ASTM B648-78(2000)
(Test Method)Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor
Standard Test Method for Indentation Hardness of Aluminum Alloys by Means of a Barcol Impressor
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.
1.3This 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:B648–78 (Reapproved 2000)
Standard Test Method for
Indentation Hardness of Aluminum Alloys by Means of a
Barcol Impressor
This standard is issued under the fixed designation B 648; 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 4.2 This test method should be used only as cited in
applicable material specifications.
1.1 Thistestmethodcoversthedeterminationofindentation
hardness of aluminum alloys using a Barcol Impressor, Model
5. Apparatus
No. 934-1.
5.1 Barcol Impressor, Model 934-1— See Fig. 1 and Fig. 2.
1.2 The values stated in SI units are to be regarded as the
5.2 Indentor—The indentor shall consist of a hardened steel
standard. The values given in parentheses are for information
truncated cone having an angle of 26° with a flat tip 0.157 mm
only.
(0.0062 in.) in diameter. It shall fit into a hollow spindle and be
NOTE 1—Another model, No. 935, is for use on plastics but is not
held down by a spring-loaded plunger. See Fig. 2.
included in this test method and should not be used for aluminum alloys.
5.3 Indicating Device—The indicating dial shall have 100
1.3 This standard does not purport to address all of the
divisions, each representing a depth of 0.0076 mm (0.00030
safety concerns, if any, associated with its use. It is the
in.)penetration.Thehigherthereading,theharderthematerial.
responsibility of the user of this standard to establish appro-
6. Test Parts or Specimen
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6.1 The testing area shall be smooth, clean, and free of
mechanical damage. The surface may be lightly polished to
2. Referenced Documents
eliminate scratches or die lines. It shall be such that it can be
2.1 ASTM Standards:
essentially perpendicular to the indentor during the test.
E 6 Terminology Relating to Methods of Mechanical Test-
NOTE 2—The effect of curvature of the test specimen on the Barcol
ing
Impressor readings is presented in Appendix X1, Fig. X1.1.
E 10 Test Method for Brinell Hardness of Metallic Materi-
2 6.2 Dimensions—Test parts or specimens shall be at least
als
1.5 mm ( ⁄16 in.) thick and large enough to ensure a minimum
E 18 Test Methods for Rockwell Hardness and Rockwell
2 distance of 3 mm ( ⁄8 in.) in any direction from the indentor
Superficial Hardness of Metallic Materials
point to the edge.
3. Terminology
7. Calibration
3.1 Definitions—The definitions of terms relating to hard-
7.1 With the plunger upper guide backed out until it just
ness testing appearing in Terminology E 6 shall be considered
engages the spring, place the impressor on a glass surface and
as applying to the terms used in this test method.
press down until the penetrator point is forced all the way back
4. Significance and Use into the lower plunger guide. The indicator should then read
100 6 1. If it does not, loosen the locknut and turn the lower
4.1 The Barcol Impressor is portable and therefore useful
plunger guide in or out to obtain a reading of 100.
for in situ determination of the hardness of fabricated parts and
7.2 Read the hardness of a “hard” aluminum alloy reference
individual test specimens for production control purposes.
disk supplied by the manufacturer of the impressor and, if
necessary, adjust so that the reading is within the range marked
This test method is under the jurisdiction of ASTM Committee B07 on Light on the disk.
Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on
7.3 Repeat the process with a “soft” reference disk.
Testing.
7.4 If the reference readings cannot be obtained, subsequent
Current edition approved Sept. 29, 1978. Published December 1978.
measurements are not valid.
Annual Book of ASTM Standards, Vol 03.01.
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B648–78 (2000)
division (Note 4). Take care to avoid sliding or scraping while
the indentor is in contact with the surface b
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