ASTM A891/A891M-08
(Specification)Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels
Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels
ABSTRACT
This specification covers precipitation hardened iron base superalloy forgings which are primarily intended for use as turbine rotor disks and wheels. Two heat treatments are covered and selection will depend upon design, service conditions, mechanical properties, and elevated temperature characteristics. The material shall be made by vacuum melting followed by consumable electrode vacuum arc or electroslag remelting. The forgings shall undergo the following tests: tension test, hardness test, stress rupture test, and creep test. Also, the forgings shall be subjected to non-destructive examinations like ultrasonic examination and liquid penetrant examination. The forgings shall be uniform in quality and condition, clean, sound, and free of cracks, seams, laps, shrinkage, and other injurious imperfections.
SCOPE
1.1 This specification covers precipitation hardening iron base superalloy forgings which are primarily intended for use as turbine rotor disks and wheels.
1.2 Two heat treatments are covered. Selection will depend upon design, service conditions, mechanical properties, and elevated temperature characteristics.
1.3 All of the provisions of Specification A 788/A 788M, apply, except as amended herein.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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Designation: A891/A891M – 08
Standard Specification for
Precipitation Hardening Iron Base Superalloy Forgings for
1
Turbine Rotor Disks and Wheels
This standard is issued under the fixed designationA891/A891M; 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* 3.1.2 Stress Rupture Test—Parameters for material fur-
nished in condition 2 of 7.3.3.
1.1 This specification covers precipitation hardening iron
3.1.3 Forging Drawing—Each forging shall be manufac-
base superalloy forgings which are primarily intended for use
tured in accordance with a drawing furnished by the purchaser
as turbine rotor disks and wheels.
showing the dimensions of the forging and the location of
1.2 Two heat treatments are covered. Selection will depend
mechanical test specimens.
upon design, service conditions, mechanical properties, and
3.1.4 Include the information specified in Specification
elevated temperature characteristics.
A788/A788M.
1.3 All of the provisions of Specification A788/A788M,
apply, except as amended herein.
4. Condition and Heat Treatment
1.4 The values stated in either SI units or inch-pound units
4.1 The forgings covered in this specification may be
are to be regarded separately as standard. The values stated in
ordered in two different solution treated and aged conditions:
each system may not be exact equivalents; therefore, each
4.1.1 Type 1:
system shall be used independently of the other. Combining
4.1.1.1 Solution anneal at 1650 6 25°F [900 6 14°C] for 2
values from the two systems may result in non-conformance
to5hat temperature liquid quench.
with the standard.
4.1.1.2 Precipitation harden at 1420 6 15°F [770 6 8°C]
2. Referenced Documents for 16 h at temperature air cool; 1200 6 15°F [650 6 8°C] for
2
16 h at temperature air cool.
2.1 ASTM Standards:
4.1.2 Type 2:
A788/A788M Specification for Steel Forgings, General Re-
4.1.2.1 Solution anneal at 1800 6 25°F [980 6 14°C] for 2
quirements
to5hat temperature liquid quench.
E112 Test Methods for Determining Average Grain Size
4.1.2.2 Precipitation harden at 1420 6 15°F [770 6 8°C]
E139 Test Methods for Conducting Creep, Creep-Rupture,
for 16 h at temperature air cool; 1200 6 15°F [650 6 8°C] for
and Stress-Rupture Tests of Metallic Materials
16 h at temperature air cool.
E165 PracticeforLiquidPenetrantExaminationforGeneral
Industry
5. Manufacture
E292 Test Methods for Conducting Time-for-Rupture
5.1 The material shall be made by vacuum melting followed
Notch Tension Tests of Materials
by consumable electrode vacuum arc or electroslag remelting
3. Ordering Information as agreed upon between producer and user.
5.2 The forgings shall be upset forged so that the axis of the
3.1 Orders for material under this specification shall include
disk corresponds with that of the ingot.
the following:
3.1.1 Condition—See Section 4.
6. Chemical Requirements
6.1 Heat Analysis—Each heat shall be analyzed by the
1
This specification is under the jurisdiction of Committee A01 on Steel,
manufacturer in accordance with Specification A788/A788M.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
The chemical composition shall conform to the requirements
A01.06 on Steel Forgings and Billets.
specified in Table 1.
