ASTM A891/A891M-07

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/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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2007
• 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(2003) - Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels
• Effective Date: 01-May-2007
• Replaced By: ASTM A891/A891M-08 - Standard Specification for Precipitation Hardening Iron Base Superalloy Forgings for Turbine Rotor Disks and Wheels
• Effective Date: 01-Mar-2008
• Referred By: ASTM A788/A788M-23 - Standard Specification for Steel Forgings, General Requirements
• Effective Date: 01-May-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: A 891/A 891M – 07
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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope* 3.1.4 Include the information specified in Specification
A 788/A 788MA788/A788M.
1.1 This specification covers precipitation hardening iron
base superalloy forgings which are primarily intended for use
4. Condition and Heat Treatment
as turbine rotor disks and wheels.
4.1 The forgings covered in this specification may be
1.2 Two heat treatments are covered. Selection will depend
ordered in two different solution treated and aged conditions:
upon design, service conditions, mechanical properties, and
4.1.1 Type 1:
elevated temperature characteristics.
4.1.1.1 Solution anneal at 16506 25°F [9006 14°C] for 2
1.3 All of the provisions of Specification A 788/
to5hat temperature liquid quench.
A 788MA788/A788M, apply, except as amended herein.
4.1.1.2 Precipitation harden at 14206 15°F [7706 8°C]
1.4
for 16 h at temperature air cool; 12006 15°F [6506 8°C] for
2. Referenced Documents 16 h at temperature air cool.
2
4.1.2 Type 2:
2.1 ASTM Standards:
4.1.2.1 Solution anneal at 18006 25°F [9806 14°C] for 2
A788/A788M Specification for Steel Forgings, General Re-
to5hat temperature liquid quench.
quirements
4.1.2.2 Precipitation harden at 14206 15°F [7706 8°C]
E112 Test Methods for Determining Average Grain Size
for 16 h at temperature air cool; 12006 15°F [6506 8°C] for
E139 Test Methods for Conducting Creep, Creep-Rupture,
16 h at temperature air cool.
and Stress-Rupture Tests of Metallic Materials
E165 PracticeforLiquidPenetrantExaminationforGeneral
5. Manufacture
Industry
5.1 The material shall be made by vacuum melting followed
E292 Test Methods for Conducting Time-for-Rupture
by consumable electrode vacuum arc or electroslag remelting
Notch 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 following:
6. Chemical Requirements
3.1.1 Condition—See Section 4.
6.1 Heat Analysis—Each heat shall be analyzed by the
3.1.2 Stress Rupture Test—Parameters for material fur-
manufacturer in accordance with Specification A 788/
nished in condition 2 of 7.3.3.
A 788MA788/A788M. The chemical composition shall con-
3.1.3 Forging Drawing—Each forging shall be manufac-
form to the requirements specified in Table 1.
tured in accordance with a drawing furnished by the purchaser
showing the dimensions of the forging and the location of
7. Mechanical Properties
mechanical test specimens.
7.1 The forgings shall conform to the mechanical property
requirements specified in Table 2 after heat treatment as
prescribed in 4.1.
1
This specification is under the jurisdiction of Committee A01 on Steel,
7.2 Tension and Hardness—Tension and hardness testing
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
shall be conducted in accordance with Specification A 788/
A01.06 on Steel Forgings and Billets.
A 788MA788/A788M.
Current edition approved May 1, 2007. Published May 2007. Originally
approved in 1988. Last previous edition approved in 2003 as A 891 – 98 (2003).
7.3 Stress Rupture:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.3.1 Combinationsmoothandnotchedbarspecimensusing
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
0.252 in. [6.4 mm] diameter bars shall be tested to rupture in
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. accordance with Practice E 292E292. Rupture must occur in
*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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
A 891/A 891M – 07
TABLE 1 Chemical Composition TABLE 4 Creep Requirements
Element Heat and Product Temperature, Stress, Time, h Creep Strain, %
Analyses Range, °F [°C] ksi [MPa]
Percentage
1000 [538] 85 [585] 100 0.1–2.0
Carbon 0.05 max
Manganese 0.50 max
Silicon 0.50 max
Phosphorus 0.025 max
7.5.2 For forgings weighing 500 to 2000 lb [225
...