1、Designation: A 891/A 891M 08Standard Specification forPrecipitation Hardening Iron Base Superalloy Forgings forTurbine Rotor Disks and Wheels1This standard is issued under the fixed designation A 891/A 891M; the number immediately following the designation indicates the yearof original adoption or,
2、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 ironbase superalloy forgings
3、which are primarily intended for useas turbine rotor disks and wheels.1.2 Two heat treatments are covered. Selection will dependupon design, service conditions, mechanical properties, andelevated temperature characteristics.1.3 All of the provisions of Specification A 788/A 788M,apply, except as ame
4、nded herein.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conf
5、ormancewith the standard.2. Referenced Documents2.1 ASTM Standards:2A 788/A 788M Specification for Steel Forgings, GeneralRequirementsE112 Test Methods for Determining Average Grain SizeE 139 Test Methods for Conducting Creep, Creep-Rupture,and Stress-Rupture Tests of Metallic MaterialsE 165 Test Me
6、thod for Liquid Penetrant ExaminationE 292 Test Methods for Conducting Time-for-RuptureNotch Tension Tests of Materials3. Ordering Information3.1 Orders for material under this specification shall includethe following:3.1.1 ConditionSee Section 4.3.1.2 Stress Rupture TestParameters for material fur-
7、nished in condition 2 of 7.3.3.3.1.3 Forging DrawingEach forging shall be manufac-tured in accordance with a drawing furnished by the purchasershowing the dimensions of the forging and the location ofmechanical test specimens.3.1.4 Include the information specified in SpecificationA 788/A 788M.4. Co
8、ndition and Heat Treatment4.1 The forgings covered in this specification may beordered in two different solution treated and aged conditions:4.1.1 Type 1:4.1.1.1 Solution anneal at 1650 6 25F 900 6 14C for 2to5hattemperature liquid quench.4.1.1.2 Precipitation harden at 1420 6 15F 770 6 8Cfor 16 h a
9、t temperature air cool; 1200 6 15F 650 6 8C for16 h at temperature air cool.4.1.2 Type 2:4.1.2.1 Solution anneal at 1800 6 25F 980 6 14C for 2to5hattemperature liquid quench.4.1.2.2 Precipitation harden at 1420 6 15F 770 6 8Cfor 16 h at temperature air cool; 1200 6 15F 650 6 8C for16 h at temperatur
10、e air cool.5. Manufacture5.1 The material shall be made by vacuum melting followedby consumable electrode vacuum arc or electroslag remeltingas agreed upon between producer and user.5.2 The forgings shall be upset forged so that the axis of thedisk corresponds with that of the ingot.6. Chemical Requ
11、irements6.1 Heat AnalysisEach heat shall be analyzed by themanufacturer in accordance with Specification A 788/A 788M.The chemical composition shall conform to the requirementsspecified in Table 1.6.2 Product AnalysisThe purchaser may obtain a productanalysis, representing each heat or multiple heat
12、, in accordancewith the provisions of Specification A 788/A 788M.1This specification is under the jurisdiction of Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved March 1, 2008. Pub
13、lished March 2008. Originallyapproved in 1988. Last previous edition approved in 2007 as A 891/A 891M 07.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standar
14、ds Document Summary page onthe ASTM website.1*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.7. Mechanical Properties7.1 The forgings shall conform to the mechanical pr
15、opertyrequirements specified in Table 2 after heat treatment asprescribed in 4.1.7.2 Tension and HardnessTension and hardness testingshall be conducted in accordance with Specification A 788/A 788M.7.3 Stress Rupture:7.3.1 Combination smooth and notched bar specimens using0.252 in. 6.4 mm diameter b
16、ars shall be tested to rupture inaccordance with Test Methods E 292. Rupture must occur inthe smooth section of each specimen.After 100 h, samples maybe uploaded in 5-ksi 35-MPa increments in 8 to 16 hintervals.7.3.2 Material supplied as Type 1 shall meet the stressrupture requirements specified in
17、Table 3.7.3.3 Material supplied as Type 2 shall meet the stressrupture requirements of either Test A or Test B of Table 3 asspecified by the purchaser.7.4 Creep:7.4.1 A creep test shall be performed in accordance withTest Methods E 139 on a 0.252 in. 6.4 mm diameter smoothbar.7.4.2 The material shal
18、l meet the requirements specified inTable 4 after heat treatment as prescribed in 4.1.7.5 Number of TestsThe testing frequency shall be asfollows with a lot being defined as not more than 50 pieces ofthe same part made from the same heat of material to the sameforging parameters, forged within an 8
19、h period, and heattreated together:7.5.1 For forgings weighing less than 500 lb 225 kg each,one tension, stress rupture, and creep test shall be made on oneforging per lot. In addition, two hardness tests shall be made oneach piece in the lot.7.5.2 For forgings weighing 500 to 2000 lb 225 to 900 kgo
20、ne tension, stress rupture, and creep test, and two hardnesstests shall be made on each forging.7.5.3 For forgings weighing over 2000 lb 900 kg testingshall be performed as covered in Supplementary RequirementS1. In addition, one tangential tension, stress rupture, and creeptest shall be run on mate