Current edition approved March 1, 2008. Published March 2008. Originally
approved in 1988. Last previous edition approved in 2007 as A891/A891M – 07. 6.2 Product Analysis—The purchaser may obtain a product
DOI: 10.1520/A0891_A0891M-08.
analysis, representing each heat or multiple heat, in accordance
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
with the provisions of Specification A788/A788M.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary 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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A891/A891M – 08
TABLE 1 Chemical Composition TABLE 3 Stress Rupture Requirements
Element Heat Analysis Range, Test Temp, Stress, Min, h Min,
Percentage °F [°C] ksi [MPa] Elongation in
4D, %
Carbon 0.05 max
Manganese 0.50 max
Type 1 1200 [650] 56 [385] 100 15
Silicon 0.50 max Type 2
Phosphorus 0.025 max
Test A 1200 [650] 56 [385] 100 8
Sulfur 0.015 max
Test B 1200 [650] 65 [450] 30 10
Chromium 13.50–16.00
Nickel 24.00–27.00
Molybdenum 1.00–1.50
TABLE 4 Creep Requirements
Titanium 1.90–2.35
Boron 0.003–0.010
Tem
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:A 891–98 (Reapproved 2003) Designation: A 891/A 891M – 08
Standard Specification for
Precipitation Hardening Iron Base Superalloy Forgings for
1
Turbine Rotor Disks and Wheels
This standard is issued under the fixed designationA891/A891M; 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*
1.1 This specification covers precipitation hardening iron base superalloy forgings which are primarily intended for use as
turbine rotor disks and wheels.
1.2 Twoheattreatmentsarecovered.Selectionwilldependupondesign,serviceconditions,mechanicalproperties,andelevated
temperature characteristics.
1.3 All of the provisions of Specification A 788/A 788M, apply, except as amended herein.
1.4The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information
only.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A788 788/A 788M Specification for Steel Forgings, General Requirements
E 112 Test Methods for Determining the Average Grain Size
E 139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
E 165 Test MethodsMethod for Liquid Penetrant Examination
E 292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials
3. Ordering Information
3.1Orders for material under this specification shall include the information specified in Specification A788 and the following:
Ordering Information
3.1 Orders for material under this specification shall include the following:
3.1.1 Condition—See Section 4.
3.1.2 Stress Rupture Test—Parameters for material furnished in condition 2 of 8.3.37.3.3.
3.1.3 ForgingDrawing—Each forging shall be manufactured in accordance with a drawing furnished by the purchaser showing
the dimensions of the forging and the location of mechanical test specimens.
3.1.4 Include the information specified in Specification A 788/A 788M.
4. Condition Condition and Heat Treatment
4.1 The forgings covered in this specification may be ordered in two different solution treated and aged conditions:
4.1.1 Type 1:
4.1.1.1 Solution anneal at 1650 6 25°F (900[900 6 14°C)14°C] for 2 to5hat temperature liquid quench.
4.1.1.2 Precipitation harden at 1420 6 15°F (770[770 6 8°C)8°C] for 16 h at temperature air cool; 1200 6 15°F (650[650 6
8°C)8°C] for 16 h at temperature air cool.
4.1.2 Type 2:
4.1.2.1 Solution anneal at 1800 6 25°F (980[980 6 14°C)14°C] for 2 to5hat temperature liquid quench.
1
This specification is under the jurisdiction of CommitteeA01 on Steel, Stainless Steel,Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.06
on Steel Forgings and Billets.
Current edition approved April 10, 2003.March 1, 2008. Published July 2003.March 2008. Originally approved in 1988. Last previous edition approved in 19982007 as
A891–98.A 891/A 891M – 07.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
, Vol 01.05.volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary 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.
1
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A 891/A 891M – 08
4.1.2.2 Precipitation harden at 1420 6 15°F (770[770 6 8°C)8°C] for 16 h at temperature air cool; 1200 6 15°F (650[650 6
8°C)8°C] for 16 h at temperature air cool.
5. Manufacture
5.1 The material shall be made by vacuum melting followed by consumable electrode vacuum arc or electroslag remelting as
agreed upon between producer and user.
5.2 The forgings shall be upset forged so that the axis of the disk corresponds with that of the ingot.
6.Chemical Requirements Chemical Requirements
6. Chemical Requirements
6.1 Heat Analysis—Each heat shall be analyzed by the manufacturer in accordance with Specification A 788/A 788M. The
chemical composition
...
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