ASTM_B_851_-_04_2014.pdf

Designation:B85104(Reapproved 2014)Standard Specification forAutomated Controlled Shot Peening of Metallic ArticlesPrior to Nickel,Autocatalytic Nickel,or Chromium Plating,or as Final Finish1This standard is issued under the fixed designation B851;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 Thisspecificationcoverstherequirementsforautomated,controlled shot peening of metallic articles prior toelectrolytic or autocatalytic deposition of nickel or chromium,or as a final finish,using shot made of cast steel,conditionedcut wire,or ceramic media.The process is applicable to thosematerials on which test work has shown it to be beneficialwithin given intensity ranges.It is not suitable for brittlematerials.Hand peening and rotary flap peening are excludedspecifically.1.2 Shot peening induces residual compressive stresses inthe surface and near-surface layers of metallic articles,control-ling or limiting the reduction in fatigue properties that occursfrom nickel or chromium plating of the article,or the fatigueproperties of unplated articles.1.3 The values stated in SI units are to be regarded asstandard.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:2B183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Preparation of High-Carbon Steel for Elec-troplatingB320 Practice for Preparation of Iron Castings for Electro-platingB322 Guide for Cleaning Metals Prior to ElectroplatingB607 Specification for Autocatalytic Nickel Boron Coatingsfor Engineering UseB650 Specification for Electrodeposited Engineering Chro-mium Coatings on Ferrous SubstratesB656 GuideforAutocatalytic(Electroless)Nickel-Phosphorus Deposition on Metals for Engineering Use(Discontinued 2000)(Withdrawn 2000)3B689 Specification for Electroplated Engineering NickelCoatingsB733 Specification for Autocatalytic(Electroless)Nickel-Phosphorus Coatings on MetalE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE165 Practice for Liquid Penetrant Examination for GeneralIndustryE709 Guide for Magnetic Particle Testing2.2 Federal Standards:4QQ-N-290 Nickel Plating(Electrodeposited)QQ-C-320Chromium Plating(Electrodeposited)2.3 Military Standards:4MIL-S-851 Steel Grit,Shot,and Cut Wire Shot,and IronGrit and Shot Blast Cleaning and PeeningMIL-S-13165 Shot Peening of Metal PartsMIL-C-26074 Coating,Electroless NickelMIL-STD-45662 Calibration System Requirements2.4 SAE Standards:5SAE J441 Cut Steel Wire ShotSAE J442 Test Strip,Holder and Gage for Shot PeeningSEA J827 Cast Steel ShotSAE J1830 Size,Classification and Characteristics of Ce-ramic Shot for Peening1This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.02 on Pre Treatment.Current edition approved Nov.1,2014.Published November 2014.Originallyapproved in 1994.Discontinued January 2004 and reinstated in 2004 as B85104.Last previous edition approved in 2009 as B85109.DOI:10.1520/B0851-04R14.2For 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.4Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.5Available from Society of Automotive Engineers,400 Commonwealth Drive,Warrendale,PA 15096.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Terminology3.1 Definitions:3.1.1 Almen stripUNS G10700 carbon steel specimensthat are used to calibrate the energy of a shot peening stream(see Fig.1).3.1.2 Almen strip holding fixturea fixture for holdingAlmen strips in suitable locations that represent the positionand angular orientation of the surfaces of a part where intensityis to be determined and verified(see Fig.2).3.1.3 arc heightflat Almen strips,when subjected to astream of shot moving at an adequate velocity,bending in anarc corresponding to the amount of energy transmitted by theshot stream.The height of the curved arc measured inmillimeters is the arc height,measured by an Almen gage(seeFig.3).3.1.4 automatic equipmentshot peening equipment inwhich parts,fixtures,nozzles,and peening parameters arepreset by hand o