ASTM_G_129_-_00_2013.pdf

Designation:G12900(Reapproved 2013)Standard Practice forSlow Strain Rate Testing to Evaluate the Susceptibility ofMetallic Materials to Environmentally Assisted Cracking1This standard is issued under the fixed designation G129;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 practice covers procedures for the design,preparation,and use of axially loaded,tension test specimensand fatigue pre-cracked(fracture mechanics)specimens for usein slow strain rate(SSR)tests to investigate the resistance ofmetallic materials to environmentally assisted cracking(EAC).While some investigators utilize SSR test techniques in com-bination with cyclic or fatigue loading,no attempt has beenmade to incorporate such techniques into this practice.1.2 Slow strain rate testing is applicable to the evaluation ofa wide variety of metallic materials in test environments whichsimulate aqueous,nonaqueous,and gaseous service environ-ments over a wide range of temperatures and pressures thatmay cause EAC of susceptible materials.1.3 The primary use of this practice is to furnish acceptedprocedures for the accelerated testing of the resistance ofmetallic materials to EAC under various environmental condi-tions.In many cases,the initiation of EAC is acceleratedthrough the application of a dynamic strain in the gauge sectionor at a notch tip or crack tip,or both,of a specimen.Due to theaccelerated nature of this test,the results are not intended tonecessarily represent service performance,but rather to pro-vide a basis for screening,for detection of an environmentalinteraction with a material,and for comparative evaluation ofthe effects of metallurgical and environmental variables onsensitivity to known environmental cracking problems.1.4 Further information on SSR test methods is available inISO 7539 and in the references provided with this practice(1-6).21.5 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.6 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.Furthermore,insome cases,special facilities will be required to isolate thesetests from laboratory personnel if high pressures or toxicchemical environments,or both,are utilized in SSR testing.2.Referenced Documents2.1 ASTM Standards:3A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsB557 Test Methods for Tension Testing Wrought and CastAluminum-and Magnesium-Alloy ProductsD1193 Specification for Reagent WaterE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE8 Test Methods for Tension Testing of Metallic MaterialsE399 Test Method for Linear-Elastic Plane-Strain FractureToughness KIcof Metallic MaterialsE602 Test Method for Sharp-Notch Tension Testing withCylindrical Specimens(Withdrawn 2010)4E616 Terminology Relating to Fracture Testing(Discontin-ued 1996)(Withdrawn 1996)4E647 Test Method for Measurement of Fatigue CrackGrowth RatesE1681 Test Method for Determining Threshold Stress Inten-sity Factor for Environment-Assisted Cracking of MetallicMaterialsG15 Terminology Relating to Corrosion and Corrosion Test-ing(Withdrawn 2010)4G49 Practice for Preparation and Use of Direct TensionStress-Corrosion Test SpecimensG111 Guide for Corrosion Tests in High Temperature orHigh Pressure Environment,or Both1This practice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.06 on Environmen-tally Assisted Cracking.Current edition approved May 1,2013.Published July 2013.Originally approvedin 1995.Last previous edition approved in 2006 as G129 00(2006).DOI:10.1520/G0129-00R13.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For 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.4The 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 G142 Test Method for Determination of Susceptibility ofMetals to Embrittlement in Hydrogen Containing Envi-ronments at High Pressure,High Temperature,or Both2.2 ISO Standard:5ISO 7539 Part 7,Slow Strain Rate Testing3.Terminology3.1 For purposes of this practice the following terms aredefined:3.2 control environmentan