1、Designation: A982/A982M 05 (Reapproved 2010)Standard Specification forSteel Forgings, Stainless, for Compressor and TurbineAirfoils1This standard is issued under the fixed designation A982/A982M; the number immediately following the designation indicates the yearof original adoption or, in the case
2、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. Scope1.1 This specification covers stainless steel forgings forcompressor and turbine bucket, blade, a
3、nd airfoil applications.1.2 This specification is expressed in both inch-pound unitsand in SI units; however, unless the purchase order or contractspecifies the applicable M designation (SI units), the inch-pound units shall apply. The values stated in either inch-poundunits or SI units are to be re
4、garded separately as standard.Within the text, the SI units are shown in brackets. The valuesstated in each system may not be exact equivalents; therefore,each system shall be used independently of the other. Combin-ing values from the two systems may result in nonconformancewith the standard.2. Ref
5、erenced Documents2.1 ASTM Standards:2A275/A275M Practice for Magnetic Particle Examinationof Steel ForgingsA788/A788M Specification for Steel Forgings, General Re-quirementsE381 Method of Macroetch Testing Steel Bars, Billets,Blooms, and ForgingsE562 Test Method for Determining Volume Fraction bySys
6、tematic Manual Point Count3. Ordering Information3.1 In addition to the ordering information required bySpecification A788/A788M, the purchaser shall include asketch or written description of the forging with the inquiry andorder.4. General Requirements4.1 Materials supplied to this specification sh
7、all conform tothe requirements of Specification A788/A788M, which out-lines additional ordering information, manufacturing require-ments, testing and retesting methods and procedures, marking,certification, product analysis variations and additional supple-mentary requirements.4.2 If the requirement
8、s of this specification are in conflictwith the requirements of Specification A788/A788M, therequirements of this specification shall prevail.5. Manufacture5.1 Melting ProcessAll melting processes of Specifica-tion A788/A788M are permitted unless Supplementary Re-quirement S1 is invoked by the purch
9、aser.5.2 Forging ProcessEither the closed impression die orthe open die forging processes may be utilized unless thepurchaser specifies one or the other.5.2.1 Forging TemperatureThe maximum part tempera-ture during forging shall be 2150F 1175C.5.3 Heat TreatmentHeat treating all forgings is required
10、in accordance with Table 1 to develop the required mechanicalproperties.5.3.1 Number of Heat TreatmentsTwo complete heattreatments, consisting of an austenitize, quench, and temper,are permitted. Purchaser approval is required prior to anyadditional heat treatments.5.3.2 Temperature VariationHeat tr
11、eating temperaturesshall be controlled in the range of 625F 614C.5.4 Stress ReliefWhen heat treatment for mechanicalproperties is followed by straightening, a stress-relieving heattreatment is required at a temperature meeting the requirementsof Table 1.5.4.1 Quenching after Stress ReliefWater or oi
12、l quenchingof stress-relieved forgings is prohibited.6. Chemical Composition6.1 The steel shall conform to the requirements for chemicalcomposition prescribed in Table 2.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct
13、responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved April 1, 2010. Published May 2010. Originallypublished in 1998. Last previous edition approved in 2005 as A982/A982M 05.DOI: 10.1520/A0982_A0982M-05R10.2For referenced ASTM standards, visit the ASTM website,
14、www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.
15、 Mechanical Properties7.1 Tension, Impact, and Hardness TestsAll testing shallbe performed after heat treatment and stress relief, as appli-cable. The test specimens shall meet the requirements of Table3.7.1.1 Number of TestsA minimum of two forgings fromeach lot shall be randomly selected for longi
16、tudinal tensile,impact, and hardness testing. Hardness values of the tensiontest specimen shall be reported with the tensile data.7.1.1.1 Lot SizeA lot shall consist of all forgings of thesame size from one electric furnace heat of steel and heattreated either in the same charge in either a batch fu
17、rnace or acontinuous type furnace.7.1.1.2 Continuous Heat Treating FurnacesTest forgingsshall be taken from each of the first and last push or tray to exitthe furnace. Additional forgings shall be taken so that themaximum time between samples is 4 h.7.1.1.3 Test LocationsOne tension test specimen an
18、d oneset of three impact test specimens shall be machined from thecenter portion of the air foil vane section.TABLE 1 Heat Treatment, F CGrade A Grade B Grade C Grade D Grade E Grade FClasses1 stainless steel forgings; turbineairfoilsSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements
19、 shall apply only when specified by the purchaser in theinquiry, contract, and order. Details of these supplementary requirements shall be agreed upon by themanufacturer and purchaser.S1. Secondary Melting and RefiningS1.1 ESR or VAR is required. Use of either is permittedunless otherwise specified.
20、S2. Ingot Chemical AnalysisS2.1 If consumable electrode remelting is used, then chemi-cal analyses of each remelted ingot shall meet the chemicalcomposition requirements listed and shall be reported.S3. MacrostructureS3.1 Samples shall be taken from the top and bottom of thefirst and last ingot of e
21、ach heat. The structure of the startingbillets shall meet the criteria of Method E381, S-3, R-2, C-3#36 in.2230 cm2 and S-3, R-3, C-3 36 in.2230 cm2.S4. Root Attachment Zone Mechanical PropertiesS4.1 Testing for mechanical properties of the root attach-ment area is required. The type, number, locati
22、on, and orien-tation of the tests shall be specified by the purchaser.S5. Magnetic Particle InspectionS5.1 Each forging shall be magnetic particle inspected inaccordance with Test Method A275/A275M. The maximumacceptable indication size shall be18 in. 3 mm unlessotherwise specified by the purchaser.
23、S6. Ultrasonic InspectionS6.1 Ultrasonic inspection is required. The test method,location, and acceptance criteria shall be as agreed upon by thepurchaser and producer.S7. MicrostructureS7.1 The microstructure shall be uniformly fine grain tem-pered martensite with no more than 1 % delta ferrite.S7.
24、2 Metallographic inspection shall be performed at 100xmagnification to determine the metallurgical structure, grainsize, decarburization, and delta ferrite content. Visual estima-tion for the volume fraction of delta ferrite of various repre-sentative areas of examination is acceptable. When the vis
25、ualestimation method indicates the delta ferrite content is greaterthan the allowed limit, the manufacturer may employ TestMethod E562 for determining the acceptability of a lot.S7.3 A specimen shall be removed from the airfoil sectionon one test forging per heat treat lot. The plane of polish of th
26、especimen shall be parallel to the axial centerline of the forging.The area examined shall include both the concave and convexvane surfaces.A982/A982M 05 (2010)3S7.4 Surface decarburization of forgings shall not exceed0.06 in. 1.5 mm.S8 Hardness TestingS8.1 One hardness test is required on the surfa
27、ce of theturbine rotor attachment portion on each forging. When speci-fied by the purchaser, forgings shall be hardness tested forsurface hardness on the air foil vane section.S9. Minimum Hardness RequirementsS9.1 When agreed upon by the purchaser and producer, aminimum hardness value is required.AS
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29、ntirely 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, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards
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31、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A982/A982M 05 (2010)4
