ASTM A891-98

Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels

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 A788, apply, except as amended herein.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

General Information

• Status: Historical
• Publication Date: 09-Sep-1998
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaced By: ASTM A891-98(2003) - Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels
• Effective Date: 10-Apr-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 891 – 98
Standard Specification for
Precipitation Hardening Iron Base Superalloy Forgings for
Turbine Rotor Disks and Wheels
This standard is issued under the fixed designation A 891; 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 3.1.3 Forging Drawing—Each forging shall be manufac-
tured in accordance with a drawing furnished by the purchaser
1.1 This specification covers precipitation hardening iron
showing the dimensions of the forging and the location of
base superalloy forgings which are primarily intended for use
mechanical test specimens.
as turbine rotor disks and wheels.
1.2 Two heat treatments are covered. Selection will depend
4. Condition
upon design, service conditions, mechanical properties, and
4.1 The forgings covered in this specification may be
elevated temperature characteristics.
ordered in two different solution treated and aged conditions:
1.3 All of the provisions of Specification A 788, apply,
4.1.1 Type 1:
except as amended herein.
4.1.1.1 Solution anneal at 1650 6 25°F (900 6 14°C) for 2
1.4 The values stated in inch-pound units are to be regarded
to5hat temperature liquid quench.
as the standard. The values given in parentheses are for
4.1.1.2 Precipitation harden at 1420 6 15°F (770 6 8°C)
information only.
for 16 h at temperature air cool; 1200 6 15°F (650 6 8°C) for
2. Referenced Documents 16 h at temperature air cool.
4.1.2 Type 2:
2.1 ASTM Standards:
4.1.2.1 Solution anneal at 1800 6 25°F (980 6 14°C) for 2
A 788 Specification for Steel Forgings, General Require-
to5hat temperature liquid quench.
ments
4.1.2.2 Precipitation harden at 1420 6 15°F (770 6 8°C)
E 112 Test Methods for Determining the Average Grain
for 16 h at temperature air cool; 1200 6 15°F (650 6 8°C) for
Size
16 h at temperature air cool.
E 139 Practice for Conducting Creep, Creep-Rupture, and
Stress-Rupture Tests of Metallic Materials
5. Manufacture
E 165 Practice for Liquid Penetrant Examination
5.1 The material shall be made by vacuum melting followed
E 292 Practice for Conducting Time-for-Rupture Notch
by consumable electrode vacuum arc or electroslag remelting
Tension Tests of Materials
as agreed upon between producer and user.
3. Ordering Information 5.2 The forgings shall be upset forged so that the axis of the
disk corresponds with that of the ingot.
3.1 Orders for material under this specification shall include
the information specified in Specification A 788 and the
6. Chemical Requirements
following:
6.1 Heat Analysis—Each heat shall be analyzed by the
3.1.1 Condition—See Section 4.
manufacturer in accordance with Specification A 788. The
3.1.2 Stress Rupture Test—Parameters for material fur-
chemical composition shall conform to the requirements speci-
nished in condition 2 of 8.3.3.
fied in Table 1.
1 7. Heat Treatment
This specification is under the jurisdiction of Committee A-1 on Steel, Stainless
Steel, and Related Alloys and is the direct responsibility of Subcommittee A01.06
7.1 The forgings shall be heat treated in accordance with
on Steel Forgings and Billets.
4.1.
Current edition approved Sept. 10, 1998. Published December 1998. Originally
published as A 891 – 88. Last previous edition A 891 – 90 (Reapproved 1995).
Annual Book of ASTM Standards, Vol 01.05.
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 03.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 891–98
TABLE 1 Chemical Composition TABLE 3 Stress Rupture Requirements
Element Heat and Product Product Analysis Test Temp, Stress, Min h Min
Analyses Range, Tolerance—Over or °F [°C] ksi [MPa] Elongation in
Percentage Under 4, %
Carbon 0.05 max 0.01 Type 1 1200 [649] 56 [385] 100 15
Manganese 0.50 max 0.03 Type 2
Silicon 0.50 max 0.05 Test A 1200 [649] 56 [385] 100 8
Phosphorus 0.025 max 0.005 Test B 1200 [649] 65 [450] 30 10
Sulfur 0.015 max 0.005
Chromium 13.50–16.00 0.20
Nickel 24.00–27.00 0.20
TABLE 4 Creep Requirements
Molybdenum 1.00–1.50 0.05
Titanium 1.90–2.35 0.07
Temperature, Stress, Time, h Creep Strain, %
Boron 0.003–0.010 0.001 over
°F [°C] ksi [MPa]
0.0004 under
1000 [538] 85 [585] 100 0.1–2.0
Vanadium 0.10–0.50 0.03
Aluminum 0.35 max 0.05
Iron remainder
8.5.2 For forgings weighing 500 lb to 2000 lb [227 kg to
907 kg] one tension, stress rupture, and creep test, and two
8. Mechanical Properties
hardness tests shall be made on each forging.
8.1 The forgings shall conform to the mechanical property
8.5.3 For forgings weighing over 2000 lb [907 kg] testing
requirements specified in Table 2 after heat treatment as
shall be performed as covered in 8.5.1.2 or in Supplementary
prescribed in 4.1.
Requirement S1. In addition, one tangential tension, stress
8.2 Tension and Hardness—Tension and hardness testing
rupture, and creep test shall be run on material taken from the
shall be conducted in accordance with Specification A 788.
forging hub.
8.3 Stress Rupture:
8.6 Test Location:
8.3.1 Combination smooth and notched bar specimens using
8.6.1 The tension, stress rupture, and creep specimens
0.252 in. [6.4 mm] diameter bars shall be tested to rupture in
accordance with Practice E 292. Rupture must occur in the covered in 8.5.1 and 8.5.2 shall be machined from tangential
bars taken from the forging rim.
smooth section of each specimen. After 100 h, samples may be
uploaded in 5-ksi [35-MPa] increments in 8 to 16 h intervals.
8.6.2 Hardness tests shall be taken on both the rim and hub.
8.3.2 Material supplied as Type 1 shall meet the stress
rupture requirements specified in Table 3.
9. Microstructure
8.3.3 Material supplied as Type 2 shall meet the stress
9.1 The forgings shall have an average grain size of numbe
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