21、rial taken from the forging hub.7.6 Test Location:7.6.1 The tension, stress rupture, and creep specimenscovered in 7.5.1 and 7.5.2 shall be machined from tangentialbars taken from the forging rim.7.6.2 Hardness tests shall be taken on both the rim and hub.8. Microstructure8.1 The forgings shall have
22、 an average grain size of number4 or finer as determined in accordance with Test MethodsE112. The material shall be of a uniform microstructure, freeof phase or compound formations such as a continuous grainboundary film.8.2 One test per lot is required for forgings weighing lessthan 500 lb 225 kg e
23、ach. One test per forging is required onall other forgings.8.3 The microstructural examination may be performed onmaterial taken from the non-deformed grip section of aperipheral tensile test specimen or on a separate sample takenfrom the peripheral area of a forging.9. Non-Destructive Examinations9
24、.1 Ultrasonic Examination:9.1.1 Each forging shall be subjected to ultrasonic exami-nation.9.1.2 The method of ultrasonic examination and acceptancelevel shall be agreed upon between the purchaser and manu-facturer.9.2 Liquid Penetrant ExaminationEach forging shall besubjected to liquid penetrant ex
25、amination using one of themethods outlined in Test Method E 165. The specific testprocedure and acceptance level shall be as agreed upon by thepurchaser and manufacturer.10. Quality10.1 The forgings shall be uniform in quality and condition,clean, sound, and free of cracks, seams, laps, shrinkage, a
26、ndother injurious imperfections.TABLE 1 Chemical CompositionElement Heat Analysis Range,PercentageCarbon 0.05 maxManganese 0.50 maxSilicon 0.50 maxPhosphorus 0.025 maxSulfur 0.015 maxChromium 13.5016.00Nickel 24.0027.00Molybdenum 1.001.50Titanium 1.902.35Boron 0.0030.010Vanadium 0.100.50Aluminum 0.3
27、5 maxIron remainderTABLE 2 Mechanical Property RequirementsType 1 Type 2Tensile Strength, min, ksi MPa 140 965 130 8950.2 % Offset Yield Strength, min,ksi MPa95 655 85 585Elongation in 2 in. or 4D, min, % 12 15Reduction of Area, min, % 15 20Hardness, HB 277363 248341TABLE 3 Stress Rupture Requiremen
28、tsTest Temp,F CStress,ksi MPaMin, h Min,Elongation in4D, %Type 1 1200 650 56 385 100 15Type 2Test A 1200 650 56 385 100 8Test B 1200 650 65 450 30 10TABLE 4 Creep RequirementsTemperature,F CStress,ksi MPaTime, h Creep Strain, %1000 538 85 585 100 0.12.0A 891/A 891M 08211. Certification and Reports11
29、.1 Certifications shall be furnished in accordance withSpecification A 788/A 788M.11.2 The report shall include the results of the chemicalanalysis(ses), microstructural examination, the date, drawingnumber, melt practice used, ingot number and position or serialnumber and the name of the manufactur
30、er. It shall also includethe test parameters and results of the tensile, creep, stress-rupture, and hardness testing as well as the ultrasonic andliquid penetrant examination results.12. Product Marking12.1 Each forging shall be legibly stamped by the manufac-turer in accordance with Specification A
31、 788/A 788M. Mark-ings shall include the ingot number and position or serialnumber, part number, and purchase order number.13. Keywords13.1 age hardened; alloy steelturbine disk; alloy steelturbine wheel; creep; elevated temperature service; forging;precipitation hardened; stress rupture; superalloy
32、SUPPLEMENTARY REQUIREMENTSThe following supplemental requirements shall apply only when specified by the purchaser on theorder and agreed to by the manufacturer.S1. Number of TestsS1.1 Two tension and stress rupture tests shall be made oneach forging weighing less than 2000 lb 900 kg. Each set oftes
33、ts shall be machined from tangential bars located 180 aparton the forging rim.S1.2 One creep test shall be made on each forging weighingless than 2000 lb 900 kg. Test material shall be taken from thesame location as that for one of the sets of test bars covered inS1.1.S1.3 One microstructural examin
34、ation shall be performedon each forging in accordance with 8.1.S1.4 A product analysis of each forging shall be made bythe manufacturer in accordance with Specification A 788/A 788M and shall conform to the requirements of Table 1.S2. Stress RuptureS2.1 The stress rupture tests conditions shall be 1
35、200F650C, 65 ksi 450 MPa, 30 h minimum, no upload, with a15 % minimum elongation.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A 891/A 891M 07) that may impact the use of this standard. (Approved March 1, 2008.)(1) Deleted headi
36、ng reference to product analysis in Table 1.(2) Added 6.2 on product analysis.Committee A01 has identified the location of selected changes to this standard since the last issue (A 891 98(2003) that may impact the use of this standard. (Approved May 1, 2007.)(1) Changed from single to dual units sta
37、ndard.(2) Added 3.1.4.(3) Revised Section 4 header.(4) Deleted sections on heat treatment and retests.(5) Revised Table 1.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expre
38、ssly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised
39、, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may a
40、ttend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).A 891/A 891M 083
