ASTM B648-78(2006)

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 the standard. 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.
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: 31-Aug-2006
• 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(2000) - Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor
• Effective Date: 01-Sep-2006
• Replaced By: ASTM B648-10 - Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor
• 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-Sep-2006
• Referred By: ASTM B308/B308M-20 - Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles
• Effective Date: 01-Sep-2006
• 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-Sep-2006
• Referred By: ASTM F3122-14(2022) - Standard Guide for Evaluating Mechanical Properties of Metal Materials Made via Additive Manufacturing Processes
• Effective Date: 01-Sep-2006
• Referred By: ASTM B807/B807M-20 - Standard Practice for Extrusion Press Solution Heat Treatment for Aluminum Alloys
• Effective Date: 01-Sep-2006

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:B648–78 (Reapproved 2006)
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 Thistestmethodcoversthedeterminationofindentation
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 the
standard. 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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents FIG. 1 Barcol Impressor, Model 934-1
2
2.1 ASTM Standards:
E6 TerminologyRelatingtoMethodsofMechanicalTesting 5. Apparatus
E10 Test Method for Brinell Hardness of Metallic Materials
5.1 Barcol Impressor, Model 934-1— See Fig. 1 and Fig. 2.
E18 Test Methods for Rockwell Hardness of Metallic Ma-
5.2 Indentor—The indentor shall consist of a hardened steel
terials
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
3. Terminology
held down by a spring-loaded plunger. See Fig. 2.
3.1 Definitions—The definitions of terms relating to hard-
5.3 Indicating Device—The indicating dial shall have 100
ness testing appearing in Terminology E6 shall be considered
divisions, each representing a depth of 0.0076 mm (0.00030
as applying to the terms used in this test method.
in.)penetration.Thehigherthereading,theharderthematerial.
4. Significance and Use
6. Test Parts or Specimen
4.1 The Barcol Impressor is portable and therefore useful
6.1 The testing area shall be smooth, clean, and free of
for in situ determination of the hardness of fabricated parts and
mechanical damage. The surface may be lightly polished to
individual test specimens for production control purposes.
eliminate scratches or die lines. It shall be such that it can be
4.2 This test method should be used only as cited in
essentially perpendicular to the indentor during the test.
applicable material specifications.
NOTE 2—The effect of curvature of the test specimen on the Barcol
Impressor readings is presented in Appendix X1, Fig. X1.1.
1
This test method is under the jurisdiction of ASTM Committee B07 on Light
6.2 Dimensions—Test parts or specimens shall be at least
Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on
1
1.5 mm ( ⁄16 in.) thick and large enough to ensure a minimum
Testing.
1
distance of 3 mm ( ⁄8 in.) in any direction from the indentor
Current edition approved Sept. 1, 2006. Published September 2006. Originally
approved in 1978. Last previous edition approved in 2000 as B648 – 78 (2000). point to the edge.
DOI: 10.1520/B0648-78R06.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7. Calibration
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
7.1 With the plunger upper guide backed out until it just
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. engages the spring, place the impressor on a glass surface and
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B648–78 (2006)
FIG. 2 Diagram of Barcol Impressor
toward lower numbers with time after the initial pressure. For this reason
press down until the penetrator point is forced all the way back
it is recommended that readings be made quickly and that the highest
into the lower plunger guide. The indicator should then read
observed value be used.
100 6 1. If it does not, loosen the locknut and turn the lower
1
8.4 Impressions should not be made within 3 mm ( ⁄8 in.) of
plunger guide in or out to obtain a reading of 100.
7.2 Read the hardness of a “hard” aluminum alloy reference the edge of the part or specimen or of other impressions.
disk supplied by the manufacturer of the impressor and, if
necessary, adjust so that the reading is within the range marked 9. Report
on the disk.
9.1 The report shall include the following:
7.3 Repeat the process with a “soft” reference disk.
9.1.1 Identification of material tested,
7.4 If the refe
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