ASTM_A_327_-_A_327M_-_11.pdf

Designation:A327/A327M11Standard Test Methods forImpact Testing of Cast Irons1This standard is issued under the fixed designation A327/A327M;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.Scope1.1 These test methods for impact testing cover the detailsof apparatus,test specimens and procedures for cast iron,including gray iron,white iron,malleable iron,ductile iron,and austempered ductile iron,but not including chilled rolls orrolls with white iron skins.1.2 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.3 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:2A327M Test Methods for Impact Testing of Cast Irons(Metric)E23 Test Methods for Notched Bar Impact Testing of Me-tallic MaterialsTEST METHOD AROUND BAR CHARPY-TYPEIMPACT TEST FOR GRAY AND WHITE IRONS3.Scope3.1 The Charpy-type impact test shall be employed fortesting gray and white irons.4.Apparatus4.1 The single-blow Charpy impact test for gray and whiteirons shall be carried out in a pendulum-type impact machinewith a capacity of at least 150 J 110 ft lbf as used for thesimple beam test for steel described in Test Methods E23.5.Test Specimens5.1 The test specimens shall have a plain cylindrical form,machined or ground to a smooth finish and shall conform to thefollowing dimensions:Type AType MDiameter28.572 0.050 mm1.125 0.002 in.20.00 0.03 mm0.787 0.001 in.Length200 13 mm8.0 0.5 in.120 2 mm4.73 0.08 in.Span152.0 0.7 mm6.00 0.03 in.100.0 0.5 mm3.937 0.020 in.6.Procedure6.1 Test the bars on the spans indicated in the tabular data of5.1.In all other respects,the test shall conform to theappropriate requirements of Test Methods E23.6.2 Make the test at room temperature.6.3 Characterization of the fracture toughness of any castiron should be based upon testing at least three specimens.NOTE1Care should be taken to examine broken specimens forindication of anvil interference which will give erroneous results.7.Report7.1 The results shall be reported as _J ft lbf cast ironCharpy impact with _ mm in.diameter bar.TEST METHOD BSTANDARD CHARPY-TYPEIMPACT TEST FOR MALLEABLE AND DUCTILEIRONS8.Scope8.1 Either the standard notched or unnotched Charpy impacttest shall be employed in testing of malleable or ductile irons.Selection of the type bar is dependent upon the specificmaterial to be evaluated as defined in Section 9.8.2 Both types of charpy bars have been designated tocharacterize the fracture toughness of irons.The unnotchedCharpy bar,when tested,will produce substantially higherenergy values than the notch bar type.The unnotched bar istherefore specified for testing irons that have low fracturetoughness characteristics.1These test methods are under the jurisdiction ofASTM Committee A04 on IronCastings and are the direct responsibility of Subcommittee A04.21 on Testing.Current edition approved Oct.15,2011.Published December 2011.Originallyapproved in 1950.Last previous edition approved in 2006 as A327 91(2006).DOI:10.1520/A0327_A0327M-11.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 9.Charpy Test Bar Type9.1 Unless specified otherwise,the notched bar type speci-mens in Fig.1 or Fig.2(for pipe type products)shall beemployed.Exceptions are defined in 9.2 and 9.3.9.2 The unnotched charpy type specimen in Fig.3 shall beemployed for testing of all grades of austempered ductile iron.These irons are tested after the austempering heat treatment.9.3 The unnotched charpy test specimen may be specifiedfor other types of irons or irons that have been heat treated invarious ways other than austempering,by specific agreementbetween producer and purchaser.10.Apparatus10.1 The single-blow Charpy test for ductile and malleableiron shall be carried out in a pendulum-type impact machinewith a capacity of at least 150 J 110 ft lbf as used for thesimple beam test for steel described in Test Methods E23.10.2 Standard machines may be modified by using a moresensitive scale,or pendulum machines of a lower capacity maybe u