ASTM A897/A897M-06

Standard Specification for Austempered Ductile Iron Castings

ABSTRACT
This specification covers ductile iron castings that are subsequently heat treated by an austempering process. The chemical composition requirements may be agreed upon between the manufacturer, heat treater, and the purchaser. Requirements for the microstructure constituents such as graphite, ausferrite (acicular ferrite and high carbon, stable austenite), pearlite, and martensite are prescribed. The iron shall conform to the mechanical property requirements including tensile strength, yield strength, elongation, impact energy, and Brinell hardness. Castings shall be heat treated by an austempering process detailed in this specification. The standard specimens for tension and Charpy impact tests are illustrated.
SCOPE
1.1 This specification covers ductile iron castings that are subsequently heat treated by an austempering process as defined in .
1.2 The application of the austempering heat treatment extends the range of properties achievable in ductile iron castings.
1.3 No precise quantitative relationship can be stated between the properties of the iron in various locations of the same casting or between the properties of castings and those of a test specimen cast from the same iron (see ). However, austempering heat treatment will tend to diminish any differences in mechanical properties.
1.4 The production of castings, machining (if required), and the austempering heat treatments may be performed by different manufacturers, as covered in Section . The purchaser should establish by contract agreement, at the time of ordering, the responsibility of the various parties for meeting the specification requirements.
1.5 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets [ ]. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 31-Jan-2006
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.02 - Malleable and Ductile Iron Castings

Relations

• Replaces: ASTM A897/A897M-03 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-Feb-2006
• Replaced By: ASTM A897/A897M-06(2011) - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-Nov-2011
• Referred By: ASTM A1095-15(2019) - Standard Specification for High-Silicon Molybdenum Ferritic Iron Castings
• Effective Date: 01-Feb-2006
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 01-Feb-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: A897/A897M – 06
Standard Specification for
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Austempered Ductile Iron Castings
This standard is issued under the fixed designationA897/A897M; 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 A834 Specification for Common Requirements for Iron
Castings for General Industrial Use
1.1 This specification covers ductile iron castings that are
E8 Test Methods for Tension Testing of Metallic Materials
subsequently heat treated by an austempering process as
E10 Test Method for Brinell Hardness of Metallic Materials
defined in 10.1.
E23 Test Methods for Notched Bar Impact Testing of
1.2 The application of the austempering heat treatment
Metallic Materials
extends the range of properties achievable in ductile iron
2.2 Military Standard:
castings.
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MIL-STD-129 Military Marking for Shipment and Storage
1.3 No precise quantitative relationship can be stated be-
tweenthepropertiesoftheironinvariouslocationsofthesame
3. Ordering Information
casting or between the properties of castings and those of a test
3.1 Orders for material to this specification shall include the
specimen cast from the same iron (see Appendix X1). How-
following information:
ever, austempering heat treatment will tend to diminish any
3.1.1 ASTM designation, with year of issue,
differences in mechanical properties.
3.1.2 Grade of austempered ductile iron required (see Table
1.4 The production of castings, machining (if required), and
1 and Sections 6 and 7),
the austempering heat treatments may be performed by differ-
3.1.3 Chemical composition requirements, if any (see Sec-
ent manufacturers, as covered in Section 15. The purchaser
tion 4),
should establish by contract agreement, at the time of ordering,
3.1.4 Heat treated microstructure restrictions (see Section
the responsibility of the various parties for meeting the
10),
specification requirements.
3.1.5 Test coupon criteria (see Section 12),
1.5 The values stated in either inch-pound or SI units are to
3.1.6 Lot size and tests per lot (see 12.6 and Section 15),
be regarded separately as standard.Within the text, the SI units
3.1.7 Special requirements, if desired, including hardness,
are shown in brackets [ ]. The values stated in each system are
radiographic soundness, magnetic particle inspection, pressure
not exact equivalents; therefore, each system shall be used
tightness, dimensions, or surface finish (see Section 9),
independently of the other. Combining values from the two
3.1.8 Certification, if required (see Section 16),
systems may result in nonconformance with the specification.
3.1.9 Special preparation for delivery, if required (see Sec-
2. Referenced Documents tion 17).
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2.1 ASTM Standards:
4. Chemical Composition
A247 Test Method for Evaluating the Microstructure of
4.1 Although this specification has no specific chemical
Graphite in Iron Castings
requirements, such requirements may be agreed upon between
A370 Test Methods and Definitions for Mechanical Testing
the manufacturer, heat treater, and the purchaser.
of Steel Products
A732/A732M Specification for Castings, Investment, Car-
5. Microstructure
bon and Low Alloy Steel for General Application, and
5.1 The graphite component of the microstructure shall
Cobalt Alloy for High Strength at Elevated Temperatures
consist of a minimum 80 % spheroidal graphite conforming to
Types I and II per Test Method A247.
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This specification is under the jurisdiction of ASTM Committee A04 on Iron 5.2 The matrix microstructure shall substantially consist of
Castings and is the direct responsibility of SubcommitteeA04.02 on Malleable and
ausferrite (acicular ferrite and high carbon, stable austenite).
Ductile Iron Castings.
Proeutectoid ferrite will also be present in Grade 110/70/11
Current edition approved Feb. 1, 2006. Published February 2006. Originally
[750/500/11].
approved in 1990. Last previous edition approved in 2003 as A897/A897M - 03.
DOI: 10.1520/A0897_A0897M-06.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
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the ASTM website. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.
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A897/A897M – 06
TABLE 1 Mechanical Property Requirements of Grades
Inch-pound units Grade Grade Grade Grade Gra
...