ASTM_B_988_-_13.pdf

Designation:B98813Standard Specification forPowder Metallurgy(PM)Titanium and Titanium AlloyStructural Components1This standard is issued under the fixed designation B988;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers powder metallurgy(PM)struc-tural components fabricated from:1.1.1 Commercially pure(CP)(that is,unalloyed)titaniumpowder,1.1.2 Pre-alloyed powders.1.1.3 Mixtures of elemental powders or mixtures of elemen-tal powders and pre-alloyed powders.1.2 This specification covers:1.2.1 Grade 1 PMUnalloyed titanium,1.2.2 Grade 2 PMUnalloyed titanium,1.2.3 Grade 3 PMUnalloyed titanium,1.2.4 Grade 4 PMUnalloyed titanium,1.2.5 Grade 5 PMTitanium alloy(6%aluminum,4%vanadium),1.2.6 Grade 9 PMTitanium alloy(3%aluminum,2.5%vanadium),1.2.7 Ti-6Al-4V PM Low Interstitial(LI),1.2.8 Ti-6Al-6V-2Sn PM.1.3 The values stated in SI units are to be regarded as thestandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B243 Terminology of Powder MetallurgyB311 Test Method for Density of Powder Metallurgy(PM)Materials Containing Less Than Two Percent PorosityB348 Specification for Titanium and Titanium Alloy Barsand BilletsB923 Test Method for Metal Powder Skeletal Density byHelium or Nitrogen PycnometryB962 Test Methods for Density of Compacted or SinteredPowder Metallurgy(PM)Products Using ArchimedesPrincipleE8/E8M Test Methods for Tension Testing of Metallic Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE539 Test Method forAnalysis of TitaniumAlloys by X-RayFluorescence SpectrometryE1409 Test Method for Determination of Oxygen and Nitro-gen in Titanium and Titanium Alloys by the Inert GasFusion TechniqueE1447 Test Method for Determination of Hydrogen in Tita-nium and Titanium Alloys by Inert Gas Fusion ThermalConductivity/Infrared Detection MethodE1941 Test Method for Determination of Carbon in Refrac-tory and Reactive Metals and TheirAlloys by CombustionAnalysisE2371 Test Method for Analysis of Titanium and TitaniumAlloys by Atomic Emission Plasma Spectrometry(With-drawn 2013)3E2626 Guide for Spectrometric Analysis of Reactive andRefractory Metals3.Terminology3.1 DefinitionsDefinitions of powder metallurgy termscan be found in Terminology B243.4.Ordering Information4.1 Orders for components under this specification shouldinclude the following information,or portions of it,as agreedto between purchaser and supplier:4.2 Grade or alloy composition(see Section 6 and Table 1).4.3 Mechanical properties(see Section 8 and Table 2).1This specification is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.11 on Near Full Density Powder Metallurgy Materials.Current edition approved April 1,2013.Published May 2013.DOI:10.1520/B988-13.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 Density(see 7.1).4.5 Component description(see Section 9).4.6 Processing route(see Section 5).4.7 Certification(see Section 12).4.8 SamplingSample size for determining chemical com-position will be decided by purchaser and supplier.Methodsfor chemical analysis are referenced in 10.1.1.4.9 Number of tensile tests required as mutually agreedupon by purchaser and supplier.5.Materials and Manufacture5.1 Structural components may be fabricated from powdersby processing to a near net or net shape with final machiningperformed if required.Powders may include titanium,pre-alloyed titanium alloys,master alloys,and other elementalpowders.The consolidation method shall be sufficient toachieve the final mechanical properties specified.The process-ing method may include any combination of cold compaction(for example,cold isostatic pressing,uniaxial pressing),pow-der roll compaction,hot compaction(for example,hot isostaticpressing,powder forging,and pneumatic isostatic forging),sintering,and heat treatment.6.Chemical Composition6.1 Chemical composition shall conform to the require-ments of Table 1.The purchaser may negotiate with thesup