1、Designation: A891/A891M 10 (Reapproved 2015)A891/A891M 16Standard Specification forPrecipitation Hardening Iron Base Superalloy Forgings forTurbine Rotor Disks and Wheels1This standard is issued under the fixed designation A891/A891M; the number immediately following the designation indicates the ye
2、arof 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 Scope*1.1 This specification covers precipitation hardeni
3、ng iron base superalloy forgings which are primarily intended for use asturbine rotor disks and wheels.1.2 Two heat treatments are covered. Selection will depend upon design, service conditions, mechanical properties, and elevatedtemperature characteristics.1.3 All of the provisions of Specification
4、 A788/A788M, 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 eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from th
5、etwo systems may result in non-conformance with the standard.2. Referenced Documents2.1 ASTM Standards:2A788/A788M Specification for Steel Forgings, General RequirementsE112 Test Methods for Determining Average Grain SizeE139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests
6、 of Metallic MaterialsE165/E165M Practice for Liquid Penetrant Examination for General IndustryE292 Test Methods for Conducting Time-for-Rupture Notch Tension Tests of Materials3. Ordering Information3.1 Orders for material under this specification shall include the following:3.1.1 ConditionSee Sect
7、ion 4.3.1.2 Stress Rupture TestParameters for material furnished in condition 2 of 7.3.3.3.1.3 Forging DrawingEach forging shall be manufactured in accordance with a drawing furnished by the purchaser showingthe dimensions of the forging and the location of mechanical test specimens.3.1.4 Include th
8、e information specified in Specification A788/A788M.4. Condition and Heat Treatment4.1 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 25F 900 6 14C for 2 to 5 h at temperature liquid quenc
9、h.4.1.1.2 Precipitation harden at 1420 6 15F 770 6 8C for 16 h at temperature air cool; 1200 6 15F 650 6 8C for 16h at temperature air cool.4.1.2 Type 2:4.1.2.1 Solution anneal at 1800 6 25F 980 6 14C for 2 to 5 h at temperature liquid quench.4.1.2.2 Precipitation harden at 1420 6 15F 770 6 8C for 1
10、6 h at temperature air cool; 1200 6 15F 650 6 8C for 16h at temperature air cool.1 This specification is under the jurisdiction of Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.06 onSteel Forgings and Billets.Current edition approved
11、March 1, 2015May 1, 2016. Published March 2015May 2016. Originally approved in 1988. Last previous edition approved in 20102015 asA891/A891M 10.A891/A891M 10(2015). DOI: 10.1520/A0891_A0891M-10R15.10.1520/A0891_A0891M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contact
12、ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.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 m
13、ade to the previous version. Becauseit 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 versionof the standard as published by ASTM is to be considered the official document.*A
14、 Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15. Manufacture5.1 The material shall be made by vacuum melting followed by consumable electrode vacuum arc or electroslag r
15、emelting asagreed 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 Requirements6.1 Heat AnalysisEach heat shall be analyzed by the manufacturer in accordance with Specification A788/A788M. Thechemical co
16、mposition shall conform to the requirements specified in Table 1.6.2 Product AnalysisThe purchaser may obtain a product analysis, representing each heat or multiple heat, in accordance withthe provisions of Specification A788/A788M.7. Mechanical Properties7.1 The forgings shall conform to the mechan
17、ical property requirements specified in Table 2 after heat treatment as prescribedin 4.1.7.2 Tension and HardnessTension and hardness testing shall be conducted in accordance with Specification A788/A788M.7.3 Stress Rupture:7.3.1 Combination smooth and notched bar specimens using 0.252 in. 6.4 mm di
18、ameter bars shall be tested to rupture inaccordance with Test Methods E292. Rupture must occur in the smooth section of each specimen. After 100 h, samples may beuploaded in 5-ksi 35-MPa increments in 8 to 16 h intervals.7.3.2 Material supplied as Type 1 shall meet the stress rupture requirements sp
19、ecified in Table 3.7.3.3 Material supplied as Type 2 shall meet the stress rupture requirements of either Test A or Test B of Table 3 as specifiedby the purchaser.7.4 Creep:7.4.1 A creep test shall be performed in accordance with Test Methods E139 on a 0.252 in. 6.4 mm diameter smooth bar.7.4.2 The
20、material shall meet the requirements specified in Table 4 after heat treatment as prescribed in 4.1.7.5 Number of TestsThe testing frequency shall be as follows with a lot being defined as not more than 50 pieces of the samepart made from the same heat of material to the same forging parameters, for
