ASTM B597-92(1998)
(Practice)Standard Practice for Heat Treatment of Aluminum Alloys (Withdrawn 2002)
Standard Practice for Heat Treatment of Aluminum Alloys (Withdrawn 2002)
SCOPE
1.1 This practice is intended as an aid in establishing a suitable procedure for the heat treatment of aluminum alloys.
1.2 Times and temperatures appearing in the heat treatment tables are typical for various forms, sizes, and manufacturing methods and may not provide the optimum heat treatment for a specific item.
1.3 Some alloys in the 6XXX series may achieve the T4 temper by quenching from within the solution temperature range during or immediately following a hot working process, such as upon emerging from an extrusion die. Such alternatives to furnace heating and immersion quenching are indicated by footnote O, of the table for heat treatment of wrought aluminum alloys. However, this practice does not cover the requirements for a controlled press heat treatment. (A practice for press solution heat treatment of aluminum alloys is being developed.)
General Information
Standards Content (Sample)
Designation: B 597 – 92 (Reapproved 1998)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
1
Heat Treatment of Aluminum Alloys
This standard is issued under the fixed designation B 597; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * 3.1.1 The definitions relating to heat treatment of metals
appearing in Definitions E 44 are considered as applying to this
1.1 This practice is intended as an aid in establishing a
practice.
suitable procedure for the heat treatment of aluminum alloys.
1.2 Times and temperatures appearing in the heat treatment
4. Apparatus
tables are typical for various forms, sizes, and manufacturing
4.1 Aluminum alloys are usually heat treated in molten salt
methods and may not provide the optimum heat treatment for
baths or air chamber furnaces; however, lead baths, oil baths,
a specific item.
fluidized beds, or even superheated steam may be used in
1.3 Some alloys in the 6XXX series may achieve the T4
specific applications. However the use of uncontrolled heating
temper by quenching from within the solution temperature
is not permitted. Whichever heating means are employed,
range during or immediately following a hot working process,
careful evaluation is required to ensure that the alloy being heat
such as upon emerging from an extrusion die. Such alternatives
treated responds properly to heat treatment and is not damaged
to furnace heating and immersion quenching are indicated by
by overheating or by the heat treatment environment.
footnote K of the table for heat treatment of wrought aluminum
4.1.1 Salt Baths heat the work rapidly and uniformly. The
alloys. However, this practice does not cover the requirements
temperature of the bath can be closely controlled, an important
for a controlled press heat treatment. (A practice for press
consideration in solution heat treatment of wrought-aluminum
solution heat treatment of aluminum alloys is being devel-
alloys. Salt baths are not recommended for heat treatment of
oped.)
casting alloys. High-temperature oxidation of aluminum is not
2. Referenced Documents a problem in salt baths.
2.1 The following documents of the issue in effect on the
NOTE 1—Warning: Nitrate baths must not be used in the heat treatment
date of material purchase form a part of this specification to the
of 5xx.x series casting alloys because of a possible explosion.
extent referenced herein:
4.1.2 Air-Chamber Furnaces may be oil- or gas-fired or
2.2 ASTM Standards:
may be electrically heated. The atmosphere in air chamber
B 275 Practice for Codification of Certain Nonferrous Met-
furnaces must be controlled to prevent porosity resulting from
2
als and Alloys, Cast and Wrought
solution heat treatment. Furnace components that are signifi-
B 557 Test Methods of Tension Testing Wrought and Cast
cantly hotter than the metal should be suitably shielded for
2
Aluminum- and Magnesium-Alloy Products
metal less than 0.250 in. thick to prevent adverse radiation
E 44 Definitions of Terms Relating to Heat Treatment of
effects. The suitability of the atmosphere in an air-chamber
3
Metals
furnace can be demonstrated by determining by test that
2.3 American National Standard:
products processed in that furnace are substantially free of
H35.1 Alloy and Temper Designation Systems for Alumi-
porosity resulting from solution heat treatment.
4
num
NOTE 2—Porosity resulting from solution heat treatment may lower
mechanical properties and commonly causes blistering of the surface of
3. Terminology
the material. The condition is most likely in furnaces in which the products
3.1 Definitions:
of combustion contact the work, particularly if the gases are high in water
vapor or contain compounds of sulfur. In general, the high-strength
1 wrought alloys of the 2000 and 7000 series are most susceptible,
This recommended practice is under the jurisdiction of ASTM Committee B-7
particularly in the extruded form or as forgings, and casting alloys in the
on Light Metals and Alloys and is the direct responsibility of Subcommittee B07.03
300 series. Low-strength and alclad (two sides) alloys are practically
on Aluminum Alloy Wrought Products and Subcommittee B07.01 on Aluminum
Alloy Ingots and Castings. immune to this type of damage. Anodic films and proprietary heat-treat
Current edition approved January 15, 1992. Published March 1992. Originally
coatings are also useful in protecting against porosity resulting from
published as B 597 – 74. Last previous edition B 597 – 90.
solution heat treatment. Surface discoloration is a normal result of solution
...
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