1、Designation: A982/A982M 10 (Reapproved 2015)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 Examination ofSteel ForgingsA788/A788M Specification for Steel Forgings, General Re-quirementsE112 Test Methods for Determining Average Grain SizeE292 Test Methods for Conducting Time-for-Rupture NotchTension Tests of Mat
6、erialsE381 Method of Macroetch Testing Steel Bars, Billets,Blooms, and ForgingsE562 Test Method for Determining Volume Fraction bySystematic Manual Point Count3. Ordering Information3.1 In addition to the ordering information required bySpecification A788/A788M, the purchaser shall include asketch o
7、r written description of the forging with the inquiry andorder.4. General Requirements4.1 Materials supplied to this specification shall conform tothe requirements of Specification A788/A788M, which out-lines additional ordering information, manufacturingrequirements, testing and retesting methods a
8、nd procedures,marking, certification, product analysis variations and addi-tional supplementary requirements.4.2 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M, therequirements of this specification shall prevail.5. Manufacture5.1 Melting P
9、rocessAll melting processes of SpecificationA788/A788M are permitted unless Supplementary Require-ment S1 is invoked by the purchaser.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 Temp
10、eratureThe maximum part tempera-ture during forging shall be 2150F 1175C.5.3 Heat TreatmentHeat treating all forgings is required inaccordance with Table 1 to develop the required mechanicalproperties.5.3.1 Number of Heat TreatmentsTwo complete heattreatments, consisting of an austenitize, quench, a
11、nd temper,are permitted. Purchaser approval is required prior to anyadditional heat treatments.5.3.2 Temperature VariationHeat treating temperaturesshall be controlled in the range of 625F 614C.5.4 Stress ReliefWhen heat treatment for mechanicalproperties is followed by straightening, a stress-relie
12、ving heattreatment is required at a temperature meeting the requirementsof Table 1.5.4.1 Quenching after Stress ReliefWater or oil quenchingof stress-relieved forgings is prohibited.6. Chemical Composition6.1 The steel shall conform to the requirements for chemicalcomposition prescribed in Table 2.1
13、This specification is under the jurisdiction of ASTM 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, 2015. Published March 2015. Originallypublished in 1998. Last previous
14、 edition approved in 2010 as A982/A982M 10.DOI: 10.1520/A0982_A0982M-10R15.2For 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 standards Document Summary page onthe
15、 ASTM website.*A 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 States17. Mechanical Properties7.1 Tension, Impact, and Hardness TestsAll testing shallbe performed after heat tre
16、atment 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 longitudinal tensile,impact, and hardness testing. Hardness values of the tensiontest specimen shall be report
17、ed 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 furnace or acontinuous type furnace.7.1.1.2 Continuous Heat Treating FurnacesTest forgingsshall be taken fr
18、om 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 and oneset of three impact test specimens shall be machined from thecenter portion of the air foil vane sec
19、tion.7.1.2 Forging Hardness Testing:7.1.2.1 Batch Type FurnacesA minimum of 10 % of theforgings in each lot shall be hardness tested.7.1.2.2 Continuous Type FurnacesSamples for hardnesstesting shall be taken from every other tray or push.TABLE 1 Heat Treatment, F CGrade A Grade B Grade C Grade D Gra
20、de E Grade FClasses1 stainless steel forgings; turbineairfoilsSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the purchaser in theinquiry, contract, and order. Details of these supplementary requirements shall be agreed upon by themanufacturer an
21、d purchaser.S1. Secondary Melting and RefiningS1.1 ESR or VAR is required. Use of either is permittedunless otherwise specified.S2. Ingot Chemical AnalysisS2.1 If consumable electrode remelting is used, then chemi-cal analyses of each remelted ingot shall meet the chemicalcomposition requirements li
22、sted and shall be reported.S3. MacrostructureS3.1 Samples shall be taken from the top and bottom of thefirst and last ingot of each 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 Zon
23、e Mechanical PropertiesS4.1 Testing for mechanical properties of the root attach-ment area is required. The type, number, location, 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 wi
24、th Practice A275/A275M. The maximum accept-able indication size shall be18 in. 3 mm unless otherwisespecified by the purchaser.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. M
25、icrostructureS7.1 The microstructure shall be uniformly fine grain tem-pered martensite with no more than 1 % delta ferrite.S7.2 Metallographic inspection shall be performed at 100xmagnification to determine the metallurgical structure, grainsize, decarburization, and delta ferrite content. Visual e
26、stima-tion for the volume fraction of delta ferrite of various repre-sentative areas of examination is acceptable. When the visualestimation method indicates the delta ferrite content is greaterthan the allowed limit, the manufacturer may employ TestMethod E562 for determining the acceptability of a
27、 lot.S7.3 A specimen shall be removed from the airfoil sectionon one test forging per heat treat lot. The plane of polish of thespecimen shall be parallel to the axial centerline of the forging.The area examined shall include both the concave and convexvane surfaces.S7.4 Surface decarburization of f
28、orgings shall not exceed0.06 in. 1.5 mm.S8 Hardness TestingS8.1 One hardness test is required on the surface 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 Hardne
29、ss RequirementsS9.1 When agreed upon by the purchaser and producer, aminimum hardness value is required.A982/A982M 10 (2015)3S10. Stress Rupture Testing Grade DS10.1 Stress rupture testing shall be conducted at 1200F650C and 26 000 psi 180 MPa using a combination test barin accordance with Test Meth
30、ods E292. Rupture shall occur inthe smooth section of each test specimen. The test may bediscontinued after 25 h provided the certification so notes.Stress rupture testing is not required on bars less than12 in. indiameter or thickness.S11. Grain Size Grade DS11.1 The average grain size shall be 4 o
31、r finer. Themaximum size of individual grains, distributed at random, shallbe a 2. When the average grain size is 5 or finer, only theaverage size need be reported. Grain size determination shallbe performed in accordance with Test Methods E112.ASTM International takes no position respecting the val
32、idity 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 infringement of such rights, are entirely their own responsibility.This standard is sub
33、ject 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 standardsand should be addressed to ASTM International Headqua
34、rters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. 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 standa
35、rd 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 10 (2015)4