21、ged within an 8 h period, and heat treated 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 on each piece in the lot.7.5.2 For forgings weighing 500 to 200
22、0 lb 225 to 900 kg one tension, stress rupture, and creep test, and two hardness testsshall be made on each forging.7.5.3 For forgings weighing over 2000 lb 900 kg testing shall be performed as covered in Supplementary Requirement S1.In addition, one tangential tension, stress rupture, and creep tes
23、t shall be run on material taken from the forging hub.7.6 Test Location:7.6.1 The tension, stress rupture, and creep specimens covered in 7.5.1 and 7.5.2 shall be machined from tangential bars takenfrom the forging rim.7.6.2 Hardness tests shall be taken on both the rim and hub.8. Microstructure8.1
24、The forgings shall have an average grain size of number 4 or finer as determined in accordance with Test Methods E112.The material shall be of a uniform microstructure, free of phase or compound formations such as a continuous grain boundary film.TABLE 1 Chemical CompositionElement Heat Analysis Ran
25、ge,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 0.35 maxIron remainderA891/A891M 1628.2 One test per lot is required for forgings weighi
26、ng less than 500 lb 225 kg each. One test per forging is required on all otherforgings.8.3 The microstructural examination may be performed on material taken from the non-deformed grip section of a peripheraltensile test specimen or on a separate sample taken from the peripheral area of a forging.9.
27、 Non-Destructive Examinations9.1 Ultrasonic Examination:9.1.1 Each forging shall be subjected to ultrasonic examination.9.1.2 The method of ultrasonic examination and acceptance level shall be agreed upon between the purchaser and manufacturer.9.2 Liquid Penetrant ExaminationEach forging shall be su
28、bjected to liquid penetrant examination using one of the methodsoutlined in Practice E165/E165M. The specific test procedure and acceptance level shall be as agreed upon by the purchaser andmanufacturer.10. Quality10.1 The forgings shall be uniform in quality and condition, clean, sound, and free of
29、 cracks, seams, laps, shrinkage, and otherinjurious imperfections.11. Certification and Reports11.1 Certifications shall be furnished in accordance with Specification A788/A788M.11.2 The report shall include the results of the chemical analysis(ses), microstructural examination, the date, drawing nu
30、mber,melt practice used, ingot number and position or serial number and the name of the manufacturer. It shall also include the testparameters and results of the tensile, creep, stress-rupture, and hardness testing as well as the ultrasonic and liquid penetrantexamination results.12. Product Marking
31、12.1 Each forging shall be legibly stamped by the manufacturer in accordance with Specification A788/A788M. Markings shallinclude the ingot number and position or serial number, part number, and purchase order number.13. Keywords13.1 age hardened; alloy steelturbine disk; alloy steelturbine wheel; c
32、reep; elevated temperature service; forging;precipitation hardened; stress rupture; superalloyTABLE 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 Ar
33、ea, min, % 15 20Hardness, HB 277363 248341TABLE 3 Stress Rupture RequirementsTest 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,
34、 %1000 538 85 585 100 0.12.0A891/A891M 163SUPPLEMENTARY 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 on each forging weighi
35、ng lessmore than 2000 lb 900 kg. Each set oftests shall be machined from tangential bars located 180 apart on the forging rim.S1.2 One creep test shall be made on each forging weighing lessmore than 2000 lb 900 kg. Test material shall be taken fromthe same location as that for one of the sets of tes
36、t bars covered in S1.1.S1.3 One microstructural examination shall be performed on each forging in accordance with 8.1.S1.4 A product analysis of each forging shall be made by the manufacturer in accordance with Specification A788/A788M andshall conform to the requirements of Table 1.S2. Stress Ruptu
37、reS2.1 The stress rupture tests conditions shall be 1200F 650C, 65 ksi 450 MPa, 30 h minimum, no upload, with a 15 %minimum elongation.S3. Heat Analysis for Each Remelted IngotS3.1 A heat analysis of each remelt ingot shall be performed by the manufacturer in accordance with S27 of SpecificationA788
38、/A788M. The results shall conform to the requirements specified in Table 1 of A891/A891M.SUMMARY OF CHANGESCommitteeA01 has identified the location of the following change to this standard sinceA668/A668M-15 thatmay impact the use of this standard. (Approved May 1, 2016.)(1) Revised Supplementary Re
39、quirement S1 to agree with 7.5.3.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 expressly advised that determination of the validity of any such patent rights, and the riskof
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