ASTM_A_1038_-_13e1.pdf

Designation:A1038131Standard Test Method forPortable Hardness Testing by the Ultrasonic ContactImpedance Method1This standard is issued under the fixed designation A1038;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.1NOTETable 3 heading was corrected editorially in April 2016.1.Scope*1.1 This test method covers the determination of compara-tive hardness values by applying the Ultrasonic ContactImpedance Method(UCI Method).1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsE10 Test Method for Brinell Hardness of Metallic MaterialsE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE140 Hardness Conversion Tables for Metals RelationshipAmong Brinell Hardness,Vickers Hardness,RockwellHardness,Superficial Hardness,Knoop Hardness,Sclero-scope Hardness,and Leeb HardnessE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE384 Test Method for Microindentation Hardness of Mate-rialsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 calibrationdetermination of the specific values ofthe significant operating parameters of the UCI instrument bycomparison with values indicated by a standardized workbenchhardness tester or by a set of certified reference test pieces.3.1.2 surface finishall references to surface finish in thistest method are defined as surface roughness(that is,Ra=average roughness value).3.1.3 UCI hardness testa hardness testing method using acalibrated instrument by pressing a resonating rod with adefined indenter,for example,a Vickers diamond,with a fixedforce against the surface of the part to be tested.3.1.4 UCI methodUltrasonic Contact Impedance,a hard-ness testing method developed by Dr.Claus Kleesattel in 1961based on the measurement of the frequency shift of a resonat-ing rod caused by the essentially elastic nature of the finite areaof contact between the indenter and the test piece during thepenetration.3.1.5 verificationchecking or testing the UCI instrumentto ensure conformance with this test method.4.Significance and Use4.1 The hardness of a material is a defined quantity havingmany scales and being dependent on the way the test isperformed.In order to avoid the creation of a new methodinvolving a new hardness scale,the UCI method converts intocommon hardness values,for example,HV,HRC,etc.4.2 The UCI hardness test is a superficial determination,only measuring the hardness condition of the surface con-tacted.The results generated at a specific location do notrepresent the part at any other surface location and yield noinformation about the material at subsurface locations.4.3 The UCI hardness test may be used on large or smallcomponents at various locations.It can be used to makehardness measurements on positions difficult to access,such astooth flanks or roots of gears.1This test method 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 Nov.1,2013.Published March 2014.Originallyapproved in 2005.Last previous edition approved in 2010 as A1038 10a.DOI:10.1520/A1038-13E01.2For 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 A.GENERAL DESCRIPTION OF INSTRUMENTSAND TEST PROCEDURE FOR UCI HARDNESSTESTING5.Apparatus5.1 Instruments used for UCI hardness testing generallyconsist of(1)a probe containing a rod with a defined indenter,for example,a Vickers diamond,attached to the contacting endper Test Method E384(see Fig.1),(2)vibration generatingmeans,(3)vibration detecting means,(4)electronic means forthe numerical evaluation,and(5)a digital display,indicatingthe measured hardness number.5.2 UCI ProbesThere are different probes available forUCI hardness testing.They typically cover static loads rangingfrom 1 N to 98 N.See also Appendix X1.They come also indifferent sizes with longer and shorte