 as
B648 – 78 (2000).(2006). DOI: 10.1520/B0648-78R06. 10.1520/B0648-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
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.
1

---------------------- Page: 1 ----------------------
B648–10
FIG. 1 Barcol Impressor, Model 934-1
FIG. 2 Diagram of Barcol Impressor
NOTE 2—The effect of curvature of the test specimen on the Barcol Impressor readings is presented in Appendix X1, Fig. X1.1.
1
6.2 Dimensions—Testpartsorspecimensshallbeatleast1.5mm( ⁄16in.)thickandlargeenoughtoensureaminimumdistance
1
of3mm( ⁄8 in.) in any direction from the indentor point to the edge.
7. Calibration
7.1 With the plunger upper guide backed out until it just engages the spring, place the impressor on a glass surface and press
down until the penetrator point is forced all the way back into the lower plunger guide. The indicator should then
...