ASTM_A_1033_-_10_2015.pdf

Designation:A103310(Reapproved 2015)Standard Practice forQuantitative Measurement and Reporting of HypoeutectoidCarbon and Low-Alloy Steel Phase Transformations1This standard is issued under the fixed designation A1033;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.Scope*1.1 This practice covers the determination of hypoeutectoidsteel phase transformation behavior by using high-speeddilatometry techniques for measuring linear dimensionalchange as a function of time and temperature,and reporting theresults as linear strain in either a numerical or graphical format.1.2 The practice is applicable to high-speed dilatometryequipment capable of programmable thermal profiles and withdigital data storage and output capability.1.3 This practice is applicable to the determination of steelphase transformation behavior under both isothermal andcontinuous cooling conditions.1.4 This practice includes requirements for obtaining met-allographic information to be used as a supplement to thedilatometry measurements.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.2.Referenced Documents2.1 ASTM Standards:2E3 Guide for Preparation of Metallographic SpecimensE112 Test Methods for Determining Average Grain SizeE407 Practice for Microetching Metals and Alloys3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 diametrical linear engineering strainthe strain,ei-ther thermal or resulting from phase transformation,that isdetermined from a change in diameter as a result of a changein temperature,or over a period of time,and which is expressedas follows:eD5 d/d05d12 d0!/d03.1.2 hypoeutectoid steela term used to describe a groupof carbon steels with a carbon content less than the eutectoidcomposition(0.8%by weight).3.1.3 longitudinal linear engineering strainthe strain,ei-ther thermal or resulting from phase transformation,that isdetermined from a change in length as a result of a change intemperature,or over a period of time,and which is expressedas follows:eL5 l/L05l12 l0!/l03.1.4 steel phase transformationduring heating,the crys-tallographic transformation from ferrite,pearlite,bainite,mar-tensite or combinations of these constituents to austenite.During cooling,the crystallographic transformation from aus-tenite to ferrite,pearlite,bainite,or martensite or a combinationthereof.3.1.5 volumetric engineering strainthe strain,either ther-mal or resulting from phase transformation,that is determinedfrom a change in volume as a result of a change in temperature,or over a period of time,and which is expressed as follows:eV5 v/v05v12 v0!/v0eV3eL3eD3.2 Symbols:eL=longitudinal linear engineering straineD=diametrical linear engineering straineV=volumetric engineering strainl=change in test specimen lengthl1=test specimen length at specific temperature or time,orbothl0=initial test specimen lengthd=change in test specimen diameterd1=test specimen diameter at specific temperature or time,or both1This practice is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.13 on Mechanical and Chemical Testing and Processing Methods of SteelProducts and Processes.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 2004.Last previous edition approved in 2010 as A1033 10.DOI:10.1520/A1033-10R15.2For 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 d0=initial test specimen diameterv=change in test specimen volumev1=test specimen volume at a specific temperature or time,or bothv0=initial test specimen volumeAc1=the temperature at which austenite begins to form onheatingAc3=the temperature at which the transformation of ferriteto austenite is complete on heatingMs=the temperature at which the transformation of austen-ite to martensite starts during cooling4.Summary of Practice4.1 This practice is based upon the principle that,duringheating and cooling of steels,dimensional changes occur as aresult of both thermal expansion associated with temperaturechange and phase transformation.In t