ASTM A891-98(2003)

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 A 788, 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-Apr-2003
• ICS: 77.140.85 - Iron and steel forgings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaces: ASTM A891-98 - Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels
• Effective Date: 10-Apr-2003
• Replaced By: ASTM A891/A891M-07 - Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels
• Effective Date: 01-May-2007

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A 891 – 98 (Reapproved 2003)
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 3.1.2 Stress Rupture Test—Parameters for material fur-
nished in condition 2 of 8.3.3.
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
elevated temperature characteristics.
4. Condition
1.3 All of the provisions of Specification A 788, apply,
4.1 The forgings covered in this specification may be
except as amended herein.
ordered in two different solution treated and aged conditions:
1.4 The values stated in inch-pound units are to be regarded
4.1.1 Type 1:
as the standard. The values given in parentheses are for
4.1.1.1 Solution anneal at 1650 6 25°F (900 6 14°C) for 2
information only.
to5hat temperature liquid quench.
2. Referenced Documents 4.1.1.2 Precipitation harden at 1420 6 15°F (770 6 8°C)
for 16 h at temperature air cool; 1200 6 15°F (650 6 8°C) for
2.1 ASTM Standards:
16 h at temperature air cool.
A 788 Specification for Steel Forgings, General Require-
4.1.2 Type 2:
ments
4.1.2.1 Solution anneal at 1800 6 25°F (980 6 14°C) for 2
E 112 Test Methods for Determining the Average Grain
to5hat temperature liquid quench.
Size
4.1.2.2 Precipitation harden at 1420 6 15°F (770 6 8°C)
E 139 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
4 16 h at temperature air cool.
E 165 Test Methods for Liquid Penetrant Examination
E 292 Test Methods for Conducting Time-for-Rupture
5. Manufacture
Notch Tension Tests of Materials
5.1 The material shall be made by vacuum melting followed
3. Ordering Information by consumable electrode vacuum arc or electroslag remelting
as agreed upon between producer and user.
3.1 Orders for material under this specification shall include
5.2 The forgings shall be upset forged so that the axis of the
the information specified in Specification A 788 and the
disk corresponds with that of the ingot.
following:
3.1.1 Condition—See Section 4.
6. Chemical Requirements
6.1 Heat Analysis—Each heat shall be analyzed by the
manufacturer in accordance with Specification A 788. The
This specification is under the jurisdiction of Committee A01 on Steel,
chemical composition shall conform to the requirements speci-
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets. fied in Table 1.
Current edition approved April 10, 2003. Published July 2003. Originally
approved in 1988. Last previous edition approved in 1998 as A 891 – 98.
7. Heat Treatment
Annual Book of ASTM Standards, Vol 01.05.
7.1 The forgings shall be heat treated in accordance with
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 03.03. 4.1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 891 – 98 (2003)
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
8.5.3 For forgings weighing over 2000 lb (907 kg) testing
8. Mechanical Properties
shall be performed as covered in 8.5.1.2 or in Supplementary
8.1 The forgings shall conform to the mechanical property
Requirement S1. In addition, one tangential tension, stress
requirements specified in Table 2 after heat treatment as
rupture, and creep test shall be run on material taken from the
prescribed in 4.1.
forging hub.
8.2 Tension and Hardness—Tension and hardness testing
8.6 Test Location:
shall be conducted in accordance with Specification A 788.
8.6.1 The tension, stress rupture, and creep specimens
8.3 Stress Rupture:
covered in 8.5.1 and 8.5.2 shall be machined from tangential
8.3.1 Combinationsmoothandnotchedbarspecimensusing
bars taken from the forging rim.
0.252 in. (6.4 mm) diameter bars shall be tested to rupture in
8.6.2 Hardness tests shall be taken on both the rim and hub.
accordance with Practice E 292. Rupture must occur in the
smooth section of each specimen.After 100 h, samples may be
9. Microstructure
uploaded in 5-ksi (35-MPa) increments in 8 to 16 h intervals.
9.1 The forgings shall have an average grain size of number
8.3.2 Material supplied as Type 1 shall meet the stress
4 or finer as determined in accordance with Test Methods
rupture requirements specified in Table 3.
E 112. The material shall be of a uniform microstructure, free
8.3.3 Material supplied as Type 2 shall meet the stress
of phase or com
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