ASTM B917/B917M-08
(Practice)Standard Practice for Heat Treatment of Aluminum-Alloy Castings from All Processes
Standard Practice for Heat Treatment of Aluminum-Alloy Castings from All Processes
ABSTRACT
This practice covers the requirements for the heat treatment of aluminum alloy castings from any casting process such as investment casting, permanent mould casting, sand casting, and others. It excludes castings that are used in specific aerospace applications or those made from wrought aluminum alloys. The aluminum alloys should be subjected to controlled heat treatment using the usual air chamber furnace or other heating media like lead baths, oil baths, fluidized beds, or even superheated steam. Air chambers may be oil or gas fired or may also be electrically heated but the atmosphere inside each should be controlled to prevent porosity. Quenching is normally performed by immersing castings in a hot-water bath. It is important that the furnace be calibrated before it is used initially and after any change in the furnace. Likewise, temperature-measurement systems should be regularly checked for accuracy.
SCOPE
1.1 This practice covers, when specified by material specification or purchase order, the heat treatment of aluminum alloy castings from all casting processes.
1.1.1 The heat treatment of aluminum alloy castings used in specific aerospace applications is covered in AMS 2771 and specific AMS material specifications.
1.1.2 The heat treatment of wrought aluminum alloys is covered in Practice B 918.
1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standards. The SI units are shown in brackets or in separate tables. The values stated in each system are not exact equivalents, therefore each system must be used independent of the other. Combining values from the two systems may result in non-conformance with the practice.
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.
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Standards Content (Sample)
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Designation:B917/B917M–08
Standard Practice for
Heat Treatment of Aluminum-Alloy Castings from All
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Processes
This standard is issued under the fixed designation B917/B917M; 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.
Note—Table 1 and section 7.1 updated and the year date was changed on Aug. 7, 2008.
1. Scope* B275 Practice for Codification of Certain Nonferrous Met-
als and Alloys, Cast and Wrought
1.1 This practice covers, when specified by material speci-
B557 Test Methods for Tension Testing Wrought and Cast
fication or purchase order, the heat treatment of aluminum
Aluminum- and Magnesium-Alloy Products
alloy castings from all casting processes.
B557M TestMethodsforTensionTestingWroughtandCast
1.1.1 The heat treatment of aluminum alloy castings used in
2
Aluminum- and Magnesium-Alloy Products (Metric)
specific aerospace applications is covered in AMS 2771 and
2
B618 Specification for Aluminum-Alloy Investment Cast-
specific AMS material specifications.
ings
1.1.2 The heat treatment of wrought aluminum alloys is
B686 Specification for Aluminum Alloy Castings, High-
covered in Practice B918.
Strength
1.2 The values stated in either inch-pound units or SI units
B881 TerminologyRelatingtoAluminum-andMagnesium-
are to be regarded separately as standards. The SI units are
Alloy Products
shown in brackets or in separate tables. The values stated in
B918 Practice for Heat Treatment of Wrought Aluminum
each system are not exact equivalents, therefore each system
Alloys
must be used independent of the other. Combining values from
G110 Practice for Evaluating Intergranular Corrosion Re-
the two systems may result in non-conformance with the
sistanceofHeatTreatableAluminumAlloysbyImmersion
practice.
in Sodium Chloride + Hydrogen Peroxide Solution
1.3 This standard does not purport to address all of the
2.3 ANSI Standard:
safety concerns, if any, associated with its use. It is the
H35.1 Alloy and Temper Designation Systems for Alumi-
responsibility of the user of this standard to establish appro-
4
num
priate safety and health practices and determine the applica-
2.4 SAE Standard:
bility of regulatory limitations prior to use.
AMS 2771 Heat Treatment of Aluminum Alloy Castings
2. Referenced Documents
3. Terminology
2.1 The following documents of the issue in effect on the
3.1 Definitions:
dateofmaterialpurchaseformapartofthisspecificationtothe
3.1.1 RefertoTerminologyB881forterminologyrelatingto
extent referenced herein:
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the heat treatment of castings.
2.2 ASTM Standards:
B26/B26M Specification for Aluminum-Alloy Sand Cast-
4. Equipment
ings
4.1 Heating Media—Aluminum castings are typically heat
B108 Specification for Aluminum-Alloy Permanent Mold
treated in air chamber furnaces; however, lead baths, oil baths,
Castings
fluidized beds, or even superheated steam may be used in
specific applications. The use of uncontrolled heating is not
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This practice is under the jurisdiction of ASTM Committee B07 on Light
permitted. Whichever heating means are employed, careful
Metals and Alloys and is the direct responsibility of Subcommittee B07.01 on
evaluation is required to ensure that the casting responds
Aluminum Alloy Ingots and Castings.
Current edition approved Aug. 7, 2008. Published August 2008. Originally properly to heat treatment and is not overheated or damaged by
approved in 2001. Last previous edition approved in 2007 as B917/B917M – 2007.
the heat treatment environment. Salt baths are not recom-
DOI: 10.1520/B0917_B0917M-08.
mended for the commercial heat treatment of aluminum
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Available from Society of Automotive Engineers (SAE), 400 Commonwealth
Dr., Warrendale, PA 15096-0001, http://www.sae.org.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4
Standards volume information, refer to the standard’s Document Summary page on Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600,
the ASTM website. Arlington, VA 22209, http://www.aluminum.org.
*ASummary 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.
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B917/B917M–08
castings in volume. (Warning—Nitrate baths must not be used 5.2 Furnace Temperature Survey:
in the heat treatment of 5xx.0 series castings because of the
5.2.1 A temperature survey, to ensure compliance with the
inherent explosion hazard.
applicable recommendations presented herein, shall be per-
4.2
...
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