ASTM_B_577_-_16.pdf

Designation:B57716Standard Test Methods forDetection of Cuprous Oxide(Hydrogen EmbrittlementSusceptibility)in Copper1This standard is issued under the fixed designation B577;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 These test methods describe procedures for determiningthe presence of cuprous oxide(Cu2O)in products made fromdeoxidized and oxygen-free copper.1.2 The test methods appear in the following order:SectionsMicroscopical Examination without Thermal Treatment9 11Microscopical Examination after Thermal Treatment13 15Closed Bend Test after Thermal Treatment17 19Reverse Bend Test after Thermal Treatment21 231.3 UnitsThe values stated in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.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:2E3 Guide for Preparation of Metallographic SpecimensE883 Guide for ReflectedLight Photomicrography3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 deoxidized coppermaterial produced substantiallyfree of cuprous oxide,by the use of metallic or metalloidaldeoxidizers,as determined by metallographic examination at75 under polarized light.Oxygen may be present as residualdeoxidation products.3.1.2 oxygen-free copperelectrolytic copper producedsubstantially free of cuprous oxide without the use of metallicor metalloidal deoxidizers as determined by metallographicexamination at 75 under polarized light.Oxygen may bepresent up to a maximum of 5 ppm in Copper UNS No.C10100 and 10 ppm in Copper UNS No.C10200.4.Summary of Test Methods4.1 The presence of cuprous oxide is determined either bymicroscopical examination under polarized light or by methodsthat involve heating the test specimens in a hydrogen-richatmosphere and rapidly cooling the specimens without undueexposure to air followed by a microscopical examination or asuitable bend test.5.Significance and Use5.1 These test methods determine whether copper productswill be resistant to embrittlement when exposed to elevatedtemperatures in a reducing atmosphere.5.1.1 It is assumed that all who use these test methods willbe trained personnel capable of performing these proceduresskillfully and safely.It is expected that work will be performedin a properly equipped facility.6.Apparatus6.1 Test Method AMetallographic equipment of the typedescribed in Guide E3 and Guide E883 suitably equipped witha polarized light illuminating device.6.2 Test Methods B,C,and D:6.2.1 Metallographic equipment of the type described inGuide E3 and Guide E883 provided with normal illumination.6.2.2 A furnace of sufficient capacity,capable of maintain-ing the required reducing atmosphere while the specimens arebeing heated.A rapid cooling device using either water or areducing atmosphere is required.6.2.3 A machinist vise with replaceable matching pairs ofjaw mandrels of various radii contours.1These test methods are under the jurisdiction of ASTM Committee B05 onCopper and Copper Alloys and is the direct responsibility of Subcommittee B05.06on Methods of Test.Current edition approved April 1,2016.Published April 2016.Originallyapproved in 1973.Last previous edition approved in 2010 as B577 10.DOI:10.1520/B0577-16.2For 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.Sampling7.1 Sampling shall be in accordance with the requirementsof the specification under which the material was ordered.8.Test Specimens8.1 Longitudinal specimens,that is,specimens whose axesare parallel to the direction of working are preferable.However,equally reliable results can be obtained with speci-mens in which the axis is perpendicular to the directions ofworking.8.2 Specimens shall be of dimensions suitable for theperformance of the required tests.Where necessary to cut aspecimen from an oversize piece of material,at least one of theoriginal surfaces of the material shall be retained in the testspecimen.Suggested dimensions for test specimens for Proce-dures C or D