ASTM_A_891_-_A_891M_-_16.pdf

Designation:A891/A891M16Standard 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 yearof 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*1.1 This specification covers precipitation hardening ironbase superalloy forgings 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 A788/A788M,apply,except as amended 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-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2A788/A788M Specification for Steel Forgings,General Re-quirementsE112 Test Methods for Determining Average Grain SizeE139 Test Methods for Conducting Creep,Creep-Rupture,and Stress-Rupture Tests of Metallic MaterialsE165/E165M Practice for Liquid Penetrant Examination forGeneral IndustryE292 Test Methods for Conducting Time-for-Rupture NotchTension 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-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 SpecificationA788/A788M.4.Condition 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 2to 5 h at temperature liquid quench.4.1.1.2 Precipitation harden at 1420 6 15F 770 6 8Cfor 16 h at temperature air cool;1200 6 15F 650 6 8C for16 h at temperature air cool.4.1.2 Type 2:4.1.2.1 Solution anneal at 1800 6 25F 980 6 14C for 2to 5 h at temperature 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 temperature 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 Requirements6.1 Heat AnalysisEach heat shall be analyzed by themanufacturer in accordance with Specification A788/A788M.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,in accordancewith the provisions of Specification A788/A788M.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 May 1,2016.Published May 2016.Originallyapproved in 1988.Last previous edition approved in 2015 as A891/A891M 10(2015).DOI:10.1520/A0891_A0891M-16.2For 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 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 States1 7.Mechanical Properties7.1 The forgings shall conform to the mechanical propertyrequirements 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 A788/A788M.7.3 Stress Rupture:7.3.1 Combination smooth and notched bar specimens using0.252 in.6.4 mm diameter bars shall be tested to rupture inaccordance with Test Methods E292.Rupture must occur in thesmooth 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 stressrupture requirements specified in 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 accor